// 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;
        this.getEntry(this.index).scrollIntoView(true);
    },

    markNext:function () {
        if (this.index < this.entryCount - 1) this.index++
        else this.index = 0;
        this.getEntry(this.index).scrollIntoView(false);
    },

    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));
    }
};