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/testing/selenium-core/lib/prototype.js

http://datanucleus-appengine.googlecode.com/
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   1/*  Prototype JavaScript framework, version 1.5.0_rc0
   2 *  (c) 2005 Sam Stephenson <sam@conio.net>
   3 *
   4 *  Prototype is freely distributable under the terms of an MIT-style license.
   5 *  For details, see the Prototype web site: http://prototype.conio.net/
   6 *
   7/*--------------------------------------------------------------------------*/
   8
   9var Prototype = {
  10  Version: '1.5.0_rc0',
  11  ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
  12
  13  emptyFunction: function() {},
  14  K: function(x) {return x}
  15}
  16
  17var Class = {
  18  create: function() {
  19    return function() {
  20      this.initialize.apply(this, arguments);
  21    }
  22  }
  23}
  24
  25var Abstract = new Object();
  26
  27Object.extend = function(destination, source) {
  28  for (var property in source) {
  29    destination[property] = source[property];
  30  }
  31  return destination;
  32}
  33
  34Object.inspect = function(object) {
  35  try {
  36    if (object == undefined) return 'undefined';
  37    if (object == null) return 'null';
  38    return object.inspect ? object.inspect() : object.toString();
  39  } catch (e) {
  40    if (e instanceof RangeError) return '...';
  41    throw e;
  42  }
  43}
  44
  45Function.prototype.bind = function() {
  46  var __method = this, args = $A(arguments), object = args.shift();
  47  return function() {
  48    return __method.apply(object, args.concat($A(arguments)));
  49  }
  50}
  51
  52Function.prototype.bindAsEventListener = function(object) {
  53  var __method = this;
  54  return function(event) {
  55    return __method.call(object, event || window.event);
  56  }
  57}
  58
  59Object.extend(Number.prototype, {
  60  toColorPart: function() {
  61    var digits = this.toString(16);
  62    if (this < 16) return '0' + digits;
  63    return digits;
  64  },
  65
  66  succ: function() {
  67    return this + 1;
  68  },
  69
  70  times: function(iterator) {
  71    $R(0, this, true).each(iterator);
  72    return this;
  73  }
  74});
  75
  76var Try = {
  77  these: function() {
  78    var returnValue;
  79
  80    for (var i = 0; i < arguments.length; i++) {
  81      var lambda = arguments[i];
  82      try {
  83        returnValue = lambda();
  84        break;
  85      } catch (e) {}
  86    }
  87
  88    return returnValue;
  89  }
  90}
  91
  92/*--------------------------------------------------------------------------*/
  93
  94var PeriodicalExecuter = Class.create();
  95PeriodicalExecuter.prototype = {
  96  initialize: function(callback, frequency) {
  97    this.callback = callback;
  98    this.frequency = frequency;
  99    this.currentlyExecuting = false;
 100
 101    this.registerCallback();
 102  },
 103
 104  registerCallback: function() {
 105    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
 106  },
 107
 108  onTimerEvent: function() {
 109    if (!this.currentlyExecuting) {
 110      try {
 111        this.currentlyExecuting = true;
 112        this.callback();
 113      } finally {
 114        this.currentlyExecuting = false;
 115      }
 116    }
 117  }
 118}
 119Object.extend(String.prototype, {
 120  gsub: function(pattern, replacement) {
 121    var result = '', source = this, match;
 122    replacement = arguments.callee.prepareReplacement(replacement);
 123
 124    while (source.length > 0) {
 125      if (match = source.match(pattern)) {
 126        result += source.slice(0, match.index);
 127        result += (replacement(match) || '').toString();
 128        source  = source.slice(match.index + match[0].length);
 129      } else {
 130        result += source, source = '';
 131      }
 132    }
 133    return result;
 134  },
 135
 136  sub: function(pattern, replacement, count) {
 137    replacement = this.gsub.prepareReplacement(replacement);
 138    count = count === undefined ? 1 : count;
 139
 140    return this.gsub(pattern, function(match) {
 141      if (--count < 0) return match[0];
 142      return replacement(match);
 143    });
 144  },
 145
 146  scan: function(pattern, iterator) {
 147    this.gsub(pattern, iterator);
 148    return this;
 149  },
 150
 151  truncate: function(length, truncation) {
 152    length = length || 30;
 153    truncation = truncation === undefined ? '...' : truncation;
 154    return this.length > length ?
 155      this.slice(0, length - truncation.length) + truncation : this;
 156  },
 157
 158  strip: function() {
 159    return this.replace(/^\s+/, '').replace(/\s+$/, '');
 160  },
 161
 162  stripTags: function() {
 163    return this.replace(/<\/?[^>]+>/gi, '');
 164  },
 165
 166  stripScripts: function() {
 167    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
 168  },
 169
 170  extractScripts: function() {
 171    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
 172    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
 173    return (this.match(matchAll) || []).map(function(scriptTag) {
 174      return (scriptTag.match(matchOne) || ['', ''])[1];
 175    });
 176  },
 177
 178  evalScripts: function() {
 179    return this.extractScripts().map(function(script) { return eval(script) });
 180  },
 181
 182  escapeHTML: function() {
 183    var div = document.createElement('div');
 184    var text = document.createTextNode(this);
 185    div.appendChild(text);
 186    return div.innerHTML;
 187  },
 188
 189  unescapeHTML: function() {
 190    var div = document.createElement('div');
 191    div.innerHTML = this.stripTags();
 192    return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
 193  },
 194
 195  toQueryParams: function() {
 196    var pairs = this.match(/^\??(.*)$/)[1].split('&');
 197    return pairs.inject({}, function(params, pairString) {
 198      var pair = pairString.split('=');
 199      params[pair[0]] = pair[1];
 200      return params;
 201    });
 202  },
 203
 204  toArray: function() {
 205    return this.split('');
 206  },
 207
 208  camelize: function() {
 209    var oStringList = this.split('-');
 210    if (oStringList.length == 1) return oStringList[0];
 211
 212    var camelizedString = this.indexOf('-') == 0
 213      ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
 214      : oStringList[0];
 215
 216    for (var i = 1, len = oStringList.length; i < len; i++) {
 217      var s = oStringList[i];
 218      camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
 219    }
 220
 221    return camelizedString;
 222  },
 223
 224  inspect: function() {
 225    return "'" + this.replace(/\\/g, '\\\\').replace(/'/g, '\\\'') + "'";
 226  }
 227});
 228
 229String.prototype.gsub.prepareReplacement = function(replacement) {
 230  if (typeof replacement == 'function') return replacement;
 231  var template = new Template(replacement);
 232  return function(match) { return template.evaluate(match) };
 233}
 234
 235String.prototype.parseQuery = String.prototype.toQueryParams;
 236
 237var Template = Class.create();
 238Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 239Template.prototype = {
 240  initialize: function(template, pattern) {
 241    this.template = template.toString();
 242    this.pattern  = pattern || Template.Pattern;
 243  },
 244
 245  evaluate: function(object) {
 246    return this.template.gsub(this.pattern, function(match) {
 247      var before = match[1];
 248      if (before == '\\') return match[2];
 249      return before + (object[match[3]] || '').toString();
 250    });
 251  }
 252}
 253
 254var $break    = new Object();
 255var $continue = new Object();
 256
 257var Enumerable = {
 258  each: function(iterator) {
 259    var index = 0;
 260    try {
 261      this._each(function(value) {
 262        try {
 263          iterator(value, index++);
 264        } catch (e) {
 265          if (e != $continue) throw e;
 266        }
 267      });
 268    } catch (e) {
 269      if (e != $break) throw e;
 270    }
 271  },
 272
 273  all: function(iterator) {
 274    var result = true;
 275    this.each(function(value, index) {
 276      result = result && !!(iterator || Prototype.K)(value, index);
 277      if (!result) throw $break;
 278    });
 279    return result;
 280  },
 281
 282  any: function(iterator) {
 283    var result = true;
 284    this.each(function(value, index) {
 285      if (result = !!(iterator || Prototype.K)(value, index))
 286        throw $break;
 287    });
 288    return result;
 289  },
 290
 291  collect: function(iterator) {
 292    var results = [];
 293    this.each(function(value, index) {
 294      results.push(iterator(value, index));
 295    });
 296    return results;
 297  },
 298
 299  detect: function (iterator) {
 300    var result;
 301    this.each(function(value, index) {
 302      if (iterator(value, index)) {
 303        result = value;
 304        throw $break;
 305      }
 306    });
 307    return result;
 308  },
 309
 310  findAll: function(iterator) {
 311    var results = [];
 312    this.each(function(value, index) {
 313      if (iterator(value, index))
 314        results.push(value);
 315    });
 316    return results;
 317  },
 318
 319  grep: function(pattern, iterator) {
 320    var results = [];
 321    this.each(function(value, index) {
 322      var stringValue = value.toString();
 323      if (stringValue.match(pattern))
 324        results.push((iterator || Prototype.K)(value, index));
 325    })
 326    return results;
 327  },
 328
 329  include: function(object) {
 330    var found = false;
 331    this.each(function(value) {
 332      if (value == object) {
 333        found = true;
 334        throw $break;
 335      }
 336    });
 337    return found;
 338  },
 339
 340  inject: function(memo, iterator) {
 341    this.each(function(value, index) {
 342      memo = iterator(memo, value, index);
 343    });
 344    return memo;
 345  },
 346
 347  invoke: function(method) {
 348    var args = $A(arguments).slice(1);
 349    return this.collect(function(value) {
 350      return value[method].apply(value, args);
 351    });
 352  },
 353
 354  max: function(iterator) {
 355    var result;
 356    this.each(function(value, index) {
 357      value = (iterator || Prototype.K)(value, index);
 358      if (result == undefined || value >= result)
 359        result = value;
 360    });
 361    return result;
 362  },
 363
 364  min: function(iterator) {
 365    var result;
 366    this.each(function(value, index) {
 367      value = (iterator || Prototype.K)(value, index);
 368      if (result == undefined || value < result)
 369        result = value;
 370    });
 371    return result;
 372  },
 373
 374  partition: function(iterator) {
 375    var trues = [], falses = [];
 376    this.each(function(value, index) {
 377      ((iterator || Prototype.K)(value, index) ?
 378        trues : falses).push(value);
 379    });
 380    return [trues, falses];
 381  },
 382
 383  pluck: function(property) {
 384    var results = [];
 385    this.each(function(value, index) {
 386      results.push(value[property]);
 387    });
 388    return results;
 389  },
 390
 391  reject: function(iterator) {
 392    var results = [];
 393    this.each(function(value, index) {
 394      if (!iterator(value, index))
 395        results.push(value);
 396    });
 397    return results;
 398  },
 399
 400  sortBy: function(iterator) {
 401    return this.collect(function(value, index) {
 402      return {value: value, criteria: iterator(value, index)};
 403    }).sort(function(left, right) {
 404      var a = left.criteria, b = right.criteria;
 405      return a < b ? -1 : a > b ? 1 : 0;
 406    }).pluck('value');
 407  },
 408
 409  toArray: function() {
 410    return this.collect(Prototype.K);
 411  },
 412
 413  zip: function() {
 414    var iterator = Prototype.K, args = $A(arguments);
 415    if (typeof args.last() == 'function')
 416      iterator = args.pop();
 417
 418    var collections = [this].concat(args).map($A);
 419    return this.map(function(value, index) {
 420      return iterator(collections.pluck(index));
 421    });
 422  },
 423
 424  inspect: function() {
 425    return '#<Enumerable:' + this.toArray().inspect() + '>';
 426  }
 427}
 428
 429Object.extend(Enumerable, {
 430  map:     Enumerable.collect,
 431  find:    Enumerable.detect,
 432  select:  Enumerable.findAll,
 433  member:  Enumerable.include,
 434  entries: Enumerable.toArray
 435});
 436var $A = Array.from = function(iterable) {
 437  if (!iterable) return [];
 438  if (iterable.toArray) {
 439    return iterable.toArray();
 440  } else {
 441    var results = [];
 442    for (var i = 0; i < iterable.length; i++)
 443      results.push(iterable[i]);
 444    return results;
 445  }
 446}
 447
 448Object.extend(Array.prototype, Enumerable);
 449
 450if (!Array.prototype._reverse)
 451  Array.prototype._reverse = Array.prototype.reverse;
 452
 453Object.extend(Array.prototype, {
 454  _each: function(iterator) {
 455    for (var i = 0; i < this.length; i++)
 456      iterator(this[i]);
 457  },
 458
 459  clear: function() {
 460    this.length = 0;
 461    return this;
 462  },
 463
 464  first: function() {
 465    return this[0];
 466  },
 467
 468  last: function() {
 469    return this[this.length - 1];
 470  },
 471
 472  compact: function() {
 473    return this.select(function(value) {
 474      return value != undefined || value != null;
 475    });
 476  },
 477
 478  flatten: function() {
 479    return this.inject([], function(array, value) {
 480      return array.concat(value && value.constructor == Array ?
 481        value.flatten() : [value]);
 482    });
 483  },
 484
 485  without: function() {
 486    var values = $A(arguments);
 487    return this.select(function(value) {
 488      return !values.include(value);
 489    });
 490  },
 491
 492  indexOf: function(object) {
 493    for (var i = 0; i < this.length; i++)
 494      if (this[i] == object) return i;
 495    return -1;
 496  },
 497
 498  reverse: function(inline) {
 499    return (inline !== false ? this : this.toArray())._reverse();
 500  },
 501
 502  inspect: function() {
 503    return '[' + this.map(Object.inspect).join(', ') + ']';
 504  }
 505});
 506var Hash = {
 507  _each: function(iterator) {
 508    for (var key in this) {
 509      var value = this[key];
 510      if (typeof value == 'function') continue;
 511
 512      var pair = [key, value];
 513      pair.key = key;
 514      pair.value = value;
 515      iterator(pair);
 516    }
 517  },
 518
 519  keys: function() {
 520    return this.pluck('key');
 521  },
 522
 523  values: function() {
 524    return this.pluck('value');
 525  },
 526
 527  merge: function(hash) {
 528    return $H(hash).inject($H(this), function(mergedHash, pair) {
 529      mergedHash[pair.key] = pair.value;
 530      return mergedHash;
 531    });
 532  },
 533
 534  toQueryString: function() {
 535    return this.map(function(pair) {
 536      return pair.map(encodeURIComponent).join('=');
 537    }).join('&');
 538  },
 539
 540  inspect: function() {
 541    return '#<Hash:{' + this.map(function(pair) {
 542      return pair.map(Object.inspect).join(': ');
 543    }).join(', ') + '}>';
 544  }
 545}
 546
 547function $H(object) {
 548  var hash = Object.extend({}, object || {});
 549  Object.extend(hash, Enumerable);
 550  Object.extend(hash, Hash);
 551  return hash;
 552}
 553ObjectRange = Class.create();
 554Object.extend(ObjectRange.prototype, Enumerable);
 555Object.extend(ObjectRange.prototype, {
 556  initialize: function(start, end, exclusive) {
 557    this.start = start;
 558    this.end = end;
 559    this.exclusive = exclusive;
 560  },
 561
 562  _each: function(iterator) {
 563    var value = this.start;
 564    do {
 565      iterator(value);
 566      value = value.succ();
 567    } while (this.include(value));
 568  },
 569
 570  include: function(value) {
 571    if (value < this.start)
 572      return false;
 573    if (this.exclusive)
 574      return value < this.end;
 575    return value <= this.end;
 576  }
 577});
 578
 579var $R = function(start, end, exclusive) {
 580  return new ObjectRange(start, end, exclusive);
 581}
 582
 583var Ajax = {
 584  getTransport: function() {
 585    return Try.these(
 586      function() {return new XMLHttpRequest()},
 587      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
 588      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
 589    ) || false;
 590  },
 591
 592  activeRequestCount: 0
 593}
 594
 595Ajax.Responders = {
 596  responders: [],
 597
 598  _each: function(iterator) {
 599    this.responders._each(iterator);
 600  },
 601
 602  register: function(responderToAdd) {
 603    if (!this.include(responderToAdd))
 604      this.responders.push(responderToAdd);
 605  },
 606
 607  unregister: function(responderToRemove) {
 608    this.responders = this.responders.without(responderToRemove);
 609  },
 610
 611  dispatch: function(callback, request, transport, json) {
 612    this.each(function(responder) {
 613      if (responder[callback] && typeof responder[callback] == 'function') {
 614        try {
 615          responder[callback].apply(responder, [request, transport, json]);
 616        } catch (e) {}
 617      }
 618    });
 619  }
 620};
 621
 622Object.extend(Ajax.Responders, Enumerable);
 623
 624Ajax.Responders.register({
 625  onCreate: function() {
 626    Ajax.activeRequestCount++;
 627  },
 628
 629  onComplete: function() {
 630    Ajax.activeRequestCount--;
 631  }
 632});
 633
 634Ajax.Base = function() {};
 635Ajax.Base.prototype = {
 636  setOptions: function(options) {
 637    this.options = {
 638      method:       'post',
 639      asynchronous: true,
 640      contentType:  'application/x-www-form-urlencoded',
 641      parameters:   ''
 642    }
 643    Object.extend(this.options, options || {});
 644  },
 645
 646  responseIsSuccess: function() {
 647    return this.transport.status == undefined
 648        || this.transport.status == 0
 649        || (this.transport.status >= 200 && this.transport.status < 300);
 650  },
 651
 652  responseIsFailure: function() {
 653    return !this.responseIsSuccess();
 654  }
 655}
 656
 657Ajax.Request = Class.create();
 658Ajax.Request.Events =
 659  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
 660
 661Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
 662  initialize: function(url, options) {
 663    this.transport = Ajax.getTransport();
 664    this.setOptions(options);
 665    this.request(url);
 666  },
 667
 668  request: function(url) {
 669    var parameters = this.options.parameters || '';
 670    if (parameters.length > 0) parameters += '&_=';
 671
 672    try {
 673      this.url = url;
 674      if (this.options.method == 'get' && parameters.length > 0)
 675        this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;
 676
 677      Ajax.Responders.dispatch('onCreate', this, this.transport);
 678
 679      this.transport.open(this.options.method, this.url,
 680        this.options.asynchronous);
 681
 682      if (this.options.asynchronous) {
 683        this.transport.onreadystatechange = this.onStateChange.bind(this);
 684        setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
 685      }
 686
 687      this.setRequestHeaders();
 688
 689      var body = this.options.postBody ? this.options.postBody : parameters;
 690      this.transport.send(this.options.method == 'post' ? body : null);
 691
 692    } catch (e) {
 693      this.dispatchException(e);
 694    }
 695  },
 696
 697  setRequestHeaders: function() {
 698    var requestHeaders =
 699      ['X-Requested-With', 'XMLHttpRequest',
 700       'X-Prototype-Version', Prototype.Version,
 701       'Accept', 'text/javascript, text/html, application/xml, text/xml, */*'];
 702
 703    if (this.options.method == 'post') {
 704      requestHeaders.push('Content-type', this.options.contentType);
 705
 706      /* Force "Connection: close" for Mozilla browsers to work around
 707       * a bug where XMLHttpReqeuest sends an incorrect Content-length
 708       * header. See Mozilla Bugzilla #246651.
 709       */
 710      if (this.transport.overrideMimeType)
 711        requestHeaders.push('Connection', 'close');
 712    }
 713
 714    if (this.options.requestHeaders)
 715      requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
 716
 717    for (var i = 0; i < requestHeaders.length; i += 2)
 718      this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
 719  },
 720
 721  onStateChange: function() {
 722    var readyState = this.transport.readyState;
 723    if (readyState != 1)
 724      this.respondToReadyState(this.transport.readyState);
 725  },
 726
 727  header: function(name) {
 728    try {
 729      return this.transport.getResponseHeader(name);
 730    } catch (e) {}
 731  },
 732
 733  evalJSON: function() {
 734    try {
 735      return eval('(' + this.header('X-JSON') + ')');
 736    } catch (e) {}
 737  },
 738
 739  evalResponse: function() {
 740    try {
 741      return eval(this.transport.responseText);
 742    } catch (e) {
 743      this.dispatchException(e);
 744    }
 745  },
 746
 747  respondToReadyState: function(readyState) {
 748    var event = Ajax.Request.Events[readyState];
 749    var transport = this.transport, json = this.evalJSON();
 750
 751    if (event == 'Complete') {
 752      try {
 753        (this.options['on' + this.transport.status]
 754         || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
 755         || Prototype.emptyFunction)(transport, json);
 756      } catch (e) {
 757        this.dispatchException(e);
 758      }
 759
 760      if ((this.header('Content-type') || '').match(/^text\/javascript/i))
 761        this.evalResponse();
 762    }
 763
 764    try {
 765      (this.options['on' + event] || Prototype.emptyFunction)(transport, json);
 766      Ajax.Responders.dispatch('on' + event, this, transport, json);
 767    } catch (e) {
 768      this.dispatchException(e);
 769    }
 770
 771    /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
 772    if (event == 'Complete')
 773      this.transport.onreadystatechange = Prototype.emptyFunction;
 774  },
 775
 776  dispatchException: function(exception) {
 777    (this.options.onException || Prototype.emptyFunction)(this, exception);
 778    Ajax.Responders.dispatch('onException', this, exception);
 779  }
 780});
 781
 782Ajax.Updater = Class.create();
 783
 784Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
 785  initialize: function(container, url, options) {
 786    this.containers = {
 787      success: container.success ? $(container.success) : $(container),
 788      failure: container.failure ? $(container.failure) :
 789        (container.success ? null : $(container))
 790    }
 791
 792    this.transport = Ajax.getTransport();
 793    this.setOptions(options);
 794
 795    var onComplete = this.options.onComplete || Prototype.emptyFunction;
 796    this.options.onComplete = (function(transport, object) {
 797      this.updateContent();
 798      onComplete(transport, object);
 799    }).bind(this);
 800
 801    this.request(url);
 802  },
 803
 804  updateContent: function() {
 805    var receiver = this.responseIsSuccess() ?
 806      this.containers.success : this.containers.failure;
 807    var response = this.transport.responseText;
 808
 809    if (!this.options.evalScripts)
 810      response = response.stripScripts();
 811
 812    if (receiver) {
 813      if (this.options.insertion) {
 814        new this.options.insertion(receiver, response);
 815      } else {
 816        Element.update(receiver, response);
 817      }
 818    }
 819
 820    if (this.responseIsSuccess()) {
 821      if (this.onComplete)
 822        setTimeout(this.onComplete.bind(this), 10);
 823    }
 824  }
 825});
 826
 827Ajax.PeriodicalUpdater = Class.create();
 828Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
 829  initialize: function(container, url, options) {
 830    this.setOptions(options);
 831    this.onComplete = this.options.onComplete;
 832
 833    this.frequency = (this.options.frequency || 2);
 834    this.decay = (this.options.decay || 1);
 835
 836    this.updater = {};
 837    this.container = container;
 838    this.url = url;
 839
 840    this.start();
 841  },
 842
 843  start: function() {
 844    this.options.onComplete = this.updateComplete.bind(this);
 845    this.onTimerEvent();
 846  },
 847
 848  stop: function() {
 849    this.updater.onComplete = undefined;
 850    clearTimeout(this.timer);
 851    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
 852  },
 853
 854  updateComplete: function(request) {
 855    if (this.options.decay) {
 856      this.decay = (request.responseText == this.lastText ?
 857        this.decay * this.options.decay : 1);
 858
 859      this.lastText = request.responseText;
 860    }
 861    this.timer = setTimeout(this.onTimerEvent.bind(this),
 862      this.decay * this.frequency * 1000);
 863  },
 864
 865  onTimerEvent: function() {
 866    this.updater = new Ajax.Updater(this.container, this.url, this.options);
 867  }
 868});
 869function $() {
 870  var results = [], element;
 871  for (var i = 0; i < arguments.length; i++) {
 872    element = arguments[i];
 873    if (typeof element == 'string')
 874      element = document.getElementById(element);
 875    results.push(Element.extend(element));
 876  }
 877  return results.length < 2 ? results[0] : results;
 878}
 879
 880document.getElementsByClassName = function(className, parentElement) {
 881  var children = ($(parentElement) || document.body).getElementsByTagName('*');
 882  return $A(children).inject([], function(elements, child) {
 883    if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
 884      elements.push(Element.extend(child));
 885    return elements;
 886  });
 887}
 888
 889/*--------------------------------------------------------------------------*/
 890
 891if (!window.Element)
 892  var Element = new Object();
 893
 894Element.extend = function(element) {
 895  if (!element) return;
 896  if (_nativeExtensions) return element;
 897
 898  if (!element._extended && element.tagName && element != window) {
 899    var methods = Element.Methods, cache = Element.extend.cache;
 900    for (property in methods) {
 901      var value = methods[property];
 902      if (typeof value == 'function')
 903        element[property] = cache.findOrStore(value);
 904    }
 905  }
 906
 907  element._extended = true;
 908  return element;
 909}
 910
 911Element.extend.cache = {
 912  findOrStore: function(value) {
 913    return this[value] = this[value] || function() {
 914      return value.apply(null, [this].concat($A(arguments)));
 915    }
 916  }
 917}
 918
 919Element.Methods = {
 920  visible: function(element) {
 921    return $(element).style.display != 'none';
 922  },
 923
 924  toggle: function() {
 925    for (var i = 0; i < arguments.length; i++) {
 926      var element = $(arguments[i]);
 927      Element[Element.visible(element) ? 'hide' : 'show'](element);
 928    }
 929  },
 930
 931  hide: function() {
 932    for (var i = 0; i < arguments.length; i++) {
 933      var element = $(arguments[i]);
 934      element.style.display = 'none';
 935    }
 936  },
 937
 938  show: function() {
 939    for (var i = 0; i < arguments.length; i++) {
 940      var element = $(arguments[i]);
 941      element.style.display = '';
 942    }
 943  },
 944
 945  remove: function(element) {
 946    element = $(element);
 947    element.parentNode.removeChild(element);
 948  },
 949
 950  update: function(element, html) {
 951    $(element).innerHTML = html.stripScripts();
 952    setTimeout(function() {html.evalScripts()}, 10);
 953  },
 954
 955  replace: function(element, html) {
 956    element = $(element);
 957    if (element.outerHTML) {
 958      element.outerHTML = html.stripScripts();
 959    } else {
 960      var range = element.ownerDocument.createRange();
 961      range.selectNodeContents(element);
 962      element.parentNode.replaceChild(
 963        range.createContextualFragment(html.stripScripts()), element);
 964    }
 965    setTimeout(function() {html.evalScripts()}, 10);
 966  },
 967
 968  getHeight: function(element) {
 969    element = $(element);
 970    return element.offsetHeight;
 971  },
 972
 973  classNames: function(element) {
 974    return new Element.ClassNames(element);
 975  },
 976
 977  hasClassName: function(element, className) {
 978    if (!(element = $(element))) return;
 979    return Element.classNames(element).include(className);
 980  },
 981
 982  addClassName: function(element, className) {
 983    if (!(element = $(element))) return;
 984    return Element.classNames(element).add(className);
 985  },
 986
 987  removeClassName: function(element, className) {
 988    if (!(element = $(element))) return;
 989    return Element.classNames(element).remove(className);
 990  },
 991
 992  // removes whitespace-only text node children
 993  cleanWhitespace: function(element) {
 994    element = $(element);
 995    for (var i = 0; i < element.childNodes.length; i++) {
 996      var node = element.childNodes[i];
 997      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
 998        Element.remove(node);
 999    }
1000  },
1001
1002  empty: function(element) {
1003    return $(element).innerHTML.match(/^\s*$/);
1004  },
1005
1006  childOf: function(element, ancestor) {
1007    element = $(element), ancestor = $(ancestor);
1008    while (element = element.parentNode)
1009      if (element == ancestor) return true;
1010    return false;
1011  },
1012
1013  scrollTo: function(element) {
1014    element = $(element);
1015    var x = element.x ? element.x : element.offsetLeft,
1016        y = element.y ? element.y : element.offsetTop;
1017    window.scrollTo(x, y);
1018  },
1019
1020  getStyle: function(element, style) {
1021    element = $(element);
1022    var value = element.style[style.camelize()];
1023    if (!value) {
1024      if (document.defaultView && document.defaultView.getComputedStyle) {
1025        var css = document.defaultView.getComputedStyle(element, null);
1026        value = css ? css.getPropertyValue(style) : null;
1027      } else if (element.currentStyle) {
1028        value = element.currentStyle[style.camelize()];
1029      }
1030    }
1031
1032    if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
1033      if (Element.getStyle(element, 'position') == 'static') value = 'auto';
1034
1035    return value == 'auto' ? null : value;
1036  },
1037
1038  setStyle: function(element, style) {
1039    element = $(element);
1040    for (var name in style)
1041      element.style[name.camelize()] = style[name];
1042  },
1043
1044  getDimensions: function(element) {
1045    element = $(element);
1046    if (Element.getStyle(element, 'display') != 'none')
1047      return {width: element.offsetWidth, height: element.offsetHeight};
1048
1049    // All *Width and *Height properties give 0 on elements with display none,
1050    // so enable the element temporarily
1051    var els = element.style;
1052    var originalVisibility = els.visibility;
1053    var originalPosition = els.position;
1054    els.visibility = 'hidden';
1055    els.position = 'absolute';
1056    els.display = '';
1057    var originalWidth = element.clientWidth;
1058    var originalHeight = element.clientHeight;
1059    els.display = 'none';
1060    els.position = originalPosition;
1061    els.visibility = originalVisibility;
1062    return {width: originalWidth, height: originalHeight};
1063  },
1064
1065  makePositioned: function(element) {
1066    element = $(element);
1067    var pos = Element.getStyle(element, 'position');
1068    if (pos == 'static' || !pos) {
1069      element._madePositioned = true;
1070      element.style.position = 'relative';
1071      // Opera returns the offset relative to the positioning context, when an
1072      // element is position relative but top and left have not been defined
1073      if (window.opera) {
1074        element.style.top = 0;
1075        element.style.left = 0;
1076      }
1077    }
1078  },
1079
1080  undoPositioned: function(element) {
1081    element = $(element);
1082    if (element._madePositioned) {
1083      element._madePositioned = undefined;
1084      element.style.position =
1085        element.style.top =
1086        element.style.left =
1087        element.style.bottom =
1088        element.style.right = '';
1089    }
1090  },
1091
1092  makeClipping: function(element) {
1093    element = $(element);
1094    if (element._overflow) return;
1095    element._overflow = element.style.overflow;
1096    if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
1097      element.style.overflow = 'hidden';
1098  },
1099
1100  undoClipping: function(element) {
1101    element = $(element);
1102    if (element._overflow) return;
1103    element.style.overflow = element._overflow;
1104    element._overflow = undefined;
1105  }
1106}
1107
1108Object.extend(Element, Element.Methods);
1109
1110var _nativeExtensions = false;
1111
1112if(!HTMLElement && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
1113  var HTMLElement = {}
1114  HTMLElement.prototype = document.createElement('div').__proto__;
1115}
1116
1117Element.addMethods = function(methods) {
1118  Object.extend(Element.Methods, methods || {});
1119
1120  if(typeof HTMLElement != 'undefined') {
1121    var methods = Element.Methods, cache = Element.extend.cache;
1122    for (property in methods) {
1123      var value = methods[property];
1124      if (typeof value == 'function')
1125        HTMLElement.prototype[property] = cache.findOrStore(value);
1126    }
1127    _nativeExtensions = true;
1128  }
1129}
1130
1131Element.addMethods();
1132
1133var Toggle = new Object();
1134Toggle.display = Element.toggle;
1135
1136/*--------------------------------------------------------------------------*/
1137
1138Abstract.Insertion = function(adjacency) {
1139  this.adjacency = adjacency;
1140}
1141
1142Abstract.Insertion.prototype = {
1143  initialize: function(element, content) {
1144    this.element = $(element);
1145    this.content = content.stripScripts();
1146
1147    if (this.adjacency && this.element.insertAdjacentHTML) {
1148      try {
1149        this.element.insertAdjacentHTML(this.adjacency, this.content);
1150      } catch (e) {
1151        var tagName = this.element.tagName.toLowerCase();
1152        if (tagName == 'tbody' || tagName == 'tr') {
1153          this.insertContent(this.contentFromAnonymousTable());
1154        } else {
1155          throw e;
1156        }
1157      }
1158    } else {
1159      this.range = this.element.ownerDocument.createRange();
1160      if (this.initializeRange) this.initializeRange();
1161      this.insertContent([this.range.createContextualFragment(this.content)]);
1162    }
1163
1164    setTimeout(function() {content.evalScripts()}, 10);
1165  },
1166
1167  contentFromAnonymousTable: function() {
1168    var div = document.createElement('div');
1169    div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
1170    return $A(div.childNodes[0].childNodes[0].childNodes);
1171  }
1172}
1173
1174var Insertion = new Object();
1175
1176Insertion.Before = Class.create();
1177Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
1178  initializeRange: function() {
1179    this.range.setStartBefore(this.element);
1180  },
1181
1182  insertContent: function(fragments) {
1183    fragments.each((function(fragment) {
1184      this.element.parentNode.insertBefore(fragment, this.element);
1185    }).bind(this));
1186  }
1187});
1188
1189Insertion.Top = Class.create();
1190Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
1191  initializeRange: function() {
1192    this.range.selectNodeContents(this.element);
1193    this.range.collapse(true);
1194  },
1195
1196  insertContent: function(fragments) {
1197    fragments.reverse(false).each((function(fragment) {
1198      this.element.insertBefore(fragment, this.element.firstChild);
1199    }).bind(this));
1200  }
1201});
1202
1203Insertion.Bottom = Class.create();
1204Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
1205  initializeRange: function() {
1206    this.range.selectNodeContents(this.element);
1207    this.range.collapse(this.element);
1208  },
1209
1210  insertContent: function(fragments) {
1211    fragments.each((function(fragment) {
1212      this.element.appendChild(fragment);
1213    }).bind(this));
1214  }
1215});
1216
1217Insertion.After = Class.create();
1218Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
1219  initializeRange: function() {
1220    this.range.setStartAfter(this.element);
1221  },
1222
1223  insertContent: function(fragments) {
1224    fragments.each((function(fragment) {
1225      this.element.parentNode.insertBefore(fragment,
1226        this.element.nextSibling);
1227    }).bind(this));
1228  }
1229});
1230
1231/*--------------------------------------------------------------------------*/
1232
1233Element.ClassNames = Class.create();
1234Element.ClassNames.prototype = {
1235  initialize: function(element) {
1236    this.element = $(element);
1237  },
1238
1239  _each: function(iterator) {
1240    this.element.className.split(/\s+/).select(function(name) {
1241      return name.length > 0;
1242    })._each(iterator);
1243  },
1244
1245  set: function(className) {
1246    this.element.className = className;
1247  },
1248
1249  add: function(classNameToAdd) {
1250    if (this.include(classNameToAdd)) return;
1251    this.set(this.toArray().concat(classNameToAdd).join(' '));
1252  },
1253
1254  remove: function(classNameToRemove) {
1255    if (!this.include(classNameToRemove)) return;
1256    this.set(this.select(function(className) {
1257      return className != classNameToRemove;
1258    }).join(' '));
1259  },
1260
1261  toString: function() {
1262    return this.toArray().join(' ');
1263  }
1264}
1265
1266Object.extend(Element.ClassNames.prototype, Enumerable);
1267var Selector = Class.create();
1268Selector.prototype = {
1269  initialize: function(expression) {
1270    this.params = {classNames: []};
1271    this.expression = expression.toString().strip();
1272    this.parseExpression();
1273    this.compileMatcher();
1274  },
1275
1276  parseExpression: function() {
1277    function abort(message) { throw 'Parse error in selector: ' + message; }
1278
1279    if (this.expression == '')  abort('empty expression');
1280
1281    var params = this.params, expr = this.expression, match, modifier, clause, rest;
1282    while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {
1283      params.attributes = params.attributes || [];
1284      params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});
1285      expr = match[1];
1286    }
1287
1288    if (expr == '*') return this.params.wildcard = true;
1289
1290    while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {
1291      modifier = match[1], clause = match[2], rest = match[3];
1292      switch (modifier) {
1293        case '#':       params.id = clause; break;
1294        case '.':       params.classNames.push(clause); break;
1295        case '':
1296        case undefined: params.tagName = clause.toUpperCase(); break;
1297        default:        abort(expr.inspect());
1298      }
1299      expr = rest;
1300    }
1301
1302    if (expr.length > 0) abort(expr.inspect());
1303  },
1304
1305  buildMatchExpression: function() {
1306    var params = this.params, conditions = [], clause;
1307
1308    if (params.wildcard)
1309      conditions.push('true');
1310    if (clause = params.id)
1311      conditions.push('element.id == ' + clause.inspect());
1312    if (clause = params.tagName)
1313      conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());
1314    if ((clause = params.classNames).length > 0)
1315      for (var i = 0; i < clause.length; i++)
1316        conditions.push('Element.hasClassName(element, ' + clause[i].inspect() + ')');
1317    if (clause = params.attributes) {
1318      clause.each(function(attribute) {
1319        var value = 'element.getAttribute(' + attribute.name.inspect() + ')';
1320        var splitValueBy = function(delimiter) {
1321          return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';
1322        }
1323
1324        switch (attribute.operator) {
1325          case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;
1326          case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;
1327          case '|=':      conditions.push(
1328                            splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()
1329                          ); break;
1330          case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;
1331          case '':
1332          case undefined: conditions.push(value + ' != null'); break;
1333          default:        throw 'Unknown operator ' + attribute.operator + ' in selector';
1334        }
1335      });
1336    }
1337
1338    return conditions.join(' && ');
1339  },
1340
1341  compileMatcher: function() {
1342    this.match = new Function('element', 'if (!element.tagName) return false; \n' +
1343    'return ' + this.buildMatchExpression());
1344  },
1345
1346  findElements: function(scope) {
1347    var element;
1348
1349    if (element = $(this.params.id))
1350      if (this.match(element))
1351        if (!scope || Element.childOf(element, scope))
1352          return [element];
1353
1354    scope = (scope || document).getElementsByTagName(this.params.tagName || '*');
1355
1356    var results = [];
1357    for (var i = 0; i < scope.length; i++)
1358      if (this.match(element = scope[i]))
1359        results.push(Element.extend(element));
1360
1361    return results;
1362  },
1363
1364  toString: function() {
1365    return this.expression;
1366  }
1367}
1368
1369function $$() {
1370  return $A(arguments).map(function(expression) {
1371    return expression.strip().split(/\s+/).inject([null], function(results, expr) {
1372      var selector = new Selector(expr);
1373      return results.map(selector.findElements.bind(selector)).flatten();
1374    });
1375  }).flatten();
1376}
1377var Field = {
1378  clear: function() {
1379    for (var i = 0; i < arguments.length; i++)
1380      $(arguments[i]).value = '';
1381  },
1382
1383  focus: function(element) {
1384    $(element).focus();
1385  },
1386
1387  present: function() {
1388    for (var i = 0; i < arguments.length; i++)
1389      if ($(arguments[i]).value == '') return false;
1390    return true;
1391  },
1392
1393  select: function(element) {
1394    $(element).select();
1395  },
1396
1397  activate: function(element) {
1398    element = $(element);
1399    element.focus();
1400    if (element.select)
1401      element.select();
1402  }
1403}
1404
1405/*--------------------------------------------------------------------------*/
1406
1407var Form = {
1408  serialize: function(form) {
1409    var elements = Form.getElements($(form));
1410    var queryComponents = new Array();
1411
1412    for (var i = 0; i < elements.length; i++) {
1413      var queryComponent = Form.Element.serialize(elements[i]);
1414      if (queryComponent)
1415        queryComponents.push(queryComponent);
1416    }
1417
1418    return queryComponents.join('&');
1419  },
1420
1421  getElements: function(form) {
1422    form = $(form);
1423    var elements = new Array();
1424
1425    for (var tagName in Form.Element.Serializers) {
1426      var tagElements = form.getElementsByTagName(tagName);
1427      for (var j = 0; j < tagElements.length; j++)
1428        elements.push(tagElements[j]);
1429    }
1430    return elements;
1431  },
1432
1433  getInputs: function(form, typeName, name) {
1434    form = $(form);
1435    var inputs = form.getElementsByTagName('input');
1436
1437    if (!typeName && !name)
1438      return inputs;
1439
1440    var matchingInputs = new Array();
1441    for (var i = 0; i < inputs.length; i++) {
1442      var input = inputs[i];
1443      if ((typeName && input.type != typeName) ||
1444          (name && input.name != name))
1445        continue;
1446      matchingInputs.push(input);
1447    }
1448
1449    return matchingInputs;
1450  },
1451
1452  disable: function(form) {
1453    var elements = Form.getElements(form);
1454    for (var i = 0; i < elements.length; i++) {
1455      var element = elements[i];
1456      element.blur();
1457      element.disabled = 'true';
1458    }
1459  },
1460
1461  enable: function(form) {
1462    var elements = Form.getElements(form);
1463    for (var i = 0; i < elements.length; i++) {
1464      var element = elements[i];
1465      element.disabled = '';
1466    }
1467  },
1468
1469  findFirstElement: function(form) {
1470    return Form.getElements(form).find(function(element) {
1471      return element.type != 'hidden' && !element.disabled &&
1472        ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
1473    });
1474  },
1475
1476  focusFirstElement: function(form) {
1477    Field.activate(Form.findFirstElement(form));
1478  },
1479
1480  reset: function(form) {
1481    $(form).reset();
1482  }
1483}
1484
1485Form.Element = {
1486  serialize: function(element) {
1487    element = $(element);
1488    var method = element.tagName.toLowerCase();
1489    var parameter = Form.Element.Serializers[method](element);
1490
1491    if (parameter) {
1492      var key = encodeURIComponent(parameter[0]);
1493      if (key.length == 0) return;
1494
1495      if (parameter[1].constructor != Array)
1496        parameter[1] = [parameter[1]];
1497
1498      return parameter[1].map(function(value) {
1499        return key + '=' + encodeURIComponent(value);
1500      }).join('&');
1501    }
1502  },
1503
1504  getValue: function(element) {
1505    element = $(element);
1506    var method = element.tagName.toLowerCase();
1507    var parameter = Form.Element.Serializers[method](element);
1508
1509    if (parameter)
1510      return parameter[1];
1511  }
1512}
1513
1514Form.Element.Serializers = {
1515  input: function(element) {
1516    switch (element.type.toLowerCase()) {
1517      case 'submit':
1518      case 'hidden':
1519      case 'password':
1520      case 'text':
1521        return Form.Element.Serializers.textarea(element);
1522      case 'checkbox':
1523      case 'radio':
1524        return Form.Element.Serializers.inputSelector(element);
1525    }
1526    return false;
1527  },
1528
1529  inputSelector: function(element) {
1530    if (element.checked)
1531      return [element.name, element.value];
1532  },
1533
1534  textarea: function(element) {
1535    return [element.name, element.value];
1536  },
1537
1538  select: function(element) {
1539    return Form.Element.Serializers[element.type == 'select-one' ?
1540      'selectOne' : 'selectMany'](element);
1541  },
1542
1543  selectOne: function(element) {
1544    var value = '', opt, index = element.selectedIndex;
1545    if (index >= 0) {
1546      opt = element.options[index];
1547      value = opt.value || opt.text;
1548    }
1549    return [element.name, value];
1550  },
1551
1552  selectMany: function(element) {
1553    var value = [];
1554    for (var i = 0; i < element.length; i++) {
1555      var opt = element.options[i];
1556      if (opt.selected)
1557        value.push(opt.value || opt.text);
1558    }
1559    return [element.name, value];
1560  }
1561}
1562
1563/*--------------------------------------------------------------------------*/
1564
1565var $F = Form.Element.getValue;
1566
1567/*--------------------------------------------------------------------------*/
1568
1569Abstract.TimedObserver = function() {}
1570Abstract.TimedObserver.prototype = {
1571  initialize: function(element, frequency, callback) {
1572    this.frequency = frequency;
1573    this.element   = $(element);
1574    this.callback  = callback;
1575
1576    this.lastValue = this.getValue();
1577    this.registerCallback();
1578  },
1579
1580  registerCallback: function() {
1581    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
1582  },
1583
1584  onTimerEvent: function() {
1585    var value = this.getValue();
1586    if (this.lastValue != value) {
1587      this.callback(this.element, value);
1588      this.lastValue = value;
1589    }
1590  }
1591}
1592
1593Form.Element.Observer = Class.create();
1594Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
1595  getValue: function() {
1596    return Form.Element.getValue(this.element);
1597  }
1598});
1599
1600Form.Observer = Class.create();
1601Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
1602  getValue: function() {
1603    return Form.serialize(this.element);
1604  }
1605});
1606
1607/*--------------------------------------------------------------------------*/
1608
1609Abstract.EventObserver = function() {}
1610Abstract.EventObserver.prototype = {
1611  initialize: function(element, callback) {
1612    this.element  = $(element);
1613    this.callback = callback;
1614
1615    this.lastValue = this.getValue();
1616    if (this.element.tagName.toLowerCase() == 'form')
1617      this.registerFormCallbacks();
1618    else
1619      this.registerCallback(this.element);
1620  },
1621
1622  onElementEvent: function() {
1623    var value = this.getValue();
1624    if (this.lastValue != value) {
1625      this.callback(this.element, value);
1626      this.lastValue = value;
1627    }
1628  },
1629
1630  registerFormCallbacks: function() {
1631    var elements = Form.getElements(this.element);
1632    for (var i = 0; i < elements.length; i++)
1633      this.registerCallback(elements[i]);
1634  },
1635
1636  registerCallback: function(element) {
1637    if (element.type) {
1638      switch (element.type.toLowerCase()) {
1639        case 'checkbox':
1640        case 'radio':
1641          Event.observe(element, 'click', this.onElementEvent.bind(this));
1642          break;
1643        case 'password':
1644        case 'text':
1645        case 'textarea':
1646        case 'select-one':
1647        case 'select-multiple':
1648          Event.observe(element, 'change', this.onElementEvent.bind(this));
1649          break;
1650      }
1651    }
1652  }
1653}
1654
1655Form.Element.EventObserver = Class.create();
1656Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
1657  getValue: function() {
1658    return Form.Element.getValue(this.element);
1659  }
1660});
1661
1662Form.EventObserver = Class.create();
1663Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
1664  getValue: function() {
1665    return Form.serialize(this.element);
1666  }
1667});
1668if (!window.Event) {
1669  var Event = new Object();
1670}
1671
1672Object.extend(Event, {
1673  KEY_BACKSPACE: 8,
1674  KEY_TAB:       9,
1675  KEY_RETURN:   13,
1676  KEY_ESC:      27,
1677  KEY_LEFT:     37,
1678  KEY_UP:       38,
1679  KEY_RIGHT:    39,
1680  KEY_DOWN:     40,
1681  KEY_DELETE:   46,
1682
1683  element: function(event) {
1684    return event.target || event.srcElement;
1685  },
1686
1687  isLeftClick: function(event) {
1688    return (((event.which) && (event.which == 1)) ||
1689            ((event.button) && (event.button == 1)));
1690  },
1691
1692  pointerX: function(event) {
1693    return event.pageX || (event.clientX +
1694      (document.documentElement.scrollLeft || document.body.scrollLeft));
1695  },
1696
1697  pointerY: function(event) {
1698    return event.pageY || (event.clientY +
1699      (document.documentElement.scrollTop || document.body.scrollTop));
1700  },
1701
1702  stop: function(event) {
1703    if (event.preventDefault) {
1704      event.preventDefault();
1705      event.stopPropagation();
1706    } else {
1707      event.returnValue = false;
1708      event.cancelBubble = true;
1709    }
1710  },
1711
1712  // find the first node with the given tagName, starting from the
1713  // node the event was triggered on; traverses the DOM upwards
1714  findElement: function(event, tagName) {
1715    var element = Event.element(event);
1716    while (element.parentNode && (!element.tagName ||
1717        (element.tagName.toUpperCase() != tagName.toUpperCase())))
1718      element = element.parentNode;
1719    return element;
1720  },
1721
1722  observers: false,
1723
1724  _observeAndCache: function(element, name, observer, useCapture) {
1725    if (!this.observers) this.observers = [];
1726    if (element.addEventListener) {
1727      this.observers.push([element, name, observer, useCapture]);
1728      element.addEventListener(name, observer, useCapture);
1729    } else if (element.attachEvent) {
1730      this.observers.push([element, name, observer, useCapture]);
1731      element.attachEvent('on' + name, observer);
1732    }
1733  },
1734
1735  unloadCache: function() {
1736    if (!Event.observers) return;
1737    for (var i = 0; i < Event.observers.length; i++) {
1738      Event.stopObserving.apply(this, Event.observers[i]);
1739      Event.observers[i][0] = null;
1740    }
1741    Event.observers = false;
1742  },
1743
1744  observe: function(element, name, observer, useCapture) {
1745    var element = $(element);
1746    useCapture = useCapture || false;
1747
1748    if (name == 'keypress' &&
1749        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
1750        || element.attachEvent))
1751      name = 'keydown';
1752
1753    this._observeAndCache(element, name, observer, useCapture);
1754  },
1755
1756  stopObserving: function(element, name, observer, useCapture) {
1757    var element = $(element);
1758    useCapture = useCapture || false;
1759
1760    if (name == 'keypress' &&
1761        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
1762        || element.detachEvent))
1763      name = 'keydown';
1764
1765    if (element.removeEventListener) {
1766      element.removeEventListener(name, observer, useCapture);
1767    } else if (element.detachEvent) {
1768      element.detachEvent('on' + name, observer);
1769    }
1770  }
1771});
1772
1773/* prevent memory leaks in IE */
1774if (navigator.appVersion.match(/\bMSIE\b/))
1775  Event.observe(window, 'unload', Event.unloadCache, false);
1776var Position = {
1777  // set to true if needed, warning: firefox performance problems
1778  // NOT neeeded for page scrolling, only if draggable contained in
1779  // scrollable elements
1780  includeScrollOffsets: false,
1781
1782  // must be called before calling withinIncludingScrolloffset, every time the
1783  // page is scrolled
1784  prepare: function() {
1785    this.deltaX =  window.pageXOffset
1786                || document.documentElement.scrollLeft
1787                || document.body.scrollLeft
1788                || 0;
1789    this.deltaY =  window.pageYOffset
1790                || document.documentElement.scrollTop
1791                || document.body.scrollTop
1792                || 0;
1793  },
1794
1795  realOffset: function(element) {
1796    var valueT = 0, valueL = 0;
1797    do {
1798      valueT += element.scrollTop  || 0;
1799      valueL += element.scrollLeft || 0;
1800      element = element.parentNode;
1801    } while (element);
1802    return [valueL, valueT];
1803  },
1804
1805  cumulativeOffset: function(element) {
1806    var valueT = 0, valueL = 0;
1807    do {
1808      valueT += element.offsetTop  || 0;
1809      valueL += element.offsetLeft || 0;
1810      element = element.offsetParent;
1811    } while (element);
1812    return [valueL, valueT];
1813  },
1814
1815  positionedOffset: function(element) {
1816    var valueT = 0, valueL = 0;
1817    do {
1818      valueT += element.offsetTop  || 0;
1819      valueL += element.offsetLeft || 0;
1820      element = element.offsetParent;
1821      if (element) {
1822        p = Element.getStyle(element, 'position');
1823        if (p == 'relative' || p == 'absolute') break;
1824      }
1825    } while (element);
1826    return [valueL, valueT];
1827  },
1828
1829  offsetParent: function(element) {
1830    if (element.offsetParent) return element.offsetParent;
1831    if (element == document.body) return element;
1832
1833    while ((element = element.parentNode) && element != document.body)
1834      if (Element.getStyle(element, 'position') != 'static')
1835        return element;
1836
1837    return document.body;
1838  },
1839
1840  // caches x/y coordinate pair to use with overlap
1841  within: function(element, x, y) {
1842    if (this.includeScrollOffsets)
1843      return this.withinIncludingScrolloffsets(element, x, y);
1844    this.xcomp = x;
1845    this.ycomp = y;
1846    this.offset = this.cumulativeOffset(element);
1847
1848    return (y >= this.offset[1] &&
1849     

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