Prototype JavaScript framework, version 1.4.0 [复制链接]

/* Prototype JavaScript framework, version 1.4.0
* (c) 2005 Sam Stephenson <[email protected]>
*
* Prototype is freely distributable under the terms of an MIT-style license.
* For details, see the Prototype web site: http://prototype.conio.net/
*
/*--------------------------------------------------------------------------*/
var Prototype = {
Version: '1.4.0',
ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
emptyFunction: function() {},
K: function(x) {return x}
}
var Class = {
create: function() {
  return function() {
    this.initialize.apply(this, arguments);
  }
}
}
var Abstract = new Object();
Object.extend = function(destination, source) {
for (property in source) {
  destination[property] = source[property];
}
return destination;
}
Object.inspect = function(object) {
try {
  if (object == undefined) return 'undefined';
  if (object == null) return 'null';
  return object.inspect ? object.inspect() : object.toString();
} catch (e) {
  if (e instanceof RangeError) return '...';
  throw e;
}
}
Function.prototype.bind = function() {
var __method = this, args = $A(arguments), object = args.shift();
return function() {
  return __method.apply(object, args.concat($A(arguments)));
}
}
Function.prototype.bindAsEventListener = function(object) {
var __method = this;
return function(event) {
  return __method.call(object, event || window.event);
}
}
Object.extend(Number.prototype, {
toColorPart: function() {
  var digits = this.toString(16);
  if (this < 16) return '0' + digits;
  return digits;
},
succ: function() {
  return this + 1;
},
times: function(iterator) {
  $R(0, this, true).each(iterator);
  return this;
}
});
var Try = {
these: function() {
  var returnValue;
  for (var i = 0; i < arguments.length; i++) {
    var lambda = arguments;
    try {
    returnValue = lambda();
    break;
    } catch (e) {}
  }
  return returnValue;
}
}
/*--------------------------------------------------------------------------*/
var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
initialize: function(callback, frequency) {
  this.callback = callback;
  this.frequency = frequency;
  this.currentlyExecuting = false;
  this.registerCallback();
},
registerCallback: function() {
  setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},
onTimerEvent: function() {
  if (!this.currentlyExecuting) {
    try {
    this.currentlyExecuting = true;
    this.callback();
    } finally {
    this.currentlyExecuting = false;
    }
  }
}
}
/*--------------------------------------------------------------------------*/
function $() {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
  var element = arguments;
  if (typeof element == 'string')
    element = document.getElementById(element);
  if (arguments.length == 1)
    return element;
  elements.push(element);
}
return elements;
}
Object.extend(String.prototype, {
stripTags: function() {
  return this.replace(/<\/?[^>]+>/gi, '');
},
stripScripts: function() {
  return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
},
extractScripts: function() {
  var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
  var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
  return (this.match(matchAll) || []).map(function(scriptTag) {
    return (scriptTag.match(matchOne) || ['', ''])[1];
  });
},
evalScripts: function() {
  return this.extractScripts().map(eval);
},
escapeHTML: function() {
  var div = document.createElement('div');
  var text = document.createTextNode(this);
  div.appendChild(text);
  return div.innerHTML;
},
unescapeHTML: function() {
  var div = document.createElement('div');
  div.innerHTML = this.stripTags();
  return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
},
toQueryParams: function() {
  var pairs = this.match(/^\??(.*)$/)[1].split('&');
  return pairs.inject({}, function(params, pairString) {
    var pair = pairString.split('=');
    params[pair[0]] = pair[1];
    return params;
  });
},
toArray: function() {
  return this.split('');
},
camelize: function() {
  var oStringList = this.split('-');
  if (oStringList.length == 1) return oStringList[0];
  var camelizedString = this.indexOf('-') == 0
    ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
    : oStringList[0];
  for (var i = 1, len = oStringList.length; i < len; i++) {
    var s = oStringList;
    camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
  }
  return camelizedString;
},
inspect: function() {
  return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
}
});
String.prototype.parseQuery = String.prototype.toQueryParams;
var $break   = new Object();
var $continue = new Object();
var Enumerable = {
each: function(iterator) {
  var index = 0;
  try {
    this._each(function(value) {
    try {
      iterator(value, index++);
    } catch (e) {
      if (e != $continue) throw e;
    }
    });
  } catch (e) {
    if (e != $break) throw e;
  }
},
all: function(iterator) {
  var result = true;
  this.each(function(value, index) {
    result = result && !!(iterator || Prototype.K)(value, index);
    if (!result) throw $break;
  });
  return result;
},
any: function(iterator) {
  var result = true;
  this.each(function(value, index) {
    if (result = !!(iterator || Prototype.K)(value, index))
    throw $break;
  });
  return result;
},
collect: function(iterator) {
  var results = [];
  this.each(function(value, index) {
    results.push(iterator(value, index));
  });
  return results;
},
detect: function (iterator) {
  var result;
  this.each(function(value, index) {
    if (iterator(value, index)) {
    result = value;
    throw $break;
    }
  });
  return result;
},
findAll: function(iterator) {
  var results = [];
  this.each(function(value, index) {
    if (iterator(value, index))
    results.push(value);
  });
  return results;
},
grep: function(pattern, iterator) {
  var results = [];
  this.each(function(value, index) {
    var stringValue = value.toString();
    if (stringValue.match(pattern))
    results.push((iterator || Prototype.K)(value, index));
  })
  return results;
},
include: function(object) {
  var found = false;
  this.each(function(value) {
    if (value == object) {
    found = true;
    throw $break;
    }
  });
  return found;
},
inject: function(memo, iterator) {
  this.each(function(value, index) {
    memo = iterator(memo, value, index);
  });
  return memo;
},
invoke: function(method) {
  var args = $A(arguments).slice(1);
  return this.collect(function(value) {
    return value[method].apply(value, args);
  });
},
max: function(iterator) {
  var result;
  this.each(function(value, index) {
    value = (iterator || Prototype.K)(value, index);
    if (value >= (result || value))
    result = value;
  });
  return result;
},
min: function(iterator) {
  var result;
  this.each(function(value, index) {
    value = (iterator || Prototype.K)(value, index);
    if (value <= (result || value))
    result = value;
  });
  return result;
},
partition: function(iterator) {
  var trues = [], falses = [];
  this.each(function(value, index) {
    ((iterator || Prototype.K)(value, index) ?
    trues : falses).push(value);
  });
  return [trues, falses];
},
pluck: function(property) {
  var results = [];
  this.each(function(value, index) {
    results.push(value[property]);
  });
  return results;
},
reject: function(iterator) {
  var results = [];
  this.each(function(value, index) {
    if (!iterator(value, index))
    results.push(value);
  });
  return results;
},
sortBy: function(iterator) {
  return this.collect(function(value, index) {
    return {value: value, criteria: iterator(value, index)};
  }).sort(function(left, right) {
    var a = left.criteria, b = right.criteria;
    return a < b ? -1 : a > b ? 1 : 0;
  }).pluck('value');
},
toArray: function() {
  return this.collect(Prototype.K);
},
zip: function() {
  var iterator = Prototype.K, args = $A(arguments);
  if (typeof args.last() == 'function')
    iterator = args.pop();
  var collections = [this].concat(args).map($A);
  return this.map(function(value, index) {
    iterator(value = collections.pluck(index));
    return value;
  });
},
inspect: function() {
  return '#<Enumerable:' + this.toArray().inspect() + '>';
}
}
Object.extend(Enumerable, {
map:   Enumerable.collect,
find:   Enumerable.detect,
select: Enumerable.findAll,
member: Enumerable.include,
entries: Enumerable.toArray
});
var $A = Array.from = function(iterable) {
if (!iterable) return [];
if (iterable.toArray) {
  return iterable.toArray();
} else {
  var results = [];
  for (var i = 0; i < iterable.length; i++)
    results.push(iterable);
  return results;
}
}
Object.extend(Array.prototype, Enumerable);
Array.prototype._reverse = Array.prototype.reverse;
Object.extend(Array.prototype, {
_each: function(iterator) {
  for (var i = 0; i < this.length; i++)
    iterator(this);
},
clear: function() {
  this.length = 0;
  return this;
},
first: function() {
  return this[0];
},
last: function() {
  return this[this.length - 1];
},
compact: function() {
  return this.select(function(value) {
    return value != undefined || value != null;
  });
},
flatten: function() {
  return this.inject([], function(array, value) {
    return array.concat(value.constructor == Array ?
    value.flatten() : [value]);
  });
},
without: function() {
  var values = $A(arguments);
  return this.select(function(value) {
    return !values.include(value);
  });
},
indexOf: function(object) {
  for (var i = 0; i < this.length; i++)
    if (this == object) return i;
  return -1;
},
reverse: function(inline) {
  return (inline !== false ? this : this.toArray())._reverse();
},
shift: function() {
  var result = this[0];
  for (var i = 0; i < this.length - 1; i++)
    this = this[i + 1];
  this.length--;
  return result;
},
inspect: function() {
  return '[' + this.map(Object.inspect).join(', ') + ']';
}
});
var Hash = {
_each: function(iterator) {
  for (key in this) {
    var value = this[key];
    if (typeof value == 'function') continue;
    var pair = [key, value];
    pair.key = key;
    pair.value = value;
    iterator(pair);
  }
},
keys: function() {
  return this.pluck('key');
},
values: function() {
  return this.pluck('value');
},
merge: function(hash) {
  return $H(hash).inject($H(this), function(mergedHash, pair) {
    mergedHash[pair.key] = pair.value;
    return mergedHash;
  });
},
toQueryString: function() {
  return this.map(function(pair) {
    return pair.map(encodeURIComponent).join('=');
  }).join('&');
},
inspect: function() {
  return '#<Hash:{' + this.map(function(pair) {
    return pair.map(Object.inspect).join(': ');
  }).join(', ') + '}>';
}
}
function $H(object) {
var hash = Object.extend({}, object || {});
Object.extend(hash, Enumerable);
Object.extend(hash, Hash);
return hash;
}
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
initialize: function(start, end, exclusive) {
  this.start = start;
  this.end = end;
  this.exclusive = exclusive;
},
_each: function(iterator) {
  var value = this.start;
  do {
    iterator(value);
    value = value.succ();
  } while (this.include(value));
},
include: function(value) {
  if (value < this.start)
    return false;
  if (this.exclusive)
    return value < this.end;
  return value <= this.end;
}
});
var $R = function(start, end, exclusive) {
return new ObjectRange(start, end, exclusive);
}
var Ajax = {
getTransport: function() {
  return Try.these(
    function() {return new ActiveXObject('Msxml2.XMLHTTP')},
    function() {return new ActiveXObject('Microsoft.XMLHTTP')},
    function() {return new XMLHttpRequest()}
  ) || false;
},
activeRequestCount: 0
}
Ajax.Responders = {
responders: [],
_each: function(iterator) {
  this.responders._each(iterator);
},
register: function(responderToAdd) {
  if (!this.include(responderToAdd))
    this.responders.push(responderToAdd);
},
unregister: function(responderToRemove) {
  this.responders = this.responders.without(responderToRemove);
},
dispatch: function(callback, request, transport, json) {
  this.each(function(responder) {
    if (responder[callback] && typeof responder[callback] == 'function') {
    try {
      responder[callback].apply(responder, [request, transport, json]);
    } catch (e) {}
    }
  });
}
};
Object.extend(Ajax.Responders, Enumerable);
Ajax.Responders.register({
onCreate: function() {
  Ajax.activeRequestCount++;
},
onComplete: function() {
  Ajax.activeRequestCount--;
}
});
Ajax.Base = function() {};
Ajax.Base.prototype = {
setOptions: function(options) {
  this.options = {
    method:     'post',
    asynchronous: true,
    parameters:   ''
  }
  Object.extend(this.options, options || {});
},
responseIsSuccess: function() {
  return this.transport.status == undefined
    || this.transport.status == 0
    || (this.transport.status >= 200 && this.transport.status < 300);
},
responseIsFailure: function() {
  return !this.responseIsSuccess();
}
}
Ajax.Request = Class.create();
Ajax.Request.Events =
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
initialize: function(url, options) {
  this.transport = Ajax.getTransport();
  this.setOptions(options);
  this.request(url);
},
request: function(url) {
  var parameters = this.options.parameters || '';
  if (parameters.length > 0) parameters += '&_=';
  try {
    this.url = url;
    if (this.options.method == 'get' && parameters.length > 0)
    this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;
    Ajax.Responders.dispatch('onCreate', this, this.transport);
    this.transport.open(this.options.method, this.url,
    this.options.asynchronous);
    if (this.options.asynchronous) {
    this.transport.onreadystatechange = this.onStateChange.bind(this);
    setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
    }
    this.setRequestHeaders();
    var body = this.options.postBody ? this.options.postBody : parameters;
    this.transport.send(this.options.method == 'post' ? body : null);
  } catch (e) {
    this.dispatchException(e);
  }
},
setRequestHeaders: function() {
  var requestHeaders =
    ['X-Requested-With', 'XMLHttpRequest',
    'X-Prototype-Version', Prototype.Version];
  if (this.options.method == 'post') {
    requestHeaders.push('Content-type',
    'application/x-www-form-urlencoded');
    /* Force "Connection: close" for Mozilla browsers to work around
    * a bug where XMLHttpReqeuest sends an incorrect Content-length
    * header. See Mozilla Bugzilla #246651.
    */
    if (this.transport.overrideMimeType)
    requestHeaders.push('Connection', 'close');
  }
  if (this.options.requestHeaders)
    requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
  for (var i = 0; i < requestHeaders.length; i += 2)
    this.transport.setRequestHeader(requestHeaders, requestHeaders[i+1]);
},
onStateChange: function() {
  var readyState = this.transport.readyState;
  if (readyState != 1)
    this.respondToReadyState(this.transport.readyState);
},
header: function(name) {
  try {
    return this.transport.getResponseHeader(name);
  } catch (e) {}
},
evalJSON: function() {
  try {
    return eval(this.header('X-JSON'));
  } catch (e) {}
},
evalResponse: function() {
  try {
    return eval(this.transport.responseText);
  } catch (e) {
    this.dispatchException(e);
  }
},
respondToReadyState: function(readyState) {
  var event = Ajax.Request.Events[readyState];
  var transport = this.transport, json = this.evalJSON();
  if (event == 'Complete') {
    try {
    (this.options['on' + this.transport.status]
      || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
      || Prototype.emptyFunction)(transport, json);
    } catch (e) {
    this.dispatchException(e);
    }
    if ((this.header('Content-type') || '').match(/^text\/javascript/i))
    this.evalResponse();
  }
  try {
    (this.options['on' + event] || Prototype.emptyFunction)(transport, json);
    Ajax.Responders.dispatch('on' + event, this, transport, json);
  } catch (e) {
    this.dispatchException(e);
  }
  /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
  if (event == 'Complete')
    this.transport.onreadystatechange = Prototype.emptyFunction;
},
dispatchException: function(exception) {
  (this.options.onException || Prototype.emptyFunction)(this, exception);
  Ajax.Responders.dispatch('onException', this, exception);
}
});
Ajax.Updater = Class.create();
Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
initialize: function(container, url, options) {
  this.containers = {
    success: container.success ? $(container.success) : $(container),
    failure: container.failure ? $(container.failure) :
    (container.success ? null : $(container))
  }
  this.transport = Ajax.getTransport();
  this.setOptions(options);
  var onComplete = this.options.onComplete || Prototype.emptyFunction;
  this.options.onComplete = (function(transport, object) {
    this.updateContent();
    onComplete(transport, object);
  }).bind(this);
  this.request(url);
},
updateContent: function() {
  var receiver = this.responseIsSuccess() ?
    this.containers.success : this.containers.failure;
  var response = this.transport.responseText;
  if (!this.options.evalScripts)
    response = response.stripScripts();
  if (receiver) {
    if (this.options.insertion) {
    new this.options.insertion(receiver, response);
    } else {
    Element.update(receiver, response);
    }
  }
  if (this.responseIsSuccess()) {
    if (this.onComplete)
    setTimeout(this.onComplete.bind(this), 10);
  }
}
});
Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
initialize: function(container, url, options) {
  this.setOptions(options);
  this.onComplete = this.options.onComplete;
  this.frequency = (this.options.frequency || 2);
  this.decay = (this.options.decay || 1);
  this.updater = {};
  this.container = container;
  this.url = url;
  this.start();
},
start: function() {
  this.options.onComplete = this.updateComplete.bind(this);
  this.onTimerEvent();
},
stop: function() {
  this.updater.onComplete = undefined;
  clearTimeout(this.timer);
  (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
},
updateComplete: function(request) {
  if (this.options.decay) {
    this.decay = (request.responseText == this.lastText ?
    this.decay * this.options.decay : 1);
    this.lastText = request.responseText;
  }
  this.timer = setTimeout(this.onTimerEvent.bind(this),
    this.decay * this.frequency * 1000);
},
onTimerEvent: function() {
  this.updater = new Ajax.Updater(this.container, this.url, this.options);
}
});
document.getElementsByClassName = function(className, parentElement) {
var children = ($(parentElement) || document.body).getElementsByTagName('*');
return $A(children).inject([], function(elements, child) {
  if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
    elements.push(child);
  return elements;
});
}
/*--------------------------------------------------------------------------*/
if (!window.Element) {
var Element = new Object();
}
Object.extend(Element, {
visible: function(element) {
  return $(element).style.display != 'none';
},
toggle: function() {
  for (var i = 0; i < arguments.length; i++) {
    var element = $(arguments);
    Element[Element.visible(element) ? 'hide' : 'show'](element);
  }
},
hide: function() {
  for (var i = 0; i < arguments.length; i++) {
    var element = $(arguments);
    element.style.display = 'none';
  }
},
show: function() {
  for (var i = 0; i < arguments.length; i++) {
    var element = $(arguments);
    element.style.display = '';
  }
},
remove: function(element) {
  element = $(element);
  element.parentNode.removeChild(element);
},
update: function(element, html) {
  $(element).innerHTML = html.stripScripts();
  setTimeout(function() {html.evalScripts()}, 10);
},
getHeight: function(element) {
  element = $(element);
  return element.offsetHeight;
},
classNames: function(element) {
  return new Element.ClassNames(element);
},
hasClassName: function(element, className) {
  if (!(element = $(element))) return;
  return Element.classNames(element).include(className);
},
addClassName: function(element, className) {
  if (!(element = $(element))) return;
  return Element.classNames(element).add(className);
},
removeClassName: function(element, className) {
  if (!(element = $(element))) return;
  return Element.classNames(element).remove(className);
},
// removes whitespace-only text node children
cleanWhitespace: function(element) {
  element = $(element);
  for (var i = 0; i < element.childNodes.length; i++) {
    var node = element.childNodes;
    if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
    Element.remove(node);
  }
},
empty: function(element) {
  return $(element).innerHTML.match(/^\s*$/);
},
scrollTo: function(element) {
  element = $(element);
  var x = element.x ? element.x : element.offsetLeft,
    y = element.y ? element.y : element.offsetTop;
  window.scrollTo(x, y);
},
getStyle: function(element, style) {
  element = $(element);
  var value = element.style[style.camelize()];
  if (!value) {
    if (document.defaultView && document.defaultView.getComputedStyle) {
    var css = document.defaultView.getComputedStyle(element, null);
    value = css ? css.getPropertyValue(style) : null;
    } else if (element.currentStyle) {
    value = element.currentStyle[style.camelize()];
    }
  }
  if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
    if (Element.getStyle(element, 'position') == 'static') value = 'auto';
  return value == 'auto' ? null : value;
},
setStyle: function(element, style) {
  element = $(element);
  for (name in style)
    element.style[name.camelize()] = style[name];
},
getDimensions: function(element) {
  element = $(element);
  if (Element.getStyle(element, 'display') != 'none')
    return {width: element.offsetWidth, height: element.offsetHeight};
  // All *Width and *Height properties give 0 on elements with display none,
  // so enable the element temporarily
  var els = element.style;
  var originalVisibility = els.visibility;
  var originalPosition = els.position;
  els.visibility = 'hidden';
  els.position = 'absolute';
  els.display = '';
  var originalWidth = element.clientWidth;
  var originalHeight = element.clientHeight;
  els.display = 'none';
  els.position = originalPosition;
  els.visibility = originalVisibility;
  return {width: originalWidth, height: originalHeight};
},
makePositioned: function(element) {
  element = $(element);
  var pos = Element.getStyle(element, 'position');
  if (pos == 'static' || !pos) {
    element._madePositioned = true;
    element.style.position = 'relative';
    // Opera returns the offset relative to the positioning context, when an
    // element is position relative but top and left have not been defined
    if (window.opera) {
    element.style.top = 0;
    element.style.left = 0;
    }
  }
},
undoPositioned: function(element) {
  element = $(element);
  if (element._madePositioned) {
    element._madePositioned = undefined;
    element.style.position =
    element.style.top =
    element.style.left =
    element.style.bottom =
    element.style.right = '';
  }
},
makeClipping: function(element) {
  element = $(element);
  if (element._overflow) return;
  element._overflow = element.style.overflow;
  if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
    element.style.overflow = 'hidden';
},
undoClipping: function(element) {
  element = $(element);
  if (element._overflow) return;
  element.style.overflow = element._overflow;
  element._overflow = undefined;
}
});
var Toggle = new Object();
Toggle.display = Element.toggle;
/*--------------------------------------------------------------------------*/
Abstract.Insertion = function(adjacency) {
this.adjacency = adjacency;
}
Abstract.Insertion.prototype = {
initialize: function(element, content) {
  this.element = $(element);
  this.content = content.stripScripts();
  if (this.adjacency && this.element.insertAdjacentHTML) {
    try {
    this.element.insertAdjacentHTML(this.adjacency, this.content);
    } catch (e) {
    if (this.element.tagName.toLowerCase() == 'tbody') {
      this.insertContent(this.contentFromAnonymousTable());
    } else {
      throw e;
    }
    }
  } else {
    this.range = this.element.ownerDocument.createRange();
    if (this.initializeRange) this.initializeRange();
    this.insertContent([this.range.createContextualFragment(this.content)]);
  }
  setTimeout(function() {content.evalScripts()}, 10);
},
contentFromAnonymousTable: function() {
  var div = document.createElement('div');
  div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
  return $A(div.childNodes[0].childNodes[0].childNodes);
}
}
var Insertion = new Object();
Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
initializeRange: function() {
  this.range.setStartBefore(this.element);
},
insertContent: function(fragments) {
  fragments.each((function(fragment) {
    this.element.parentNode.insertBefore(fragment, this.element);
  }).bind(this));
}
});
Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
initializeRange: function() {
  this.range.selectNodeContents(this.element);
  this.range.collapse(true);
},
insertContent: function(fragments) {
  fragments.reverse(false).each((function(fragment) {
    this.element.insertBefore(fragment, this.element.firstChild);
  }).bind(this));
}
});
Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
initializeRange: function() {
  this.range.selectNodeContents(this.element);
  this.range.collapse(this.element);
},
insertContent: function(fragments) {
  fragments.each((function(fragment) {
    this.element.appendChild(fragment);
  }).bind(this));
}
});
Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
initializeRange: function() {
  this.range.setStartAfter(this.element);
},
insertContent: function(fragments) {
  fragments.each((function(fragment) {
    this.element.parentNode.insertBefore(fragment,
    this.element.nextSibling);
  }).bind(this));
}
});
/*--------------------------------------------------------------------------*/
Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
initialize: function(element) {
  this.element = $(element);
},
_each: function(iterator) {
  this.element.className.split(/\s+/).select(function(name) {
    return name.length > 0;
  })._each(iterator);
},
set: function(className) {
  this.element.className = className;
},
add: function(classNameToAdd) {
  if (this.include(classNameToAdd)) return;
  this.set(this.toArray().concat(classNameToAdd).join(' '));
},
remove: function(classNameToRemove) {
  if (!this.include(classNameToRemove)) return;
  this.set(this.select(function(className) {
    return className != classNameToRemove;
  }).join(' '));
},
toString: function() {
  return this.toArray().join(' ');
}
}
Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
clear: function() {
  for (var i = 0; i < arguments.length; i++)
    $(arguments).value = '';
},
focus: function(element) {
  $(element).focus();
},
present: function() {
  for (var i = 0; i < arguments.length; i++)
    if ($(arguments).value == '') return false;
  return true;
},
select: function(element) {
  $(element).select();
},
activate: function(element) {
  element = $(element);
  element.focus();
  if (element.select)
    element.select();
}
}
/*--------------------------------------------------------------------------*/
var Form = {
serialize: function(form) {
  var elements = Form.getElements($(form));
  var queryComponents = new Array();
  for (var i = 0; i < elements.length; i++) {
    var queryComponent = Form.Element.serialize(elements);
    if (queryComponent)
    queryComponents.push(queryComponent);
  }
  return queryComponents.join('&');
},
getElements: function(form) {
  form = $(form);
  var elements = new Array();
  for (tagName in Form.Element.Serializers) {
    var tagElements = form.getElementsByTagName(tagName);
    for (var j = 0; j < tagElements.length; j++)
    elements.push(tagElements[j]);
  }
  return elements;
},
getInputs: function(form, typeName, name) {
  form = $(form);
  var inputs = form.getElementsByTagName('input');
  if (!typeName && !name)
    return inputs;
  var matchingInputs = new Array();
  for (var i = 0; i < inputs.length; i++) {
    var input = inputs;
    if ((typeName && input.type != typeName) ||
      (name && input.name != name))
    continue;
    matchingInputs.push(input);
  }
  return matchingInputs;
},
disable: function(form) {
  var elements = Form.getElements(form);
  for (var i = 0; i < elements.length; i++) {
    var element = elements;
    element.blur();
    element.disabled = 'true';
  }
},
enable: function(form) {
  var elements = Form.getElements(form);
  for (var i = 0; i < elements.length; i++) {
    var element = elements;
    element.disabled = '';
  }
},
findFirstElement: function(form) {
  return Form.getElements(form).find(function(element) {
    return element.type != 'hidden' && !element.disabled &&
    ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
  });
},
focusFirstElement: function(form) {
  Field.activate(Form.findFirstElement(form));
},
reset: function(form) {
  $(form).reset();
}
}
Form.Element = {
serialize: function(element) {
  element = $(element);
  var method = element.tagName.toLowerCase();
  var parameter = Form.Element.Serializers[method](element);
  if (parameter) {
    var key = encodeURIComponent(parameter[0]);
    if (key.length == 0) return;
    if (parameter[1].constructor != Array)
    parameter[1] = [parameter[1]];
    return parameter[1].map(function(value) {
    return key + '=' + encodeURIComponent(value);
    }).join('&');
  }
},
getValue: function(element) {
  element = $(element);
  var method = element.tagName.toLowerCase();
  var parameter = Form.Element.Serializers[method](element);
  if (parameter)
    return parameter[1];
}
}
Form.Element.Serializers = {
input: function(element) {
  switch (element.type.toLowerCase()) {
    case 'submit':
    case 'hidden':
    case 'password':
    case 'text':
    return Form.Element.Serializers.textarea(element);
    case 'checkbox':
    case 'radio':
    return Form.Element.Serializers.inputSelector(element);
  }
  return false;
},
inputSelector: function(element) {
  if (element.checked)
    return [element.name, element.value];
},
textarea: function(element) {
  return [element.name, element.value];
},
select: function(element) {
  return Form.Element.Serializers[element.type == 'select-one' ?
    'selectOne' : 'selectMany'](element);
},
selectOne: function(element) {
  var value = '', opt, index = element.selectedIndex;
  if (index >= 0) {
    opt = element.options[index];
    value = opt.value;
    if (!value && !('value' in opt))
    value = opt.text;
  }
  return [element.name, value];
},
selectMany: function(element) {
  var value = new Array();
  for (var i = 0; i < element.length; i++) {
    var opt = element.options;
    if (opt.selected) {
    var optValue = opt.value;
    if (!optValue && !('value' in opt))
      optValue = opt.text;
    value.push(optValue);
    }
  }
  return [element.name, value];
}
}
/*--------------------------------------------------------------------------*/
var $F = Form.Element.getValue;
/*--------------------------------------------------------------------------*/
Abstract.TimedObserver = function() {}
Abstract.TimedObserver.prototype = {
initialize: function(element, frequency, callback) {
  this.frequency = frequency;
  this.element   = $(element);
  this.callback = callback;
  this.lastValue = this.getValue();
  this.registerCallback();
},
registerCallback: function() {
  setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},
onTimerEvent: function() {
  var value = this.getValue();
  if (this.lastValue != value) {
    this.callback(this.element, value);
    this.lastValue = value;
  }
}
}
Form.Element.Observer = Class.create();
Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
  return Form.Element.getValue(this.element);
}
});
Form.Observer = Class.create();
Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
  return Form.serialize(this.element);
}
});
/*--------------------------------------------------------------------------*/
Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
initialize: function(element, callback) {
  this.element = $(element);
  this.callback = callback;
  this.lastValue = this.getValue();
  if (this.element.tagName.toLowerCase() == 'form')
    this.registerFormCallbacks();
  else
    this.registerCallback(this.element);
},
onElementEvent: function() {
  var value = this.getValue();
  if (this.lastValue != value) {
    this.callback(this.element, value);
    this.lastValue = value;
  }
},
registerFormCallbacks: function() {
  var elements = Form.getElements(this.element);
  for (var i = 0; i < elements.length; i++)
    this.registerCallback(elements);
},
registerCallback: function(element) {
  if (element.type) {
    switch (element.type.toLowerCase()) {
    case 'checkbox':
    case 'radio':
      Event.observe(element, 'click', this.onElementEvent.bind(this));
      break;
    case 'password':
    case 'text':
    case 'textarea':
    case 'select-one':
    case 'select-multiple':
      Event.observe(element, 'change', this.onElementEvent.bind(this));
      break;
    }
  }
}
}
Form.Element.EventObserver = Class.create();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
  return Form.Element.getValue(this.element);
}
});
Form.EventObserver = Class.create();
Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
  return Form.serialize(this.element);
}
});
if (!window.Event) {
var Event = new Object();
}
Object.extend(Event, {
KEY_BACKSPACE: 8,
KEY_TAB:     9,
KEY_RETURN:   13,
KEY_ESC:     27,
KEY_LEFT:   37,
KEY_UP:     38,
KEY_RIGHT:   39,
KEY_DOWN:   40,
KEY_DELETE:   46,
element: function(event) {
  return event.target || event.srcElement;
},
isLeftClick: function(event) {
  return (((event.which) && (event.which == 1)) ||
        ((event.button) && (event.button == 1)));
},
pointerX: function(event) {
  return event.pageX || (event.clientX +
    (document.documentElement.scrollLeft || document.body.scrollLeft));
},
pointerY: function(event) {
  return event.pageY || (event.clientY +
    (document.documentElement.scrollTop || document.body.scrollTop));
},
stop: function(event) {
  if (event.preventDefault) {
    event.preventDefault();
    event.stopPropagation();
  } else {
    event.returnValue = false;
    event.cancelBubble = true;
  }
},
// find the first node with the given tagName, starting from the
// node the event was triggered on; traverses the DOM upwards
findElement: function(event, tagName) {
  var element = Event.element(event);
  while (element.parentNode && (!element.tagName ||
    (element.tagName.toUpperCase() != tagName.toUpperCase())))
    element = element.parentNode;
  return element;
},
observers: false,
_observeAndCache: function(element, name, observer, useCapture) {
  if (!this.observers) this.observers = [];
  if (element.addEventListener) {
    this.observers.push([element, name, observer, useCapture]);
    element.addEventListener(name, observer, useCapture);
  } else if (element.attachEvent) {
    this.observers.push([element, name, observer, useCapture]);
    element.attachEvent('on' + name, observer);
  }
},
unloadCache: function() {
  if (!Event.observers) return;
  for (var i = 0; i < Event.observers.length; i++) {
    Event.stopObserving.apply(this, Event.observers);
    Event.observers[0] = null;
  }
  Event.observers = false;
},
observe: function(element, name, observer, useCapture) {
  var element = $(element);
  useCapture = useCapture || false;
  if (name == 'keypress' &&
    (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
    || element.attachEvent))
    name = 'keydown';
  this._observeAndCache(element, name, observer, useCapture);
},
stopObserving: function(element, name, observer, useCapture) {
  var element = $(element);
  useCapture = useCapture || false;
  if (name == 'keypress' &&
    (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
    || element.detachEvent))
    name = 'keydown';
  if (element.removeEventListener) {
    element.removeEventListener(name, observer, useCapture);
  } else if (element.detachEvent) {
    element.detachEvent('on' + name, observer);
  }
}
});
/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);
var Position = {
// set to true if needed, warning: firefox performance problems
// NOT neeeded for page scrolling, only if draggable contained in
// scrollable elements
includeScrollOffsets: false,
// must be called before calling withinIncludingScrolloffset, every time the
// page is scrolled
prepare: function() {
  this.deltaX = window.pageXOffset
          || document.documentElement.scrollLeft
          || document.body.scrollLeft
          || 0;
  this.deltaY = window.pageYOffset
          || document.documentElement.scrollTop
          || document.body.scrollTop
          || 0;
},
realOffset: function(element) {
  var valueT = 0, valueL = 0;
  do {
    valueT += element.scrollTop || 0;
    valueL += element.scrollLeft || 0;
    element = element.parentNode;
  } while (element);
  return [valueL, valueT];
},
cumulativeOffset: function(element) {
  var valueT = 0, valueL = 0;
  do {
    valueT += element.offsetTop || 0;
    valueL += element.offsetLeft || 0;
    element = element.offsetParent;
  } while (element);
  return [valueL, valueT];
},
positionedOffset: function(element) {
  var valueT = 0, valueL = 0;
  do {
    valueT += element.offsetTop || 0;
    valueL += element.offsetLeft || 0;
    element = element.offsetParent;
    if (element) {
    p = Element.getStyle(element, 'position');
    if (p == 'relative' || p == 'absolute') break;
    }
  } while (element);
  return [valueL, valueT];
},
offsetParent: function(element) {
  if (element.offsetParent) return element.offsetParent;
  if (element == document.body) return element;
  while ((element = element.parentNode) && element != document.body)
    if (Element.getStyle(element, 'position') != 'static')
    return element;
  return document.body;
},
// caches x/y coordinate pair to use with overlap
within: function(element, x, y) {
  if (this.includeScrollOffsets)
    return this.withinIncludingScrolloffsets(element, x, y);
  this.xcomp = x;
  this.ycomp = y;
  this.offset = this.cumulativeOffset(element);
  return (y >= this.offset[1] &&
        y < this.offset[1] + element.offsetHeight &&
        x >= this.offset[0] &&
        x < this.offset[0] + element.offsetWidth);
},
withinIncludingScrolloffsets: function(element, x, y) {
  var offsetcache = this.realOffset(element);
  this.xcomp = x + offsetcache[0] - this.deltaX;
  this.ycomp = y + offsetcache[1] - this.deltaY;
  this.offset = this.cumulativeOffset(element);
  return (this.ycomp >= this.offset[1] &&
        this.ycomp < this.offset[1] + element.offsetHeight &&
        this.xcomp >= this.offset[0] &&
        this.xcomp < this.offset[0] + element.offsetWidth);
},
// within must be called directly before
overlap: function(mode, element) {
  if (!mode) return 0;
  if (mode == 'vertical')
    return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
    element.offsetHeight;
  if (mode == 'horizontal')
    return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
    element.offsetWidth;
},
clone: function(source, target) {
  source = $(source);
  target = $(target);
  target.style.position = 'absolute';
  var offsets = this.cumulativeOffset(source);
  target.style.top   = offsets[1] + 'px';
  target.style.left   = offsets[0] + 'px';
  target.style.width = source.offsetWidth + 'px';
  target.style.height = source.offsetHeight + 'px';
},
page: function(forElement) {
  var valueT = 0, valueL = 0;
  var element = forElement;
  do {
    valueT += element.offsetTop || 0;
    valueL += element.offsetLeft || 0;
    // Safari fix
    if (element.offsetParent==document.body)
    if (Element.getStyle(element,'position')=='absolute') break;
  } while (element = element.offsetParent);
  element = forElement;
  do {
    valueT -= element.scrollTop || 0;
    valueL -= element.scrollLeft || 0;
  } while (element = element.parentNode);
  return [valueL, valueT];
},
clone: function(source, target) {
  var options = Object.extend({
    setLeft:   true,
    setTop:   true,
    setWidth:   true,
    setHeight: true,
    offsetTop: 0,
    offsetLeft: 0
  }, arguments[2] || {})
  // find page position of source
  source = $(source);
  var p = Position.page(source);
  // find coordinate system to use
  target = $(target);
  var delta = [0, 0];
  var parent = null;
  // delta [0,0] will do fine with position: fixed elements,
  // position:absolute needs offsetParent deltas
  if (Element.getStyle(target,'position') == 'absolute') {
    parent = Position.offsetParent(target);
    delta = Position.page(parent);
  }
  // correct by body offsets (fixes Safari)
  if (parent == document.body) {
    delta[0] -= document.body.offsetLeft;
    delta[1] -= document.body.offsetTop;
  }
  // set position
  if(options.setLeft)   target.style.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
  if(options.setTop)   target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
  if(options.setWidth) target.style.width = source.offsetWidth + 'px';
  if(options.setHeight) target.style.height = source.offsetHeight + 'px';
},
absolutize: function(element) {
  element = $(element);
  if (element.style.position == 'absolute') return;
  Position.prepare();
  var offsets = Position.positionedOffset(element);
  var top   = offsets[1];
  var left   = offsets[0];
  var width   = element.clientWidth;
  var height = element.clientHeight;
  element._originalLeft   = left - parseFloat(element.style.left || 0);
  element._originalTop   = top - parseFloat(element.style.top || 0);
  element._originalWidth = element.style.width;
  element._originalHeight = element.style.height;
  element.style.position = 'absolute';
  element.style.top   = top + 'px';;
  element.style.left   = left + 'px';;
  element.style.width = width + 'px';;
  element.style.height = height + 'px';;
},
relativize: function(element) {
  element = $(element);
  if (element.style.position == 'relative') return;
  Position.prepare();
  element.style.position = 'relative';
  var top = parseFloat(element.style.top || 0) - (element._originalTop || 0);
  var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
  element.style.top   = top + 'px';
  element.style.left   = left + 'px';
  element.style.height = element._originalHeight;
  element.style.width = element._originalWidth;
}
}
// Safari returns margins on body which is incorrect if the child is absolutely
// positioned. For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
Position.cumulativeOffset = function(element) {
  var valueT = 0, valueL = 0;
  do {
    valueT += element.offsetTop || 0;
    valueL += element.offsetLeft || 0;
    if (element.offsetParent == document.body)
    if (Element.getStyle(element, 'position') == 'absolute') break;
    element = element.offsetParent;
  } while (element);
  return [valueL, valueT];
}
}