Subversion-Projekte lars-tiefland.prado

// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)

//           (c) 2005 Ivan Krstic (http://blogs.law.harvard.edu/ivan)

//           (c) 2005 Jon Tirsen (http://www.tirsen.com)

// Contributors:

//  Richard Livsey

//  Rahul Bhargava

//  Rob Wills

//

// See scriptaculous.js for full license.

// Autocompleter.Base handles all the autocompletion functionality

// that's independent of the data source for autocompletion. This

// includes drawing the autocompletion menu, observing keyboard

// and mouse events, and similar.

//

// Specific autocompleters need to provide, at the very least,

// a getUpdatedChoices function that will be invoked every time

// the text inside the monitored textbox changes. This method

// should get the text for which to provide autocompletion by

// invoking this.getToken(), NOT by directly accessing

// this.element.value. This is to allow incremental tokenized

// autocompletion. Specific auto-completion logic (AJAX, etc)

// belongs in getUpdatedChoices.

//

// Tokenized incremental autocompletion is enabled automatically

// when an autocompleter is instantiated with the 'tokens' option

// in the options parameter, e.g.:

// new Ajax.Autocompleter('id','upd', '/url/', { tokens: ',' });

// will incrementally autocomplete with a comma as the token.

// Additionally, ',' in the above example can be replaced with

// a token array, e.g. { tokens: [',', '\n'] } which

// enables autocompletion on multiple tokens. This is most

// useful when one of the tokens is \n (a newline), as it

// allows smart autocompletion after linebreaks.

var Autocompleter = {}

Autocompleter.Base = function() {};

Autocompleter.Base.prototype = {

  baseInitialize: function(element, update, options) {

    this.element     = $(element);

    this.update      = $(update);

    this.hasFocus    = false;

    this.changed     = false;

    this.active      = false;

    this.index       = 0;

    this.entryCount  = 0;

    if (this.setOptions)

      this.setOptions(options);

    else

      this.options = options || {};

    this.options.paramName    = this.options.paramName || this.element.name;

    this.options.tokens       = this.options.tokens || [];

    this.options.frequency    = this.options.frequency || 0.4;

    this.options.minChars     = this.options.minChars || 1;

    this.options.onShow       = this.options.onShow ||

    function(element, update){

      if(!update.style.position || update.style.position=='absolute') {

        update.style.position = 'absolute';

        Position.clone(element, update, {setHeight: false, offsetTop: element.offsetHeight});

      }

      Effect.Appear(update,{duration:0.15});

    };

    this.options.onHide = this.options.onHide ||

    function(element, update){ new Effect.Fade(update,{duration:0.15}) };

    if (typeof(this.options.tokens) == 'string')

      this.options.tokens = new Array(this.options.tokens);

    this.observer = null;

    this.element.setAttribute('autocomplete','off');

    Element.hide(this.update);

    Event.observe(this.element, "blur", this.onBlur.bindAsEventListener(this));

    Event.observe(this.element, "keypress", this.onKeyPress.bindAsEventListener(this));

  },

  show: function() {

    if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);

    if(!this.iefix &&

      (navigator.appVersion.indexOf('MSIE')>0) &&

      (navigator.userAgent.indexOf('Opera')<0) &&

      (Element.getStyle(this.update, 'position')=='absolute')) {

      new Insertion.After(this.update,

       '<iframe id="' + this.update.id + '_iefix" '+

       'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +

       'src="javascript:false;" frameborder="0" scrolling="no"></iframe>');

      this.iefix = $(this.update.id+'_iefix');

    }

    if(this.iefix) setTimeout(this.fixIEOverlapping.bind(this), 50);

  },

  fixIEOverlapping: function() {

    Position.clone(this.update, this.iefix);

    this.iefix.style.zIndex = 1;

    this.update.style.zIndex = 2;

    Element.show(this.iefix);

  },

  hide: function() {

    this.stopIndicator();

    if(Element.getStyle(this.update, 'display')!='none') this.options.onHide(this.element, this.update);

    if(this.iefix) Element.hide(this.iefix);

  },

  startIndicator: function() {

    if(this.options.indicator) Element.show(this.options.indicator);

  },

  stopIndicator: function() {

    if(this.options.indicator) Element.hide(this.options.indicator);

  },

  onKeyPress: function(event) {

    if(this.active)

      switch(event.keyCode) {

       case Event.KEY_TAB:

       case Event.KEY_RETURN:

         this.selectEntry();

         Event.stop(event);

       case Event.KEY_ESC:

         this.hide();

         this.active = false;

         Event.stop(event);

         return;

       case Event.KEY_LEFT:

       case Event.KEY_RIGHT:

         return;

       case Event.KEY_UP:

         this.markPrevious();

         this.render();

         if(navigator.appVersion.indexOf('AppleWebKit')>0) Event.stop(event);

         return;

       case Event.KEY_DOWN:

         this.markNext();

         this.render();

         if(navigator.appVersion.indexOf('AppleWebKit')>0) Event.stop(event);

         return;

      }

     else

       if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN ||

         (navigator.appVersion.indexOf('AppleWebKit') > 0 && event.keyCode == 0)) return;

    this.changed = true;

    this.hasFocus = true;

    if(this.observer) clearTimeout(this.observer);

      this.observer =

        setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000);

  },

  activate: function() {

    this.changed = false;

    this.hasFocus = true;

    this.getUpdatedChoices();

  },

  onHover: function(event) {

    var element = Event.findElement(event, 'LI');

    if(this.index != element.autocompleteIndex)

    {

        this.index = element.autocompleteIndex;

        this.render();

    }

    Event.stop(event);

  },

  onClick: function(event) {

    var element = Event.findElement(event, 'LI');

    this.index = element.autocompleteIndex;

    this.selectEntry();

    this.hide();

  },

  onBlur: function(event) {

    // needed to make click events working

    setTimeout(this.hide.bind(this), 250);

    this.hasFocus = false;

    this.active = false;

  },

  render: function() {

    if(this.entryCount > 0) {

      for (var i = 0; i < this.entryCount; i++)

        this.index==i ?

          Element.addClassName(this.getEntry(i),"selected") :

          Element.removeClassName(this.getEntry(i),"selected");

      if(this.hasFocus) {

        this.show();

        this.active = true;

      }

    } else {

      this.active = false;

      this.hide();

    }

  },

  markPrevious: function() {

    if(this.index > 0) this.index--

      else this.index = this.entryCount-1;

  },

  markNext: function() {

    if(this.index < this.entryCount-1) this.index++

      else this.index = 0;

  },

  getEntry: function(index) {

    return this.update.firstChild.childNodes[index];

  },

  getCurrentEntry: function() {

    return this.getEntry(this.index);

  },

  selectEntry: function() {

    this.active = false;

    this.updateElement(this.getCurrentEntry());

  },

  updateElement: function(selectedElement) {

    if (this.options.updateElement) {

      this.options.updateElement(selectedElement);

      return;

    }

    var value = '';

    if (this.options.select) {

      var nodes = document.getElementsByClassName(this.options.select, selectedElement) || [];

      if(nodes.length>0) value = Element.collectTextNodes(nodes[0], this.options.select);

    } else

      value = Element.collectTextNodesIgnoreClass(selectedElement, 'informal');

    var lastTokenPos = this.findLastToken();

    if (lastTokenPos != -1) {

      var newValue = this.element.value.substr(0, lastTokenPos + 1);

      var whitespace = this.element.value.substr(lastTokenPos + 1).match(/^\s+/);

      if (whitespace)

        newValue += whitespace[0];

      this.element.value = newValue + value;

    } else {

      this.element.value = value;

    }

    this.element.focus();

    if (this.options.afterUpdateElement)

      this.options.afterUpdateElement(this.element, selectedElement);

  },

  updateChoices: function(choices) {

    if(!this.changed && this.hasFocus) {

      this.update.innerHTML = choices;

      Element.cleanWhitespace(this.update);

      Element.cleanWhitespace(this.update.firstChild);

      if(this.update.firstChild && this.update.firstChild.childNodes) {

        this.entryCount =

          this.update.firstChild.childNodes.length;

        for (var i = 0; i < this.entryCount; i++) {

          var entry = this.getEntry(i);

          entry.autocompleteIndex = i;

          this.addObservers(entry);

        }

      } else {

        this.entryCount = 0;

      }

      this.stopIndicator();

      this.index = 0;

      this.render();

    }

  },

  addObservers: function(element) {

    Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this));

    Event.observe(element, "click", this.onClick.bindAsEventListener(this));

  },

  onObserverEvent: function() {

    this.changed = false;

    if(this.getToken().length>=this.options.minChars) {

      this.startIndicator();

      this.getUpdatedChoices();

    } else {

      this.active = false;

      this.hide();

    }

  },

  getToken: function() {

    var tokenPos = this.findLastToken();

    if (tokenPos != -1)

      var ret = this.element.value.substr(tokenPos + 1).replace(/^\s+/,'').replace(/\s+$/,'');

    else

      var ret = this.element.value;

    return /\n/.test(ret) ? '' : ret;

  },

  findLastToken: function() {

    var lastTokenPos = -1;

    for (var i=0; i<this.options.tokens.length; i++) {

      var thisTokenPos = this.element.value.lastIndexOf(this.options.tokens[i]);

      if (thisTokenPos > lastTokenPos)

        lastTokenPos = thisTokenPos;

    }

    return lastTokenPos;

  }

}

Ajax.Autocompleter = Class.create();

Object.extend(Object.extend(Ajax.Autocompleter.prototype, Autocompleter.Base.prototype), {

  initialize: function(element, update, url, options) {

    this.baseInitialize(element, update, options);

    this.options.asynchronous  = true;

    this.options.onComplete    = this.onComplete.bind(this);

    this.options.defaultParams = this.options.parameters || null;

    this.url                   = url;

  },

  getUpdatedChoices: function() {

    entry = encodeURIComponent(this.options.paramName) + '=' +

      encodeURIComponent(this.getToken());

    this.options.parameters = this.options.callback ?

      this.options.callback(this.element, entry) : entry;

    if(this.options.defaultParams)

      this.options.parameters += '&' + this.options.defaultParams;

    new Ajax.Request(this.url, this.options);

  },

  onComplete: function(request) {

    this.updateChoices(request.responseText);

  }

});

// The local array autocompleter. Used when you'd prefer to

// inject an array of autocompletion options into the page, rather

// than sending out Ajax queries, which can be quite slow sometimes.

//

// The constructor takes four parameters. The first two are, as usual,

// the id of the monitored textbox, and id of the autocompletion menu.

// The third is the array you want to autocomplete from, and the fourth

// is the options block.

//

// Extra local autocompletion options:

// - choices - How many autocompletion choices to offer

//

// - partialSearch - If false, the autocompleter will match entered

//                    text only at the beginning of strings in the

//                    autocomplete array. Defaults to true, which will

//                    match text at the beginning of any *word* in the

//                    strings in the autocomplete array. If you want to

//                    search anywhere in the string, additionally set

//                    the option fullSearch to true (default: off).

//

// - fullSsearch - Search anywhere in autocomplete array strings.

//

// - partialChars - How many characters to enter before triggering

//                   a partial match (unlike minChars, which defines

//                   how many characters are required to do any match

//                   at all). Defaults to 2.

//

// - ignoreCase - Whether to ignore case when autocompleting.

//                 Defaults to true.

//

// It's possible to pass in a custom function as the 'selector'

// option, if you prefer to write your own autocompletion logic.

// In that case, the other options above will not apply unless

// you support them.

Autocompleter.Local = Class.create();

Autocompleter.Local.prototype = Object.extend(new Autocompleter.Base(), {

  initialize: function(element, update, array, options) {

    this.baseInitialize(element, update, options);

    this.options.array = array;

  },

  getUpdatedChoices: function() {

    this.updateChoices(this.options.selector(this));

  },

  setOptions: function(options) {

    this.options = Object.extend({

      choices: 10,

      partialSearch: true,

      partialChars: 2,

      ignoreCase: true,

      fullSearch: false,

      selector: function(instance) {

        var ret       = []; // Beginning matches

        var partial   = []; // Inside matches

        var entry     = instance.getToken();

        var count     = 0;

        for (var i = 0; i < instance.options.array.length &&

          ret.length < instance.options.choices ; i++) {

          var elem = instance.options.array[i];

          var foundPos = instance.options.ignoreCase ?

            elem.toLowerCase().indexOf(entry.toLowerCase()) :

            elem.indexOf(entry);

          while (foundPos != -1) {

            if (foundPos == 0 && elem.length != entry.length) {

              ret.push("<li><strong>" + elem.substr(0, entry.length) + "</strong>" +

                elem.substr(entry.length) + "</li>");

              break;

            } else if (entry.length >= instance.options.partialChars &&

              instance.options.partialSearch && foundPos != -1) {

              if (instance.options.fullSearch || /\s/.test(elem.substr(foundPos-1,1))) {

                partial.push("<li>" + elem.substr(0, foundPos) + "<strong>" +

                  elem.substr(foundPos, entry.length) + "</strong>" + elem.substr(

                  foundPos + entry.length) + "</li>");

                break;

              }

            }

            foundPos = instance.options.ignoreCase ?

              elem.toLowerCase().indexOf(entry.toLowerCase(), foundPos + 1) :

              elem.indexOf(entry, foundPos + 1);

          }

        }

        if (partial.length)

          ret = ret.concat(partial.slice(0, instance.options.choices - ret.length))

        return "<ul>" + ret.join('') + "</ul>";

      }

    }, options || {});

  }

});

// AJAX in-place editor

//

// see documentation on http://wiki.script.aculo.us/scriptaculous/show/Ajax.InPlaceEditor

// Use this if you notice weird scrolling problems on some browsers,

// the DOM might be a bit confused when this gets called so do this

// waits 1 ms (with setTimeout) until it does the activation

Field.scrollFreeActivate = function(field) {

  setTimeout(function() {

    Field.activate(field);

  }, 1);

}

Ajax.InPlaceEditor = Class.create();

Ajax.InPlaceEditor.defaultHighlightColor = "#FFFF99";

Ajax.InPlaceEditor.prototype = {

  initialize: function(element, url, options) {

    this.url = url;

    this.element = $(element);

    this.options = Object.extend({

      okButton: true,

      okText: "ok",

      cancelLink: true,

      cancelText: "cancel",

      savingText: "Saving...",

      clickToEditText: "Click to edit",

      okText: "ok",

      rows: 1,

      onComplete: function(transport, element) {

        new Effect.Highlight(element, {startcolor: this.options.highlightcolor});

      },

      onFailure: function(transport) {

        alert("Error communicating with the server: " + transport.responseText.stripTags());

      },

      callback: function(form) {

        return Form.serialize(form);

      },

      handleLineBreaks: true,

      loadingText: 'Loading...',

      savingClassName: 'inplaceeditor-saving',

      loadingClassName: 'inplaceeditor-loading',

      formClassName: 'inplaceeditor-form',

      highlightcolor: Ajax.InPlaceEditor.defaultHighlightColor,

      highlightendcolor: "#FFFFFF",

      externalControl: null,

      submitOnBlur: false,

      ajaxOptions: {},

      evalScripts: false

    }, options || {});

    if(!this.options.formId && this.element.id) {

      this.options.formId = this.element.id + "-inplaceeditor";

      if ($(this.options.formId)) {

        // there's already a form with that name, don't specify an id

        this.options.formId = null;

      }

    }

    if (this.options.externalControl) {

      this.options.externalControl = $(this.options.externalControl);

    }

    this.originalBackground = Element.getStyle(this.element, 'background-color');

    if (!this.originalBackground) {

      this.originalBackground = "transparent";

    }

    this.element.title = this.options.clickToEditText;

    this.onclickListener = this.enterEditMode.bindAsEventListener(this);

    this.mouseoverListener = this.enterHover.bindAsEventListener(this);

    this.mouseoutListener = this.leaveHover.bindAsEventListener(this);

    Event.observe(this.element, 'click', this.onclickListener);

    Event.observe(this.element, 'mouseover', this.mouseoverListener);

    Event.observe(this.element, 'mouseout', this.mouseoutListener);

    if (this.options.externalControl) {

      Event.observe(this.options.externalControl, 'click', this.onclickListener);

      Event.observe(this.options.externalControl, 'mouseover', this.mouseoverListener);

      Event.observe(this.options.externalControl, 'mouseout', this.mouseoutListener);

    }

  },

  enterEditMode: function(evt) {

    if (this.saving) return;

    if (this.editing) return;

    this.editing = true;

    this.onEnterEditMode();

    if (this.options.externalControl) {

      Element.hide(this.options.externalControl);

    }

    Element.hide(this.element);

    this.createForm();

    this.element.parentNode.insertBefore(this.form, this.element);

    Field.scrollFreeActivate(this.editField);

    // stop the event to avoid a page refresh in Safari

    if (evt) {

      Event.stop(evt);

    }

    return false;

  },

  createForm: function() {

    this.form = document.createElement("form");

    this.form.id = this.options.formId;

    Element.addClassName(this.form, this.options.formClassName)

    this.form.onsubmit = this.onSubmit.bind(this);

    this.createEditField();

    if (this.options.textarea) {

      var br = document.createElement("br");

      this.form.appendChild(br);

    }

    if (this.options.okButton) {

      okButton = document.createElement("input");

      okButton.type = "submit";

      okButton.value = this.options.okText;

      okButton.className = 'editor_ok_button';

      this.form.appendChild(okButton);

    }

    if (this.options.cancelLink) {

      cancelLink = document.createElement("a");

      cancelLink.href = "#";

      cancelLink.appendChild(document.createTextNode(this.options.cancelText));

      cancelLink.onclick = this.onclickCancel.bind(this);

      cancelLink.className = 'editor_cancel';

      this.form.appendChild(cancelLink);

    }

  },

  hasHTMLLineBreaks: function(string) {

    if (!this.options.handleLineBreaks) return false;

    return string.match(/<br/i) || string.match(/<p>/i);

  },

  convertHTMLLineBreaks: function(string) {

    return string.replace(/<br>/gi, "\n").replace(/<br\/>/gi, "\n").replace(/<\/p>/gi, "\n").replace(/<p>/gi, "");

  },

  createEditField: function() {

    var text;

    if(this.options.loadTextURL) {

      text = this.options.loadingText;

    } else {

      text = this.getText();

    }

    var obj = this;

    if (this.options.rows == 1 && !this.hasHTMLLineBreaks(text)) {

      this.options.textarea = false;

      var textField = document.createElement("input");

      textField.obj = this;

      textField.type = "text";

      textField.name = "value";

      textField.value = text;

      textField.style.backgroundColor = this.options.highlightcolor;

      textField.className = 'editor_field';

      var size = this.options.size || this.options.cols || 0;

      if (size != 0) textField.size = size;

      if (this.options.submitOnBlur)

        textField.onblur = this.onSubmit.bind(this);

      this.editField = textField;

    } else {

      this.options.textarea = true;

      var textArea = document.createElement("textarea");

      textArea.obj = this;

      textArea.name = "value";

      textArea.value = this.convertHTMLLineBreaks(text);

      textArea.rows = this.options.rows;

      textArea.cols = this.options.cols || 40;

      textArea.className = 'editor_field';

      if (this.options.submitOnBlur)

        textArea.onblur = this.onSubmit.bind(this);

      this.editField = textArea;

    }

    if(this.options.loadTextURL) {

      this.loadExternalText();

    }

    this.form.appendChild(this.editField);

  },

  getText: function() {

    return this.element.innerHTML;

  },

  loadExternalText: function() {

    Element.addClassName(this.form, this.options.loadingClassName);

    this.editField.disabled = true;

    new Ajax.Request(

      this.options.loadTextURL,

      Object.extend({

        asynchronous: true,

        onComplete: this.onLoadedExternalText.bind(this)

      }, this.options.ajaxOptions)

    );

  },

  onLoadedExternalText: function(transport) {

    Element.removeClassName(this.form, this.options.loadingClassName);

    this.editField.disabled = false;

    this.editField.value = transport.responseText.stripTags();

  },

  onclickCancel: function() {

    this.onComplete();

    this.leaveEditMode();

    return false;

  },

  onFailure: function(transport) {

    this.options.onFailure(transport);

    if (this.oldInnerHTML) {

      this.element.innerHTML = this.oldInnerHTML;

      this.oldInnerHTML = null;

    }

    return false;

  },

  onSubmit: function() {

    // onLoading resets these so we need to save them away for the Ajax call

    var form = this.form;

    var value = this.editField.value;

    // do this first, sometimes the ajax call returns before we get a chance to switch on Saving...

    // which means this will actually switch on Saving... *after* we've left edit mode causing Saving...

    // to be displayed indefinitely

    this.onLoading();

    if (this.options.evalScripts) {

      new Ajax.Request(

        this.url, Object.extend({

          parameters: this.options.callback(form, value),

          onComplete: this.onComplete.bind(this),

          onFailure: this.onFailure.bind(this),

          asynchronous:true,

          evalScripts:true

        }, this.options.ajaxOptions));

    } else  {

      new Ajax.Updater(

        { success: this.element,

          // don't update on failure (this could be an option)

          failure: null },

        this.url, Object.extend({

          parameters: this.options.callback(form, value),

          onComplete: this.onComplete.bind(this),

          onFailure: this.onFailure.bind(this)

        }, this.options.ajaxOptions));

    }

    // stop the event to avoid a page refresh in Safari

    if (arguments.length > 1) {

      Event.stop(arguments[0]);

    }

    return false;

  },

  onLoading: function() {

    this.saving = true;

    this.removeForm();

    this.leaveHover();

    this.showSaving();

  },

  showSaving: function() {

    this.oldInnerHTML = this.element.innerHTML;

    this.element.innerHTML = this.options.savingText;

    Element.addClassName(this.element, this.options.savingClassName);

    this.element.style.backgroundColor = this.originalBackground;

    Element.show(this.element);

  },

  removeForm: function() {

    if(this.form) {

      if (this.form.parentNode) Element.remove(this.form);

      this.form = null;

    }

  },

  enterHover: function() {

    if (this.saving) return;

    this.element.style.backgroundColor = this.options.highlightcolor;

    if (this.effect) {

      this.effect.cancel();

    }

    Element.addClassName(this.element, this.options.hoverClassName)

  },

  leaveHover: function() {

    if (this.options.backgroundColor) {

      this.element.style.backgroundColor = this.oldBackground;

    }

    Element.removeClassName(this.element, this.options.hoverClassName)

    if (this.saving) return;

    this.effect = new Effect.Highlight(this.element, {

      startcolor: this.options.highlightcolor,

      endcolor: this.options.highlightendcolor,

      restorecolor: this.originalBackground

    });

  },

  leaveEditMode: function() {

    Element.removeClassName(this.element, this.options.savingClassName);

    this.removeForm();

    this.leaveHover();

    this.element.style.backgroundColor = this.originalBackground;

    Element.show(this.element);

    if (this.options.externalControl) {

      Element.show(this.options.externalControl);

    }

    this.editing = false;

    this.saving = false;

    this.oldInnerHTML = null;

    this.onLeaveEditMode();

  },

  onComplete: function(transport) {

    this.leaveEditMode();

    this.options.onComplete.bind(this)(transport, this.element);

  },

  onEnterEditMode: function() {},

  onLeaveEditMode: function() {},

  dispose: function() {

    if (this.oldInnerHTML) {

      this.element.innerHTML = this.oldInnerHTML;

    }

    this.leaveEditMode();

    Event.stopObserving(this.element, 'click', this.onclickListener);

    Event.stopObserving(this.element, 'mouseover', this.mouseoverListener);

    Event.stopObserving(this.element, 'mouseout', this.mouseoutListener);

    if (this.options.externalControl) {

      Event.stopObserving(this.options.externalControl, 'click', this.onclickListener);

      Event.stopObserving(this.options.externalControl, 'mouseover', this.mouseoverListener);

      Event.stopObserving(this.options.externalControl, 'mouseout', this.mouseoutListener);

    }

  }

};

Ajax.InPlaceCollectionEditor = Class.create();

Object.extend(Ajax.InPlaceCollectionEditor.prototype, Ajax.InPlaceEditor.prototype);

Object.extend(Ajax.InPlaceCollectionEditor.prototype, {

  createEditField: function() {

    if (!this.cached_selectTag) {

      var selectTag = document.createElement("select");

      var collection = this.options.collection || [];

      var optionTag;

      collection.each(function(e,i) {

        optionTag = document.createElement("option");

        optionTag.value = (e instanceof Array) ? e[0] : e;

        if(this.options.value==optionTag.value) optionTag.selected = true;

        optionTag.appendChild(document.createTextNode((e instanceof Array) ? e[1] : e));

        selectTag.appendChild(optionTag);

      }.bind(this));

      this.cached_selectTag = selectTag;

    }

    this.editField = this.cached_selectTag;

    if(this.options.loadTextURL) this.loadExternalText();

    this.form.appendChild(this.editField);

    this.options.callback = function(form, value) {

      return "value=" + encodeURIComponent(value);

    }

  }

});

// Delayed observer, like Form.Element.Observer,

// but waits for delay after last key input

// Ideal for live-search fields

Form.Element.DelayedObserver = Class.create();

Form.Element.DelayedObserver.prototype = {

  initialize: function(element, delay, callback) {

    this.delay     = delay || 0.5;

    this.element   = $(element);

    this.callback  = callback;

    this.timer     = null;

    this.lastValue = $F(this.element);

    Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));

  },

  delayedListener: function(event) {

    if(this.lastValue == $F(this.element)) return;

    if(this.timer) clearTimeout(this.timer);

    this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);

    this.lastValue = $F(this.element);

  },

  onTimerEvent: function() {

    this.timer = null;

    this.callback(this.element, $F(this.element));

  }

};