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   1  YUI.add('yui2-dom', function(Y) {
   2      var YAHOO    = Y.YUI2;
   3      /*
   4  Copyright (c) 2011, Yahoo! Inc. All rights reserved.
   5  Code licensed under the BSD License:
   6  http://developer.yahoo.com/yui/license.html
   7  version: 2.9.0
   8  */
   9  /**
  10   * The dom module provides helper methods for manipulating Dom elements.
  11   * @module dom
  12   *
  13   */
  14  
  15  (function() {
  16      // for use with generateId (global to save state if Dom is overwritten)
  17      YAHOO.env._id_counter = YAHOO.env._id_counter || 0;
  18  
  19      // internal shorthand
  20      var Y = YAHOO.util,
  21          lang = YAHOO.lang,
  22          UA = YAHOO.env.ua,
  23          trim = YAHOO.lang.trim,
  24          propertyCache = {}, // for faster hyphen converts
  25          reCache = {}, // cache className regexes
  26          RE_TABLE = /^t(?:able|d|h)$/i, // for _calcBorders
  27          RE_COLOR = /color$/i,
  28  
  29          // DOM aliases 
  30          document = window.document,     
  31          documentElement = document.documentElement,
  32  
  33          // string constants
  34          OWNER_DOCUMENT = 'ownerDocument',
  35          DEFAULT_VIEW = 'defaultView',
  36          DOCUMENT_ELEMENT = 'documentElement',
  37          COMPAT_MODE = 'compatMode',
  38          OFFSET_LEFT = 'offsetLeft',
  39          OFFSET_TOP = 'offsetTop',
  40          OFFSET_PARENT = 'offsetParent',
  41          PARENT_NODE = 'parentNode',
  42          NODE_TYPE = 'nodeType',
  43          TAG_NAME = 'tagName',
  44          SCROLL_LEFT = 'scrollLeft',
  45          SCROLL_TOP = 'scrollTop',
  46          GET_BOUNDING_CLIENT_RECT = 'getBoundingClientRect',
  47          GET_COMPUTED_STYLE = 'getComputedStyle',
  48          CURRENT_STYLE = 'currentStyle',
  49          CSS1_COMPAT = 'CSS1Compat',
  50          _BACK_COMPAT = 'BackCompat',
  51          _CLASS = 'class', // underscore due to reserved word
  52          CLASS_NAME = 'className',
  53          EMPTY = '',
  54          SPACE = ' ',
  55          C_START = '(?:^|\\s)',
  56          C_END = '(?= |$)',
  57          G = 'g',
  58          POSITION = 'position',
  59          FIXED = 'fixed',
  60          RELATIVE = 'relative',
  61          LEFT = 'left',
  62          TOP = 'top',
  63          MEDIUM = 'medium',
  64          BORDER_LEFT_WIDTH = 'borderLeftWidth',
  65          BORDER_TOP_WIDTH = 'borderTopWidth',
  66      
  67      // brower detection
  68          isOpera = UA.opera,
  69          isSafari = UA.webkit, 
  70          isGecko = UA.gecko, 
  71          isIE = UA.ie; 
  72      
  73      /**
  74       * Provides helper methods for DOM elements.
  75       * @namespace YAHOO.util
  76       * @class Dom
  77       * @requires yahoo, event
  78       */
  79      Y.Dom = {
  80          CUSTOM_ATTRIBUTES: (!documentElement.hasAttribute) ? { // IE < 8
  81              'for': 'htmlFor',
  82              'class': CLASS_NAME
  83          } : { // w3c
  84              'htmlFor': 'for',
  85              'className': _CLASS
  86          },
  87  
  88          DOT_ATTRIBUTES: {
  89              checked: true 
  90          },
  91  
  92          /**
  93           * Returns an HTMLElement reference.
  94           * @method get
  95           * @param {String | HTMLElement |Array} el Accepts a string to use as an ID for getting a DOM reference, an actual DOM reference, or an Array of IDs and/or HTMLElements.
  96           * @return {HTMLElement | Array} A DOM reference to an HTML element or an array of HTMLElements.
  97           */
  98          get: function(el) {
  99              var id, nodes, c, i, len, attr, ret = null;
 100  
 101              if (el) {
 102                  if (typeof el == 'string' || typeof el == 'number') { // id
 103                      id = el + '';
 104                      el = document.getElementById(el);
 105                      attr = (el) ? el.attributes : null;
 106                      if (el && attr && attr.id && attr.id.value === id) { // IE: avoid false match on "name" attribute
 107                          return el;
 108                      } else if (el && document.all) { // filter by name
 109                          el = null;
 110                          nodes = document.all[id];
 111                          if (nodes && nodes.length) {
 112                              for (i = 0, len = nodes.length; i < len; ++i) {
 113                                  if (nodes[i].id === id) {
 114                                      return nodes[i];
 115                                  }
 116                              }
 117                          }
 118                      }
 119                  } else if (Y.Element && el instanceof Y.Element) {
 120                      el = el.get('element');
 121                  } else if (!el.nodeType && 'length' in el) { // array-like 
 122                      c = [];
 123                      for (i = 0, len = el.length; i < len; ++i) {
 124                          c[c.length] = Y.Dom.get(el[i]);
 125                      }
 126                      
 127                      el = c;
 128                  }
 129  
 130                  ret = el;
 131              }
 132  
 133              return ret;
 134          },
 135      
 136          getComputedStyle: function(el, property) {
 137              if (window[GET_COMPUTED_STYLE]) {
 138                  return el[OWNER_DOCUMENT][DEFAULT_VIEW][GET_COMPUTED_STYLE](el, null)[property];
 139              } else if (el[CURRENT_STYLE]) {
 140                  return Y.Dom.IE_ComputedStyle.get(el, property);
 141              }
 142          },
 143  
 144          /**
 145           * Normalizes currentStyle and ComputedStyle.
 146           * @method getStyle
 147           * @param {String | HTMLElement |Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
 148           * @param {String} property The style property whose value is returned.
 149           * @return {String | Array} The current value of the style property for the element(s).
 150           */
 151          getStyle: function(el, property) {
 152              return Y.Dom.batch(el, Y.Dom._getStyle, property);
 153          },
 154  
 155          // branching at load instead of runtime
 156          _getStyle: function() {
 157              if (window[GET_COMPUTED_STYLE]) { // W3C DOM method
 158                  return function(el, property) {
 159                      property = (property === 'float') ? property = 'cssFloat' :
 160                              Y.Dom._toCamel(property);
 161  
 162                      var value = el.style[property],
 163                          computed;
 164                      
 165                      if (!value) {
 166                          computed = el[OWNER_DOCUMENT][DEFAULT_VIEW][GET_COMPUTED_STYLE](el, null);
 167                          if (computed) { // test computed before touching for safari
 168                              value = computed[property];
 169                          }
 170                      }
 171                      
 172                      return value;
 173                  };
 174              } else if (documentElement[CURRENT_STYLE]) {
 175                  return function(el, property) {                         
 176                      var value;
 177  
 178                      switch(property) {
 179                          case 'opacity' :// IE opacity uses filter
 180                              value = 100;
 181                              try { // will error if no DXImageTransform
 182                                  value = el.filters['DXImageTransform.Microsoft.Alpha'].opacity;
 183  
 184                              } catch(e) {
 185                                  try { // make sure its in the document
 186                                      value = el.filters('alpha').opacity;
 187                                  } catch(err) {
 188                                      YAHOO.log('getStyle: IE filter failed',
 189                                              'error', 'Dom');
 190                                  }
 191                              }
 192                              return value / 100;
 193                          case 'float': // fix reserved word
 194                              property = 'styleFloat'; // fall through
 195                          default: 
 196                              property = Y.Dom._toCamel(property);
 197                              value = el[CURRENT_STYLE] ? el[CURRENT_STYLE][property] : null;
 198                              return ( el.style[property] || value );
 199                      }
 200                  };
 201              }
 202          }(),
 203      
 204          /**
 205           * Wrapper for setting style properties of HTMLElements.  Normalizes "opacity" across modern browsers.
 206           * @method setStyle
 207           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
 208           * @param {String} property The style property to be set.
 209           * @param {String} val The value to apply to the given property.
 210           */
 211          setStyle: function(el, property, val) {
 212              Y.Dom.batch(el, Y.Dom._setStyle, { prop: property, val: val });
 213          },
 214  
 215          _setStyle: function() {
 216              if (!window.getComputedStyle && document.documentElement.currentStyle) {
 217                  return function(el, args) {
 218                      var property = Y.Dom._toCamel(args.prop),
 219                          val = args.val;
 220  
 221                      if (el) {
 222                          switch (property) {
 223                              case 'opacity':
 224                                  // remove filter if unsetting or full opacity
 225                                  if (val === '' || val === null || val === 1) {
 226                                      el.style.removeAttribute('filter');
 227                                  } else if ( lang.isString(el.style.filter) ) { // in case not appended
 228                                      el.style.filter = 'alpha(opacity=' + val * 100 + ')';
 229                                      
 230                                      if (!el[CURRENT_STYLE] || !el[CURRENT_STYLE].hasLayout) {
 231                                          el.style.zoom = 1; // when no layout or cant tell
 232                                      }
 233                                  }
 234                                  break;
 235                              case 'float':
 236                                  property = 'styleFloat';
 237                              default:
 238                              el.style[property] = val;
 239                          }
 240                      } else {
 241                          YAHOO.log('element ' + el + ' is undefined', 'error', 'Dom');
 242                      }
 243                  };
 244              } else {
 245                  return function(el, args) {
 246                      var property = Y.Dom._toCamel(args.prop),
 247                          val = args.val;
 248                      if (el) {
 249                          if (property == 'float') {
 250                              property = 'cssFloat';
 251                          }
 252                          el.style[property] = val;
 253                      } else {
 254                          YAHOO.log('element ' + el + ' is undefined', 'error', 'Dom');
 255                      }
 256                  };
 257              }
 258  
 259          }(),
 260          
 261          /**
 262           * Gets the current position of an element based on page coordinates. 
 263           * Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
 264           * @method getXY
 265           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM
 266           * reference, or an Array of IDs and/or HTMLElements
 267           * @return {Array} The XY position of the element(s)
 268           */
 269          getXY: function(el) {
 270              return Y.Dom.batch(el, Y.Dom._getXY);
 271          },
 272  
 273          _canPosition: function(el) {
 274              return ( Y.Dom._getStyle(el, 'display') !== 'none' && Y.Dom._inDoc(el) );
 275          },
 276  
 277          _getXY: function(node) {
 278              var scrollLeft, scrollTop, box, doc,
 279                  clientTop, clientLeft,
 280                  round = Math.round, // TODO: round?
 281                  xy = false;
 282  
 283              if (Y.Dom._canPosition(node)) {
 284                  box = node[GET_BOUNDING_CLIENT_RECT]();
 285                  doc = node[OWNER_DOCUMENT];
 286                  scrollLeft = Y.Dom.getDocumentScrollLeft(doc);
 287                  scrollTop = Y.Dom.getDocumentScrollTop(doc);
 288                  xy = [box[LEFT], box[TOP]];
 289  
 290                  // remove IE default documentElement offset (border)
 291                  if (clientTop || clientLeft) {
 292                      xy[0] -= clientLeft;
 293                      xy[1] -= clientTop;
 294                  }
 295  
 296                  if ((scrollTop || scrollLeft)) {
 297                      xy[0] += scrollLeft;
 298                      xy[1] += scrollTop;
 299                  }
 300  
 301                  // gecko may return sub-pixel (non-int) values
 302                  xy[0] = round(xy[0]);
 303                  xy[1] = round(xy[1]);
 304              } else {
 305                  YAHOO.log('getXY failed: element not positionable (either not in a document or not displayed)', 'error', 'Dom');
 306              }
 307  
 308              return xy;
 309          },
 310          
 311          /**
 312           * Gets the current X position of an element based on page coordinates.  The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
 313           * @method getX
 314           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
 315           * @return {Number | Array} The X position of the element(s)
 316           */
 317          getX: function(el) {
 318              var f = function(el) {
 319                  return Y.Dom.getXY(el)[0];
 320              };
 321              
 322              return Y.Dom.batch(el, f, Y.Dom, true);
 323          },
 324          
 325          /**
 326           * Gets the current Y position of an element based on page coordinates.  Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
 327           * @method getY
 328           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
 329           * @return {Number | Array} The Y position of the element(s)
 330           */
 331          getY: function(el) {
 332              var f = function(el) {
 333                  return Y.Dom.getXY(el)[1];
 334              };
 335              
 336              return Y.Dom.batch(el, f, Y.Dom, true);
 337          },
 338          
 339          /**
 340           * Set the position of an html element in page coordinates, regardless of how the element is positioned.
 341           * The element(s) must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
 342           * @method setXY
 343           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
 344           * @param {Array} pos Contains X & Y values for new position (coordinates are page-based)
 345           * @param {Boolean} noRetry By default we try and set the position a second time if the first fails
 346           */
 347          setXY: function(el, pos, noRetry) {
 348              Y.Dom.batch(el, Y.Dom._setXY, { pos: pos, noRetry: noRetry });
 349          },
 350  
 351          _setXY: function(node, args) {
 352              var pos = Y.Dom._getStyle(node, POSITION),
 353                  setStyle = Y.Dom.setStyle,
 354                  xy = args.pos,
 355                  noRetry = args.noRetry,
 356  
 357                  delta = [ // assuming pixels; if not we will have to retry
 358                      parseInt( Y.Dom.getComputedStyle(node, LEFT), 10 ),
 359                      parseInt( Y.Dom.getComputedStyle(node, TOP), 10 )
 360                  ],
 361  
 362                  currentXY,
 363                  newXY;
 364          
 365              currentXY = Y.Dom._getXY(node);
 366  
 367              if (!xy || currentXY === false) { // has to be part of doc to have xy
 368                  YAHOO.log('xy failed: node not available', 'error', 'Node');
 369                  return false; 
 370              }
 371              
 372              if (pos == 'static') { // default to relative
 373                  pos = RELATIVE;
 374                  setStyle(node, POSITION, pos);
 375              }
 376  
 377              if ( isNaN(delta[0]) ) {// in case of 'auto'
 378                  delta[0] = (pos == RELATIVE) ? 0 : node[OFFSET_LEFT];
 379              } 
 380              if ( isNaN(delta[1]) ) { // in case of 'auto'
 381                  delta[1] = (pos == RELATIVE) ? 0 : node[OFFSET_TOP];
 382              } 
 383  
 384              if (xy[0] !== null) { // from setX
 385                  setStyle(node, LEFT, xy[0] - currentXY[0] + delta[0] + 'px');
 386              }
 387  
 388              if (xy[1] !== null) { // from setY
 389                  setStyle(node, TOP, xy[1] - currentXY[1] + delta[1] + 'px');
 390              }
 391            
 392              if (!noRetry) {
 393                  newXY = Y.Dom._getXY(node);
 394  
 395                  // if retry is true, try one more time if we miss 
 396                 if ( (xy[0] !== null && newXY[0] != xy[0]) || 
 397                      (xy[1] !== null && newXY[1] != xy[1]) ) {
 398                     Y.Dom._setXY(node, { pos: xy, noRetry: true });
 399                 }
 400              }        
 401  
 402              YAHOO.log('setXY setting position to ' + xy, 'info', 'Node');
 403          },
 404          
 405          /**
 406           * Set the X position of an html element in page coordinates, regardless of how the element is positioned.
 407           * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
 408           * @method setX
 409           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
 410           * @param {Int} x The value to use as the X coordinate for the element(s).
 411           */
 412          setX: function(el, x) {
 413              Y.Dom.setXY(el, [x, null]);
 414          },
 415          
 416          /**
 417           * Set the Y position of an html element in page coordinates, regardless of how the element is positioned.
 418           * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
 419           * @method setY
 420           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
 421           * @param {Int} x To use as the Y coordinate for the element(s).
 422           */
 423          setY: function(el, y) {
 424              Y.Dom.setXY(el, [null, y]);
 425          },
 426          
 427          /**
 428           * Returns the region position of the given element.
 429           * The element must be part of the DOM tree to have a region (display:none or elements not appended return false).
 430           * @method getRegion
 431           * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
 432           * @return {Region | Array} A Region or array of Region instances containing "top, left, bottom, right" member data.
 433           */
 434          getRegion: function(el) {
 435              var f = function(el) {
 436                  var region = false;
 437                  if ( Y.Dom._canPosition(el) ) {
 438                      region = Y.Region.getRegion(el);
 439                      YAHOO.log('getRegion returning ' + region, 'info', 'Dom');
 440                  } else {
 441                      YAHOO.log('getRegion failed: element not positionable (either not in a document or not displayed)', 'error', 'Dom');
 442                  }
 443  
 444                  return region;
 445              };
 446              
 447              return Y.Dom.batch(el, f, Y.Dom, true);
 448          },
 449          
 450          /**
 451           * Returns the width of the client (viewport).
 452           * @method getClientWidth
 453           * @deprecated Now using getViewportWidth.  This interface left intact for back compat.
 454           * @return {Int} The width of the viewable area of the page.
 455           */
 456          getClientWidth: function() {
 457              return Y.Dom.getViewportWidth();
 458          },
 459          
 460          /**
 461           * Returns the height of the client (viewport).
 462           * @method getClientHeight
 463           * @deprecated Now using getViewportHeight.  This interface left intact for back compat.
 464           * @return {Int} The height of the viewable area of the page.
 465           */
 466          getClientHeight: function() {
 467              return Y.Dom.getViewportHeight();
 468          },
 469  
 470          /**
 471           * Returns an array of HTMLElements with the given class.
 472           * For optimized performance, include a tag and/or root node when possible.
 473           * Note: This method operates against a live collection, so modifying the 
 474           * collection in the callback (removing/appending nodes, etc.) will have
 475           * side effects.  Instead you should iterate the returned nodes array,
 476           * as you would with the native "getElementsByTagName" method. 
 477           * @method getElementsByClassName
 478           * @param {String} className The class name to match against
 479           * @param {String} tag (optional) The tag name of the elements being collected
 480           * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point.
 481           * This element is not included in the className scan.
 482           * @param {Function} apply (optional) A function to apply to each element when found 
 483           * @param {Any} o (optional) An optional arg that is passed to the supplied method
 484           * @param {Boolean} overrides (optional) Whether or not to override the scope of "method" with "o"
 485           * @return {Array} An array of elements that have the given class name
 486           */
 487          getElementsByClassName: function(className, tag, root, apply, o, overrides) {
 488              tag = tag || '*';
 489              root = (root) ? Y.Dom.get(root) : null || document; 
 490              if (!root) {
 491                  return [];
 492              }
 493  
 494              var nodes = [],
 495                  elements = root.getElementsByTagName(tag),
 496                  hasClass = Y.Dom.hasClass;
 497  
 498              for (var i = 0, len = elements.length; i < len; ++i) {
 499                  if ( hasClass(elements[i], className) ) {
 500                      nodes[nodes.length] = elements[i];
 501                  }
 502              }
 503              
 504              if (apply) {
 505                  Y.Dom.batch(nodes, apply, o, overrides);
 506              }
 507  
 508              return nodes;
 509          },
 510  
 511          /**
 512           * Determines whether an HTMLElement has the given className.
 513           * @method hasClass
 514           * @param {String | HTMLElement | Array} el The element or collection to test
 515           * @param {String | RegExp} className the class name to search for, or a regular
 516           * expression to match against
 517           * @return {Boolean | Array} A boolean value or array of boolean values
 518           */
 519          hasClass: function(el, className) {
 520              return Y.Dom.batch(el, Y.Dom._hasClass, className);
 521          },
 522  
 523          _hasClass: function(el, className) {
 524              var ret = false,
 525                  current;
 526              
 527              if (el && className) {
 528                  current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
 529                  if (current) { // convert line breaks, tabs and other delims to spaces
 530                      current = current.replace(/\s+/g, SPACE);
 531                  }
 532  
 533                  if (className.exec) {
 534                      ret = className.test(current);
 535                  } else {
 536                      ret = className && (SPACE + current + SPACE).
 537                          indexOf(SPACE + className + SPACE) > -1;
 538                  }
 539              } else {
 540                  YAHOO.log('hasClass called with invalid arguments', 'warn', 'Dom');
 541              }
 542  
 543              return ret;
 544          },
 545      
 546          /**
 547           * Adds a class name to a given element or collection of elements.
 548           * @method addClass         
 549           * @param {String | HTMLElement | Array} el The element or collection to add the class to
 550           * @param {String} className the class name to add to the class attribute
 551           * @return {Boolean | Array} A pass/fail boolean or array of booleans
 552           */
 553          addClass: function(el, className) {
 554              return Y.Dom.batch(el, Y.Dom._addClass, className);
 555          },
 556  
 557          _addClass: function(el, className) {
 558              var ret = false,
 559                  current;
 560  
 561              if (el && className) {
 562                  current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
 563                  if ( !Y.Dom._hasClass(el, className) ) {
 564                      Y.Dom.setAttribute(el, CLASS_NAME, trim(current + SPACE + className));
 565                      ret = true;
 566                  }
 567              } else {
 568                  YAHOO.log('addClass called with invalid arguments', 'warn', 'Dom');
 569              }
 570  
 571              return ret;
 572          },
 573      
 574          /**
 575           * Removes a class name from a given element or collection of elements.
 576           * @method removeClass         
 577           * @param {String | HTMLElement | Array} el The element or collection to remove the class from
 578           * @param {String} className the class name to remove from the class attribute
 579           * @return {Boolean | Array} A pass/fail boolean or array of booleans
 580           */
 581          removeClass: function(el, className) {
 582              return Y.Dom.batch(el, Y.Dom._removeClass, className);
 583          },
 584          
 585          _removeClass: function(el, className) {
 586              var ret = false,
 587                  current,
 588                  newClass,
 589                  attr;
 590  
 591              if (el && className) {
 592                  current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
 593                  Y.Dom.setAttribute(el, CLASS_NAME, current.replace(Y.Dom._getClassRegex(className), EMPTY));
 594  
 595                  newClass = Y.Dom._getAttribute(el, CLASS_NAME);
 596                  if (current !== newClass) { // else nothing changed
 597                      Y.Dom.setAttribute(el, CLASS_NAME, trim(newClass)); // trim after comparing to current class
 598                      ret = true;
 599  
 600                      if (Y.Dom._getAttribute(el, CLASS_NAME) === '') { // remove class attribute if empty
 601                          attr = (el.hasAttribute && el.hasAttribute(_CLASS)) ? _CLASS : CLASS_NAME;
 602                          YAHOO.log('removeClass removing empty class attribute', 'info', 'Dom');
 603                          el.removeAttribute(attr);
 604                      }
 605                  }
 606  
 607              } else {
 608                  YAHOO.log('removeClass called with invalid arguments', 'warn', 'Dom');
 609              }
 610  
 611              return ret;
 612          },
 613          
 614          /**
 615           * Replace a class with another class for a given element or collection of elements.
 616           * If no oldClassName is present, the newClassName is simply added.
 617           * @method replaceClass  
 618           * @param {String | HTMLElement | Array} el The element or collection to remove the class from
 619           * @param {String} oldClassName the class name to be replaced
 620           * @param {String} newClassName the class name that will be replacing the old class name
 621           * @return {Boolean | Array} A pass/fail boolean or array of booleans
 622           */
 623          replaceClass: function(el, oldClassName, newClassName) {
 624              return Y.Dom.batch(el, Y.Dom._replaceClass, { from: oldClassName, to: newClassName });
 625          },
 626  
 627          _replaceClass: function(el, classObj) {
 628              var className,
 629                  from,
 630                  to,
 631                  ret = false,
 632                  current;
 633  
 634              if (el && classObj) {
 635                  from = classObj.from;
 636                  to = classObj.to;
 637  
 638                  if (!to) {
 639                      ret = false;
 640                  }  else if (!from) { // just add if no "from"
 641                      ret = Y.Dom._addClass(el, classObj.to);
 642                  } else if (from !== to) { // else nothing to replace
 643                      // May need to lead with DBLSPACE?
 644                      current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
 645                      className = (SPACE + current.replace(Y.Dom._getClassRegex(from), SPACE + to).
 646                              replace(/\s+/g, SPACE)). // normalize white space
 647                              split(Y.Dom._getClassRegex(to));
 648  
 649                      // insert to into what would have been the first occurrence slot
 650                      className.splice(1, 0, SPACE + to);
 651                      Y.Dom.setAttribute(el, CLASS_NAME, trim(className.join(EMPTY)));
 652                      ret = true;
 653                  }
 654              } else {
 655                  YAHOO.log('replaceClass called with invalid arguments', 'warn', 'Dom');
 656              }
 657  
 658              return ret;
 659          },
 660          
 661          /**
 662           * Returns an ID and applies it to the element "el", if provided.
 663           * @method generateId  
 664           * @param {String | HTMLElement | Array} el (optional) An optional element array of elements to add an ID to (no ID is added if one is already present).
 665           * @param {String} prefix (optional) an optional prefix to use (defaults to "yui-gen").
 666           * @return {String | Array} The generated ID, or array of generated IDs (or original ID if already present on an element)
 667           */
 668          generateId: function(el, prefix) {
 669              prefix = prefix || 'yui-gen';
 670  
 671              var f = function(el) {
 672                  if (el && el.id) { // do not override existing ID
 673                      YAHOO.log('generateId returning existing id ' + el.id, 'info', 'Dom');
 674                      return el.id;
 675                  }
 676  
 677                  var id = prefix + YAHOO.env._id_counter++;
 678                  YAHOO.log('generateId generating ' + id, 'info', 'Dom');
 679  
 680                  if (el) {
 681                      if (el[OWNER_DOCUMENT] && el[OWNER_DOCUMENT].getElementById(id)) { // in case one already exists
 682                          // use failed id plus prefix to help ensure uniqueness
 683                          return Y.Dom.generateId(el, id + prefix);
 684                      }
 685                      el.id = id;
 686                  }
 687                  
 688                  return id;
 689              };
 690  
 691              // batch fails when no element, so just generate and return single ID
 692              return Y.Dom.batch(el, f, Y.Dom, true) || f.apply(Y.Dom, arguments);
 693          },
 694          
 695          /**
 696           * Determines whether an HTMLElement is an ancestor of another HTML element in the DOM hierarchy.
 697           * @method isAncestor
 698           * @param {String | HTMLElement} haystack The possible ancestor
 699           * @param {String | HTMLElement} needle The possible descendent
 700           * @return {Boolean} Whether or not the haystack is an ancestor of needle
 701           */
 702          isAncestor: function(haystack, needle) {
 703              haystack = Y.Dom.get(haystack);
 704              needle = Y.Dom.get(needle);
 705              
 706              var ret = false;
 707  
 708              if ( (haystack && needle) && (haystack[NODE_TYPE] && needle[NODE_TYPE]) ) {
 709                  if (haystack.contains && haystack !== needle) { // contains returns true when equal
 710                      ret = haystack.contains(needle);
 711                  }
 712                  else if (haystack.compareDocumentPosition) { // gecko
 713                      ret = !!(haystack.compareDocumentPosition(needle) & 16);
 714                  }
 715              } else {
 716                  YAHOO.log('isAncestor failed; invalid input: ' + haystack + ',' + needle, 'error', 'Dom');
 717              }
 718              YAHOO.log('isAncestor(' + haystack + ',' + needle + ' returning ' + ret, 'info', 'Dom');
 719              return ret;
 720          },
 721          
 722          /**
 723           * Determines whether an HTMLElement is present in the current document.
 724           * @method inDocument         
 725           * @param {String | HTMLElement} el The element to search for
 726           * @param {Object} doc An optional document to search, defaults to element's owner document 
 727           * @return {Boolean} Whether or not the element is present in the current document
 728           */
 729          inDocument: function(el, doc) {
 730              return Y.Dom._inDoc(Y.Dom.get(el), doc);
 731          },
 732  
 733          _inDoc: function(el, doc) {
 734              var ret = false;
 735              if (el && el[TAG_NAME]) {
 736                  doc = doc || el[OWNER_DOCUMENT]; 
 737                  ret = Y.Dom.isAncestor(doc[DOCUMENT_ELEMENT], el);
 738              } else {
 739                  YAHOO.log('inDocument failed: invalid input', 'error', 'Dom');
 740              }
 741              return ret;
 742          },
 743          
 744          /**
 745           * Returns an array of HTMLElements that pass the test applied by supplied boolean method.
 746           * For optimized performance, include a tag and/or root node when possible.
 747           * Note: This method operates against a live collection, so modifying the 
 748           * collection in the callback (removing/appending nodes, etc.) will have
 749           * side effects.  Instead you should iterate the returned nodes array,
 750           * as you would with the native "getElementsByTagName" method. 
 751           * @method getElementsBy
 752           * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
 753           * @param {String} tag (optional) The tag name of the elements being collected
 754           * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point 
 755           * @param {Function} apply (optional) A function to apply to each element when found 
 756           * @param {Any} o (optional) An optional arg that is passed to the supplied method
 757           * @param {Boolean} overrides (optional) Whether or not to override the scope of "method" with "o"
 758           * @return {Array} Array of HTMLElements
 759           */
 760          getElementsBy: function(method, tag, root, apply, o, overrides, firstOnly) {
 761              tag = tag || '*';
 762              root = (root) ? Y.Dom.get(root) : null || document; 
 763  
 764                  var ret = (firstOnly) ? null : [],
 765                      elements;
 766              
 767              // in case Dom.get() returns null
 768              if (root) {
 769                  elements = root.getElementsByTagName(tag);
 770                  for (var i = 0, len = elements.length; i < len; ++i) {
 771                      if ( method(elements[i]) ) {
 772                          if (firstOnly) {
 773                              ret = elements[i]; 
 774                              break;
 775                          } else {
 776                              ret[ret.length] = elements[i];
 777                          }
 778                      }
 779                  }
 780  
 781                  if (apply) {
 782                      Y.Dom.batch(ret, apply, o, overrides);
 783                  }
 784              }
 785  
 786              YAHOO.log('getElementsBy returning ' + ret, 'info', 'Dom');
 787              
 788              return ret;
 789          },
 790          
 791          /**
 792           * Returns the first HTMLElement that passes the test applied by the supplied boolean method.
 793           * @method getElementBy
 794           * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
 795           * @param {String} tag (optional) The tag name of the elements being collected
 796           * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point 
 797           * @return {HTMLElement}
 798           */
 799          getElementBy: function(method, tag, root) {
 800              return Y.Dom.getElementsBy(method, tag, root, null, null, null, true); 
 801          },
 802  
 803          /**
 804           * Runs the supplied method against each item in the Collection/Array.
 805           * The method is called with the element(s) as the first arg, and the optional param as the second ( method(el, o) ).
 806           * @method batch
 807           * @param {String | HTMLElement | Array} el (optional) An element or array of elements to apply the method to
 808           * @param {Function} method The method to apply to the element(s)
 809           * @param {Any} o (optional) An optional arg that is passed to the supplied method
 810           * @param {Boolean} overrides (optional) Whether or not to override the scope of "method" with "o"
 811           * @return {Any | Array} The return value(s) from the supplied method
 812           */
 813          batch: function(el, method, o, overrides) {
 814              var collection = [],
 815                  scope = (overrides) ? o : null;
 816                  
 817              el = (el && (el[TAG_NAME] || el.item)) ? el : Y.Dom.get(el); // skip get() when possible
 818              if (el && method) {
 819                  if (el[TAG_NAME] || el.length === undefined) { // element or not array-like 
 820                      return method.call(scope, el, o);
 821                  } 
 822  
 823                  for (var i = 0; i < el.length; ++i) {
 824                      collection[collection.length] = method.call(scope || el[i], el[i], o);
 825                  }
 826              } else {
 827                  YAHOO.log('batch called with invalid arguments', 'warn', 'Dom');
 828                  return false;
 829              } 
 830              return collection;
 831          },
 832          
 833          /**
 834           * Returns the height of the document.
 835           * @method getDocumentHeight
 836           * @return {Int} The height of the actual document (which includes the body and its margin).
 837           */
 838          getDocumentHeight: function() {
 839              var scrollHeight = (document[COMPAT_MODE] != CSS1_COMPAT || isSafari) ? document.body.scrollHeight : documentElement.scrollHeight,
 840                  h = Math.max(scrollHeight, Y.Dom.getViewportHeight());
 841  
 842              YAHOO.log('getDocumentHeight returning ' + h, 'info', 'Dom');
 843              return h;
 844          },
 845          
 846          /**
 847           * Returns the width of the document.
 848           * @method getDocumentWidth
 849           * @return {Int} The width of the actual document (which includes the body and its margin).
 850           */
 851          getDocumentWidth: function() {
 852              var scrollWidth = (document[COMPAT_MODE] != CSS1_COMPAT || isSafari) ? document.body.scrollWidth : documentElement.scrollWidth,
 853                  w = Math.max(scrollWidth, Y.Dom.getViewportWidth());
 854              YAHOO.log('getDocumentWidth returning ' + w, 'info', 'Dom');
 855              return w;
 856          },
 857  
 858          /**
 859           * Returns the current height of the viewport.
 860           * @method getViewportHeight
 861           * @return {Int} The height of the viewable area of the page (excludes scrollbars).
 862           */
 863          getViewportHeight: function() {
 864              var height = self.innerHeight, // Safari, Opera
 865                  mode = document[COMPAT_MODE];
 866          
 867              if ( (mode || isIE) && !isOpera ) { // IE, Gecko
 868                  height = (mode == CSS1_COMPAT) ?
 869                          documentElement.clientHeight : // Standards
 870                          document.body.clientHeight; // Quirks
 871              }
 872          
 873              YAHOO.log('getViewportHeight returning ' + height, 'info', 'Dom');
 874              return height;
 875          },
 876          
 877          /**
 878           * Returns the current width of the viewport.
 879           * @method getViewportWidth
 880           * @return {Int} The width of the viewable area of the page (excludes scrollbars).
 881           */
 882          
 883          getViewportWidth: function() {
 884              var width = self.innerWidth,  // Safari
 885                  mode = document[COMPAT_MODE];
 886              
 887              if (mode || isIE) { // IE, Gecko, Opera
 888                  width = (mode == CSS1_COMPAT) ?
 889                          documentElement.clientWidth : // Standards
 890                          document.body.clientWidth; // Quirks
 891              }
 892              YAHOO.log('getViewportWidth returning ' + width, 'info', 'Dom');
 893              return width;
 894          },
 895  
 896         /**
 897           * Returns the nearest ancestor that passes the test applied by supplied boolean method.
 898           * For performance reasons, IDs are not accepted and argument validation omitted.
 899           * @method getAncestorBy
 900           * @param {HTMLElement} node The HTMLElement to use as the starting point 
 901           * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
 902           * @return {Object} HTMLElement or null if not found
 903           */
 904          getAncestorBy: function(node, method) {
 905              while ( (node = node[PARENT_NODE]) ) { // NOTE: assignment
 906                  if ( Y.Dom._testElement(node, method) ) {
 907                      YAHOO.log('getAncestorBy returning ' + node, 'info', 'Dom');
 908                      return node;
 909                  }
 910              } 
 911  
 912              YAHOO.log('getAncestorBy returning null (no ancestor passed test)', 'error', 'Dom');
 913              return null;
 914          },
 915          
 916          /**
 917           * Returns the nearest ancestor with the given className.
 918           * @method getAncestorByClassName
 919           * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
 920           * @param {String} className
 921           * @return {Object} HTMLElement
 922           */
 923          getAncestorByClassName: function(node, className) {
 924              node = Y.Dom.get(node);
 925              if (!node) {
 926                  YAHOO.log('getAncestorByClassName failed: invalid node argument', 'error', 'Dom');
 927                  return null;
 928              }
 929              var method = function(el) { return Y.Dom.hasClass(el, className); };
 930              return Y.Dom.getAncestorBy(node, method);
 931          },
 932  
 933          /**
 934           * Returns the nearest ancestor with the given tagName.
 935           * @method getAncestorByTagName
 936           * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
 937           * @param {String} tagName
 938           * @return {Object} HTMLElement
 939           */
 940          getAncestorByTagName: function(node, tagName) {
 941              node = Y.Dom.get(node);
 942              if (!node) {
 943                  YAHOO.log('getAncestorByTagName failed: invalid node argument', 'error', 'Dom');
 944                  return null;
 945              }
 946              var method = function(el) {
 947                   return el[TAG_NAME] && el[TAG_NAME].toUpperCase() == tagName.toUpperCase();
 948              };
 949  
 950              return Y.Dom.getAncestorBy(node, method);
 951          },
 952  
 953          /**
 954           * Returns the previous sibling that is an HTMLElement. 
 955           * For performance reasons, IDs are not accepted and argument validation omitted.
 956           * Returns the nearest HTMLElement sibling if no method provided.
 957           * @method getPreviousSiblingBy
 958           * @param {HTMLElement} node The HTMLElement to use as the starting point 
 959           * @param {Function} method A boolean function used to test siblings
 960           * that receives the sibling node being tested as its only argument
 961           * @return {Object} HTMLElement or null if not found
 962           */
 963          getPreviousSiblingBy: function(node, method) {
 964              while (node) {
 965                  node = node.previousSibling;
 966                  if ( Y.Dom._testElement(node, method) ) {
 967                      return node;
 968                  }
 969              }
 970              return null;
 971          }, 
 972  
 973          /**
 974           * Returns the previous sibling that is an HTMLElement 
 975           * @method getPreviousSibling
 976           * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
 977           * @return {Object} HTMLElement or null if not found
 978           */
 979          getPreviousSibling: function(node) {
 980              node = Y.Dom.get(node);
 981              if (!node) {
 982                  YAHOO.log('getPreviousSibling failed: invalid node argument', 'error', 'Dom');
 983                  return null;
 984              }
 985  
 986              return Y.Dom.getPreviousSiblingBy(node);
 987          }, 
 988  
 989          /**
 990           * Returns the next HTMLElement sibling that passes the boolean method. 
 991           * For performance reasons, IDs are not accepted and argument validation omitted.
 992           * Returns the nearest HTMLElement sibling if no method provided.
 993           * @method getNextSiblingBy
 994           * @param {HTMLElement} node The HTMLElement to use as the starting point 
 995           * @param {Function} method A boolean function used to test siblings
 996           * that receives the sibling node being tested as its only argument
 997           * @return {Object} HTMLElement or null if not found
 998           */
 999          getNextSiblingBy: function(node, method) {
1000              while (node) {
1001                  node = node.nextSibling;
1002                  if ( Y.Dom._testElement(node, method) ) {
1003                      return node;
1004                  }
1005              }
1006              return null;
1007          }, 
1008  
1009          /**
1010           * Returns the next sibling that is an HTMLElement 
1011           * @method getNextSibling
1012           * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
1013           * @return {Object} HTMLElement or null if not found
1014           */
1015          getNextSibling: function(node) {
1016              node = Y.Dom.get(node);
1017              if (!node) {
1018                  YAHOO.log('getNextSibling failed: invalid node argument', 'error', 'Dom');
1019                  return null;
1020              }
1021  
1022              return Y.Dom.getNextSiblingBy(node);
1023          }, 
1024  
1025          /**
1026           * Returns the first HTMLElement child that passes the test method. 
1027           * @method getFirstChildBy
1028           * @param {HTMLElement} node The HTMLElement to use as the starting point 
1029           * @param {Function} method A boolean function used to test children
1030           * that receives the node being tested as its only argument
1031           * @return {Object} HTMLElement or null if not found
1032           */
1033          getFirstChildBy: function(node, method) {
1034              var child = ( Y.Dom._testElement(node.firstChild, method) ) ? node.firstChild : null;
1035              return child || Y.Dom.getNextSiblingBy(node.firstChild, method);
1036          }, 
1037  
1038          /**
1039           * Returns the first HTMLElement child. 
1040           * @method getFirstChild
1041           * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
1042           * @return {Object} HTMLElement or null if not found
1043           */
1044          getFirstChild: function(node, method) {
1045              node = Y.Dom.get(node);
1046              if (!node) {
1047                  YAHOO.log('getFirstChild failed: invalid node argument', 'error', 'Dom');
1048                  return null;
1049              }
1050              return Y.Dom.getFirstChildBy(node);
1051          }, 
1052  
1053          /**
1054           * Returns the last HTMLElement child that passes the test method. 
1055           * @method getLastChildBy
1056           * @param {HTMLElement} node The HTMLElement to use as the starting point 
1057           * @param {Function} method A boolean function used to test children
1058           * that receives the node being tested as its only argument
1059           * @return {Object} HTMLElement or null if not found
1060           */
1061          getLastChildBy: function(node, method) {
1062              if (!node) {
1063                  YAHOO.log('getLastChild failed: invalid node argument', 'error', 'Dom');
1064                  return null;
1065              }
1066              var child = ( Y.Dom._testElement(node.lastChild, method) ) ? node.lastChild : null;
1067              return child || Y.Dom.getPreviousSiblingBy(node.lastChild, method);
1068          }, 
1069  
1070          /**
1071           * Returns the last HTMLElement child. 
1072           * @method getLastChild
1073           * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
1074           * @return {Object} HTMLElement or null if not found
1075           */
1076          getLastChild: function(node) {
1077              node = Y.Dom.get(node);
1078              return Y.Dom.getLastChildBy(node);
1079          }, 
1080  
1081          /**
1082           * Returns an array of HTMLElement childNodes that pass the test method. 
1083           * @method getChildrenBy
1084           * @param {HTMLElement} node The HTMLElement to start from
1085           * @param {Function} method A boolean function used to test children
1086           * that receives the node being tested as its only argument
1087           * @return {Array} A static array of HTMLElements
1088           */
1089          getChildrenBy: function(node, method) {
1090              var child = Y.Dom.getFirstChildBy(node, method),
1091                  children = child ? [child] : [];
1092  
1093              Y.Dom.getNextSiblingBy(child, function(node) {
1094                  if ( !method || method(node) ) {
1095                      children[children.length] = node;
1096                  }
1097                  return false; // fail test to collect all children
1098              });
1099  
1100              return children;
1101          },
1102   
1103          /**
1104           * Returns an array of HTMLElement childNodes. 
1105           * @method getChildren
1106           * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
1107           * @return {Array} A static array of HTMLElements
1108           */
1109          getChildren: function(node) {
1110              node = Y.Dom.get(node);
1111              if (!node) {
1112                  YAHOO.log('getChildren failed: invalid node argument', 'error', 'Dom');
1113              }
1114  
1115              return Y.Dom.getChildrenBy(node);
1116          },
1117  
1118          /**
1119           * Returns the left scroll value of the document 
1120           * @method getDocumentScrollLeft
1121           * @param {HTMLDocument} document (optional) The document to get the scroll value of
1122           * @return {Int}  The amount that the document is scrolled to the left
1123           */
1124          getDocumentScrollLeft: function(doc) {
1125              doc = doc || document;
1126              return Math.max(doc[DOCUMENT_ELEMENT].scrollLeft, doc.body.scrollLeft);
1127          }, 
1128  
1129          /**
1130           * Returns the top scroll value of the document 
1131           * @method getDocumentScrollTop
1132           * @param {HTMLDocument} document (optional) The document to get the scroll value of
1133           * @return {Int}  The amount that the document is scrolled to the top
1134           */
1135          getDocumentScrollTop: function(doc) {
1136              doc = doc || document;
1137              return Math.max(doc[DOCUMENT_ELEMENT].scrollTop, doc.body.scrollTop);
1138          },
1139  
1140          /**
1141           * Inserts the new node as the previous sibling of the reference node 
1142           * @method insertBefore
1143           * @param {String | HTMLElement} newNode The node to be inserted
1144           * @param {String | HTMLElement} referenceNode The node to insert the new node before 
1145           * @return {HTMLElement} The node that was inserted (or null if insert fails) 
1146           */
1147          insertBefore: function(newNode, referenceNode) {
1148              newNode = Y.Dom.get(newNode); 
1149              referenceNode = Y.Dom.get(referenceNode); 
1150              
1151              if (!newNode || !referenceNode || !referenceNode[PARENT_NODE]) {
1152                  YAHOO.log('insertAfter failed: missing or invalid arg(s)', 'error', 'Dom');
1153                  return null;
1154              }       
1155  
1156              return referenceNode[PARENT_NODE].insertBefore(newNode, referenceNode); 
1157          },
1158  
1159          /**
1160           * Inserts the new node as the next sibling of the reference node 
1161           * @method insertAfter
1162           * @param {String | HTMLElement} newNode The node to be inserted
1163           * @param {String | HTMLElement} referenceNode The node to insert the new node after 
1164           * @return {HTMLElement} The node that was inserted (or null if insert fails) 
1165           */
1166          insertAfter: function(newNode, referenceNode) {
1167              newNode = Y.Dom.get(newNode); 
1168              referenceNode = Y.Dom.get(referenceNode); 
1169              
1170              if (!newNode || !referenceNode || !referenceNode[PARENT_NODE]) {
1171                  YAHOO.log('insertAfter failed: missing or invalid arg(s)', 'error', 'Dom');
1172                  return null;
1173              }       
1174  
1175              if (referenceNode.nextSibling) {
1176                  return referenceNode[PARENT_NODE].insertBefore(newNode, referenceNode.nextSibling); 
1177              } else {
1178                  return referenceNode[PARENT_NODE].appendChild(newNode);
1179              }
1180          },
1181  
1182          /**
1183           * Creates a Region based on the viewport relative to the document. 
1184           * @method getClientRegion
1185           * @return {Region} A Region object representing the viewport which accounts for document scroll
1186           */
1187          getClientRegion: function() {
1188              var t = Y.Dom.getDocumentScrollTop(),
1189                  l = Y.Dom.getDocumentScrollLeft(),
1190                  r = Y.Dom.getViewportWidth() + l,
1191                  b = Y.Dom.getViewportHeight() + t;
1192  
1193              return new Y.Region(t, r, b, l);
1194          },
1195  
1196          /**
1197           * Provides a normalized attribute interface. 
1198           * @method setAttribute
1199           * @param {String | HTMLElement} el The target element for the attribute.
1200           * @param {String} attr The attribute to set.
1201           * @param {String} val The value of the attribute.
1202           */
1203          setAttribute: function(el, attr, val) {
1204              Y.Dom.batch(el, Y.Dom._setAttribute, { attr: attr, val: val });
1205          },
1206  
1207          _setAttribute: function(el, args) {
1208              var attr = Y.Dom._toCamel(args.attr),
1209                  val = args.val;
1210  
1211              if (el && el.setAttribute) {
1212                  // set as DOM property, except for BUTTON, which errors on property setter
1213                  if (Y.Dom.DOT_ATTRIBUTES[attr] && el.tagName && el.tagName != 'BUTTON') {
1214                      el[attr] = val;
1215                  } else {
1216                      attr = Y.Dom.CUSTOM_ATTRIBUTES[attr] || attr;
1217                      el.setAttribute(attr, val);
1218                  }
1219              } else {
1220                  YAHOO.log('setAttribute method not available for ' + el, 'error', 'Dom');
1221              }
1222          },
1223  
1224          /**
1225           * Provides a normalized attribute interface. 
1226           * @method getAttribute
1227           * @param {String | HTMLElement} el The target element for the attribute.
1228           * @param {String} attr The attribute to get.
1229           * @return {String} The current value of the attribute. 
1230           */
1231          getAttribute: function(el, attr) {
1232              return Y.Dom.batch(el, Y.Dom._getAttribute, attr);
1233          },
1234  
1235  
1236          _getAttribute: function(el, attr) {
1237              var val;
1238              attr = Y.Dom.CUSTOM_ATTRIBUTES[attr] || attr;
1239  
1240              if (Y.Dom.DOT_ATTRIBUTES[attr]) {
1241                  val = el[attr];
1242              } else if (el && 'getAttribute' in el) {
1243                  if (/^(?:href|src)$/.test(attr)) { // use IE flag to return exact value
1244                      val = el.getAttribute(attr, 2);
1245                  } else {
1246                      val = el.getAttribute(attr);
1247                  }
1248              } else {
1249                  YAHOO.log('getAttribute method not available for ' + el, 'error', 'Dom');
1250              }
1251  
1252              return val;
1253          },
1254  
1255          _toCamel: function(property) {
1256              var c = propertyCache;
1257  
1258              function tU(x,l) {
1259                  return l.toUpperCase();
1260              }
1261  
1262              return c[property] || (c[property] = property.indexOf('-') === -1 ? 
1263                                      property :
1264                                      property.replace( /-([a-z])/gi, tU ));
1265          },
1266  
1267          _getClassRegex: function(className) {
1268              var re;
1269              if (className !== undefined) { // allow empty string to pass
1270                  if (className.exec) { // already a RegExp
1271                      re = className;
1272                  } else {
1273                      re = reCache[className];
1274                      if (!re) {
1275                          // escape special chars (".", "[", etc.)
1276                          className = className.replace(Y.Dom._patterns.CLASS_RE_TOKENS, '\\$1');
1277                          className = className.replace(/\s+/g, SPACE); // convert line breaks and other delims
1278                          re = reCache[className] = new RegExp(C_START + className + C_END, G);
1279                      }
1280                  }
1281              }
1282              return re;
1283          },
1284  
1285          _patterns: {
1286              ROOT_TAG: /^body|html$/i, // body for quirks mode, html for standards,
1287              CLASS_RE_TOKENS: /([\.\(\)\^\$\*\+\?\|\[\]\{\}\\])/g
1288          },
1289  
1290  
1291          _testElement: function(node, method) {
1292              return node && node[NODE_TYPE] == 1 && ( !method || method(node) );
1293          },
1294  
1295          _calcBorders: function(node, xy2) {
1296              var t = parseInt(Y.Dom[GET_COMPUTED_STYLE](node, BORDER_TOP_WIDTH), 10) || 0,
1297                  l = parseInt(Y.Dom[GET_COMPUTED_STYLE](node, BORDER_LEFT_WIDTH), 10) || 0;
1298              if (isGecko) {
1299                  if (RE_TABLE.test(node[TAG_NAME])) {
1300                      t = 0;
1301                      l = 0;
1302                  }
1303              }
1304              xy2[0] += l;
1305              xy2[1] += t;
1306              return xy2;
1307          }
1308      };
1309          
1310      var _getComputedStyle = Y.Dom[GET_COMPUTED_STYLE];
1311      // fix opera computedStyle default color unit (convert to rgb)
1312      if (UA.opera) {
1313          Y.Dom[GET_COMPUTED_STYLE] = function(node, att) {
1314              var val = _getComputedStyle(node, att);
1315              if (RE_COLOR.test(att)) {
1316                  val = Y.Dom.Color.toRGB(val);
1317              }
1318  
1319              return val;
1320          };
1321  
1322      }
1323  
1324      // safari converts transparent to rgba(), others use "transparent"
1325      if (UA.webkit) {
1326          Y.Dom[GET_COMPUTED_STYLE] = function(node, att) {
1327              var val = _getComputedStyle(node, att);
1328  
1329              if (val === 'rgba(0, 0, 0, 0)') {
1330                  val = 'transparent'; 
1331              }
1332  
1333              return val;
1334          };
1335  
1336      }
1337  
1338      if (UA.ie && UA.ie >= 8) {
1339          Y.Dom.DOT_ATTRIBUTES.type = true; // IE 8 errors on input.setAttribute('type')
1340      }
1341  })();
1342  /**
1343   * A region is a representation of an object on a grid.  It is defined
1344   * by the top, right, bottom, left extents, so is rectangular by default.  If 
1345   * other shapes are required, this class could be extended to support it.
1346   * @namespace YAHOO.util
1347   * @class Region
1348   * @param {Int} t the top extent
1349   * @param {Int} r the right extent
1350   * @param {Int} b the bottom extent
1351   * @param {Int} l the left extent
1352   * @constructor
1353   */
1354  YAHOO.util.Region = function(t, r, b, l) {
1355  
1356      /**
1357       * The region's top extent
1358       * @property top
1359       * @type Int
1360       */
1361      this.top = t;
1362      
1363      /**
1364       * The region's top extent
1365       * @property y
1366       * @type Int
1367       */
1368      this.y = t;
1369      
1370      /**
1371       * The region's top extent as index, for symmetry with set/getXY
1372       * @property 1
1373       * @type Int
1374       */
1375      this[1] = t;
1376  
1377      /**
1378       * The region's right extent
1379       * @property right
1380       * @type int
1381       */
1382      this.right = r;
1383  
1384      /**
1385       * The region's bottom extent
1386       * @property bottom
1387       * @type Int
1388       */
1389      this.bottom = b;
1390  
1391      /**
1392       * The region's left extent
1393       * @property left
1394       * @type Int
1395       */
1396      this.left = l;
1397      
1398      /**
1399       * The region's left extent
1400       * @property x
1401       * @type Int
1402       */
1403      this.x = l;
1404      
1405      /**
1406       * The region's left extent as index, for symmetry with set/getXY
1407       * @property 0
1408       * @type Int
1409       */
1410      this[0] = l;
1411  
1412      /**
1413       * The region's total width 
1414       * @property width 
1415       * @type Int
1416       */
1417      this.width = this.right - this.left;
1418  
1419      /**
1420       * The region's total height 
1421       * @property height 
1422       * @type Int
1423       */
1424      this.height = this.bottom - this.top;
1425  };
1426  
1427  /**
1428   * Returns true if this region contains the region passed in
1429   * @method contains
1430   * @param  {Region}  region The region to evaluate
1431   * @return {Boolean}        True if the region is contained with this region, 
1432   *                          else false
1433   */
1434  YAHOO.util.Region.prototype.contains = function(region) {
1435      return ( region.left   >= this.left   && 
1436               region.right  <= this.right  && 
1437               region.top    >= this.top    && 
1438               region.bottom <= this.bottom    );
1439  
1440      // this.logger.debug("does " + this + " contain " + region + " ... " + ret);
1441  };
1442  
1443  /**
1444   * Returns the area of the region
1445   * @method getArea
1446   * @return {Int} the region's area
1447   */
1448  YAHOO.util.Region.prototype.getArea = function() {
1449      return ( (this.bottom - this.top) * (this.right - this.left) );
1450  };
1451  
1452  /**
1453   * Returns the region where the passed in region overlaps with this one
1454   * @method intersect
1455   * @param  {Region} region The region that intersects
1456   * @return {Region}        The overlap region, or null if there is no overlap
1457   */
1458  YAHOO.util.Region.prototype.intersect = function(region) {
1459      var t = Math.max( this.top,    region.top    ),
1460          r = Math.min( this.right,  region.right  ),
1461          b = Math.min( this.bottom, region.bottom ),
1462          l = Math.max( this.left,   region.left   );
1463      
1464      if (b >= t && r >= l) {
1465          return new YAHOO.util.Region(t, r, b, l);
1466      } else {
1467          return null;
1468      }
1469  };
1470  
1471  /**
1472   * Returns the region representing the smallest region that can contain both
1473   * the passed in region and this region.
1474   * @method union
1475   * @param  {Region} region The region that to create the union with
1476   * @return {Region}        The union region
1477   */
1478  YAHOO.util.Region.prototype.union = function(region) {
1479      var t = Math.min( this.top,    region.top    ),
1480          r = Math.max( this.right,  region.right  ),
1481          b = Math.max( this.bottom, region.bottom ),
1482          l = Math.min( this.left,   region.left   );
1483  
1484      return new YAHOO.util.Region(t, r, b, l);
1485  };
1486  
1487  /**
1488   * toString
1489   * @method toString
1490   * @return string the region properties
1491   */
1492  YAHOO.util.Region.prototype.toString = function() {
1493      return ( "Region {"    +
1494               "top: "       + this.top    + 
1495               ", right: "   + this.right  + 
1496               ", bottom: "  + this.bottom + 
1497               ", left: "    + this.left   + 
1498               ", height: "  + this.height + 
1499               ", width: "    + this.width   + 
1500               "}" );
1501  };
1502  
1503  /**
1504   * Returns a region that is occupied by the DOM element
1505   * @method getRegion
1506   * @param  {HTMLElement} el The element
1507   * @return {Region}         The region that the element occupies
1508   * @static
1509   */
1510  YAHOO.util.Region.getRegion = function(el) {
1511      var p = YAHOO.util.Dom.getXY(el),
1512          t = p[1],
1513          r = p[0] + el.offsetWidth,
1514          b = p[1] + el.offsetHeight,
1515          l = p[0];
1516  
1517      return new YAHOO.util.Region(t, r, b, l);
1518  };
1519  
1520  /////////////////////////////////////////////////////////////////////////////
1521  
1522  
1523  /**
1524   * A point is a region that is special in that it represents a single point on 
1525   * the grid.
1526   * @namespace YAHOO.util
1527   * @class Point
1528   * @param {Int} x The X position of the point
1529   * @param {Int} y The Y position of the point
1530   * @constructor
1531   * @extends YAHOO.util.Region
1532   */
1533  YAHOO.util.Point = function(x, y) {
1534     if (YAHOO.lang.isArray(x)) { // accept input from Dom.getXY, Event.getXY, etc.
1535        y = x[1]; // dont blow away x yet
1536        x = x[0];
1537     }
1538   
1539      YAHOO.util.Point.superclass.constructor.call(this, y, x, y, x);
1540  };
1541  
1542  YAHOO.extend(YAHOO.util.Point, YAHOO.util.Region);
1543  
1544  (function() {
1545  /**
1546   * Internal methods used to add style management functionality to DOM.
1547   * @module dom
1548   * @class IEStyle
1549   * @namespace YAHOO.util.Dom
1550   */
1551  
1552  var Y = YAHOO.util, 
1553      CLIENT_TOP = 'clientTop',
1554      CLIENT_LEFT = 'clientLeft',
1555      PARENT_NODE = 'parentNode',
1556      RIGHT = 'right',
1557      HAS_LAYOUT = 'hasLayout',
1558      PX = 'px',
1559      OPACITY = 'opacity',
1560      AUTO = 'auto',
1561      BORDER_LEFT_WIDTH = 'borderLeftWidth',
1562      BORDER_TOP_WIDTH = 'borderTopWidth',
1563      BORDER_RIGHT_WIDTH = 'borderRightWidth',
1564      BORDER_BOTTOM_WIDTH = 'borderBottomWidth',
1565      VISIBLE = 'visible',
1566      TRANSPARENT = 'transparent',
1567      HEIGHT = 'height',
1568      WIDTH = 'width',
1569      STYLE = 'style',
1570      CURRENT_STYLE = 'currentStyle',
1571  
1572  // IE getComputedStyle
1573  // TODO: unit-less lineHeight (e.g. 1.22)
1574      re_size = /^width|height$/,
1575      re_unit = /^(\d[.\d]*)+(em|ex|px|gd|rem|vw|vh|vm|ch|mm|cm|in|pt|pc|deg|rad|ms|s|hz|khz|%){1}?/i,
1576  
1577      ComputedStyle = {
1578          /**
1579          * @method get
1580          * @description Method used by DOM to get style information for IE
1581          * @param {HTMLElement} el The element to check
1582          * @param {String} property The property to check
1583          * @returns {String} The computed style
1584          */
1585          get: function(el, property) {
1586              var value = '',
1587                  current = el[CURRENT_STYLE][property];
1588  
1589              if (property === OPACITY) {
1590                  value = Y.Dom.getStyle(el, OPACITY);        
1591              } else if (!current || (current.indexOf && current.indexOf(PX) > -1)) { // no need to convert
1592                  value = current;
1593              } else if (Y.Dom.IE_COMPUTED[property]) { // use compute function
1594                  value = Y.Dom.IE_COMPUTED[property](el, property);
1595              } else if (re_unit.test(current)) { // convert to pixel
1596                  value = Y.Dom.IE.ComputedStyle.getPixel(el, property);
1597              } else {
1598                  value = current;
1599              }
1600  
1601              return value;
1602          },
1603          /**
1604          * @method getOffset
1605          * @description Determine the offset of an element
1606          * @param {HTMLElement} el The element to check
1607          * @param {String} prop The property to check.
1608          * @return {String} The offset
1609          */
1610          getOffset: function(el, prop) {
1611              var current = el[CURRENT_STYLE][prop],                        // value of "width", "top", etc.
1612                  capped = prop.charAt(0).toUpperCase() + prop.substr(1), // "Width", "Top", etc.
1613                  offset = 'offset' + capped,                             // "offsetWidth", "offsetTop", etc.
1614                  pixel = 'pixel' + capped,                               // "pixelWidth", "pixelTop", etc.
1615                  value = '',
1616                  actual;
1617  
1618              if (current == AUTO) {
1619                  actual = el[offset]; // offsetHeight/Top etc.
1620                  if (actual === undefined) { // likely "right" or "bottom"
1621                      value = 0;
1622                  }
1623  
1624                  value = actual;
1625                  if (re_size.test(prop)) { // account for box model diff 
1626                      el[STYLE][prop] = actual; 
1627                      if (el[offset] > actual) {
1628                          // the difference is padding + border (works in Standards & Quirks modes)
1629                          value = actual - (el[offset] - actual);
1630                      }
1631                      el[STYLE][prop] = AUTO; // revert to auto
1632                  }
1633              } else { // convert units to px
1634                  if (!el[STYLE][pixel] && !el[STYLE][prop]) { // need to map style.width to currentStyle (no currentStyle.pixelWidth)
1635                      el[STYLE][prop] = current;              // no style.pixelWidth if no style.width
1636                  }
1637                  value = el[STYLE][pixel];
1638              }
1639              return value + PX;
1640          },
1641          /**
1642          * @method getBorderWidth
1643          * @description Try to determine the width of an elements border
1644          * @param {HTMLElement} el The element to check
1645          * @param {String} property The property to check
1646          * @return {String} The elements border width
1647          */
1648          getBorderWidth: function(el, property) {
1649              // clientHeight/Width = paddingBox (e.g. offsetWidth - borderWidth)
1650              // clientTop/Left = borderWidth
1651              var value = null;
1652              if (!el[CURRENT_STYLE][HAS_LAYOUT]) { // TODO: unset layout?
1653                  el[STYLE].zoom = 1; // need layout to measure client
1654              }
1655  
1656              switch(property) {
1657                  case BORDER_TOP_WIDTH:
1658                      value = el[CLIENT_TOP];
1659                      break;
1660                  case BORDER_BOTTOM_WIDTH:
1661                      value = el.offsetHeight - el.clientHeight - el[CLIENT_TOP];
1662                      break;
1663                  case BORDER_LEFT_WIDTH:
1664                      value = el[CLIENT_LEFT];
1665                      break;
1666                  case BORDER_RIGHT_WIDTH:
1667                      value = el.offsetWidth - el.clientWidth - el[CLIENT_LEFT];
1668                      break;
1669              }
1670              return value + PX;
1671          },
1672          /**
1673          * @method getPixel
1674          * @description Get the pixel value from a style property
1675          * @param {HTMLElement} node The element to check
1676          * @param {String} att The attribute to check
1677          * @return {String} The pixel value
1678          */
1679          getPixel: function(node, att) {
1680              // use pixelRight to convert to px
1681              var val = null,
1682                  styleRight = node[CURRENT_STYLE][RIGHT],
1683                  current = node[CURRENT_STYLE][att];
1684  
1685              node[STYLE][RIGHT] = current;
1686              val = node[STYLE].pixelRight;
1687              node[STYLE][RIGHT] = styleRight; // revert
1688  
1689              return val + PX;
1690          },
1691  
1692          /**
1693          * @method getMargin
1694          * @description Get the margin value from a style property
1695          * @param {HTMLElement} node The element to check
1696          * @param {String} att The attribute to check
1697          * @return {String} The margin value
1698          */
1699          getMargin: function(node, att) {
1700              var val;
1701              if (node[CURRENT_STYLE][att] == AUTO) {
1702                  val = 0 + PX;
1703              } else {
1704                  val = Y.Dom.IE.ComputedStyle.getPixel(node, att);
1705              }
1706              return val;
1707          },
1708  
1709          /**
1710          * @method getVisibility
1711          * @description Get the visibility of an element
1712          * @param {HTMLElement} node The element to check
1713          * @param {String} att The attribute to check
1714          * @return {String} The value
1715          */
1716          getVisibility: function(node, att) {
1717              var current;
1718              while ( (current = node[CURRENT_STYLE]) && current[att] == 'inherit') { // NOTE: assignment in test
1719                  node = node[PARENT_NODE];
1720              }
1721              return (current) ? current[att] : VISIBLE;
1722          },
1723  
1724          /**
1725          * @method getColor
1726          * @description Get the color of an element
1727          * @param {HTMLElement} node The element to check
1728          * @param {String} att The attribute to check
1729          * @return {String} The value
1730          */
1731          getColor: function(node, att) {
1732              return Y.Dom.Color.toRGB(node[CURRENT_STYLE][att]) || TRANSPARENT;
1733          },
1734  
1735          /**
1736          * @method getBorderColor
1737          * @description Get the bordercolor of an element
1738          * @param {HTMLElement} node The element to check
1739          * @param {String} att The attribute to check
1740          * @return {String} The value
1741          */
1742          getBorderColor: function(node, att) {
1743              var current = node[CURRENT_STYLE],
1744                  val = current[att] || current.color;
1745              return Y.Dom.Color.toRGB(Y.Dom.Color.toHex(val));
1746          }
1747  
1748      },
1749  
1750  //fontSize: getPixelFont,
1751      IEComputed = {};
1752  
1753  IEComputed.top = IEComputed.right = IEComputed.bottom = IEComputed.left = 
1754          IEComputed[WIDTH] = IEComputed[HEIGHT] = ComputedStyle.getOffset;
1755  
1756  IEComputed.color = ComputedStyle.getColor;
1757  
1758  IEComputed[BORDER_TOP_WIDTH] = IEComputed[BORDER_RIGHT_WIDTH] =
1759          IEComputed[BORDER_BOTTOM_WIDTH] = IEComputed[BORDER_LEFT_WIDTH] =
1760          ComputedStyle.getBorderWidth;
1761  
1762  IEComputed.marginTop = IEComputed.marginRight = IEComputed.marginBottom =
1763          IEComputed.marginLeft = ComputedStyle.getMargin;
1764  
1765  IEComputed.visibility = ComputedStyle.getVisibility;
1766  IEComputed.borderColor = IEComputed.borderTopColor =
1767          IEComputed.borderRightColor = IEComputed.borderBottomColor =
1768          IEComputed.borderLeftColor = ComputedStyle.getBorderColor;
1769  
1770  Y.Dom.IE_COMPUTED = IEComputed;
1771  Y.Dom.IE_ComputedStyle = ComputedStyle;
1772  })();
1773  (function() {
1774  /**
1775   * Add style management functionality to DOM.
1776   * @module dom
1777   * @class Color
1778   * @namespace YAHOO.util.Dom
1779   */
1780  
1781  var TO_STRING = 'toString',
1782      PARSE_INT = parseInt,
1783      RE = RegExp,
1784      Y = YAHOO.util;
1785  
1786  Y.Dom.Color = {
1787      /**
1788      * @property KEYWORDS
1789      * @type Object
1790      * @description Color keywords used when converting to Hex
1791      */
1792      KEYWORDS: {
1793          black: '000',
1794          silver: 'c0c0c0',
1795          gray: '808080',
1796          white: 'fff',
1797          maroon: '800000',
1798          red: 'f00',
1799          purple: '800080',
1800          fuchsia: 'f0f',
1801          green: '008000',
1802          lime: '0f0',
1803          olive: '808000',
1804          yellow: 'ff0',
1805          navy: '000080',
1806          blue: '00f',
1807          teal: '008080',
1808          aqua: '0ff'
1809      },
1810      /**
1811      * @property re_RGB
1812      * @private
1813      * @type Regex
1814      * @description Regex to parse rgb(0,0,0) formatted strings
1815      */
1816      re_RGB: /^rgb\(([0-9]+)\s*,\s*([0-9]+)\s*,\s*([0-9]+)\)$/i,
1817      /**
1818      * @property re_hex
1819      * @private
1820      * @type Regex
1821      * @description Regex to parse #123456 formatted strings
1822      */
1823      re_hex: /^#?([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})$/i,
1824      /**
1825      * @property re_hex3
1826      * @private
1827      * @type Regex
1828      * @description Regex to parse #123 formatted strings
1829      */
1830      re_hex3: /([0-9A-F])/gi,
1831      /**
1832      * @method toRGB
1833      * @description Converts a hex or color string to an rgb string: rgb(0,0,0)
1834      * @param {String} val The string to convert to RGB notation.
1835      * @returns {String} The converted string
1836      */
1837      toRGB: function(val) {
1838          if (!Y.Dom.Color.re_RGB.test(val)) {
1839              val = Y.Dom.Color.toHex(val);
1840          }
1841  
1842          if(Y.Dom.Color.re_hex.exec(val)) {
1843              val = 'rgb(' + [
1844                  PARSE_INT(RE.$1, 16),
1845                  PARSE_INT(RE.$2, 16),
1846                  PARSE_INT(RE.$3, 16)
1847              ].join(', ') + ')';
1848          }
1849          return val;
1850      },
1851      /**
1852      * @method toHex
1853      * @description Converts an rgb or color string to a hex string: #123456
1854      * @param {String} val The string to convert to hex notation.
1855      * @returns {String} The converted string
1856      */
1857      toHex: function(val) {
1858          val = Y.Dom.Color.KEYWORDS[val] || val;
1859          if (Y.Dom.Color.re_RGB.exec(val)) {
1860              val = [
1861                  Number(RE.$1).toString(16),
1862                  Number(RE.$2).toString(16),
1863                  Number(RE.$3).toString(16)
1864              ];
1865  
1866              for (var i = 0; i < val.length; i++) {
1867                  if (val[i].length < 2) {
1868                      val[i] = '0' + val[i];
1869                  }
1870              }
1871  
1872              val = val.join('');
1873          }
1874  
1875          if (val.length < 6) {
1876              val = val.replace(Y.Dom.Color.re_hex3, '$1$1');
1877          }
1878  
1879          if (val !== 'transparent' && val.indexOf('#') < 0) {
1880              val = '#' + val;
1881          }
1882  
1883          return val.toUpperCase();
1884      }
1885  };
1886  }());
1887  YAHOO.register("dom", YAHOO.util.Dom, {version: "2.9.0", build: "2800"});
1888  
1889      if (YAHOO.env._id_counter < 1e+6) {
1890          YAHOO.env._id_counter =  Y.Env._yidx * 1e+6;
1891      }
1892  }, '2.9.0' ,{"requires": ["yui2-yahoo"]});