Subversion Repositories eFlore/Applications.cel

/*

 * Ext JS Library 2.0.2

 * Copyright(c) 2006-2008, Ext JS, LLC.

 * licensing@extjs.com

 *

 * http://extjs.com/license

 */

/**

 * @class Ext.JsonView

 * @extends Ext.View

 * Shortcut class to create a JSON + {@link Ext.Updater} template view. Usage:

<pre><code>

var view = new Ext.JsonView("my-element",

    '<div id="{id}">{foo} - {bar}</div>', // auto create template

    { multiSelect: true, jsonRoot: "data" }

);

// listen for node click?

view.on("click", function(vw, index, node, e){

    alert('Node "' + node.id + '" at index: ' + index + " was clicked.");

});

// direct load of JSON data

view.load("foobar.php");

// Example from my blog list

var tpl = new Ext.Template(

    '<div class="entry">' +

    '<a class="entry-title" href="{link}">{title}</a>' +

    "<h4>{date} by {author} | {comments} Comments</h4>{description}" +

    "</div><hr />"

);

var moreView = new Ext.JsonView("entry-list", tpl, {

    jsonRoot: "posts"

});

moreView.on("beforerender", this.sortEntries, this);

moreView.load({

    url: "/blog/get-posts.php",

    params: "allposts=true",

    text: "Loading Blog Entries..."

});

</code></pre>

 * @constructor

 * Create a new JsonView

 * @param {Mixed} container The container element where the view is to be rendered.

 * @param {Template} tpl The rendering template

 * @param {Object} config The config object

 */

Ext.JsonView = function(container, tpl, config){

    Ext.JsonView.superclass.constructor.call(this, container, tpl, config);

    var um = this.el.getUpdater();

    um.setRenderer(this);

    um.on("update", this.onLoad, this);

    um.on("failure", this.onLoadException, this);

    /**

     * @event beforerender

     * Fires before rendering of the downloaded JSON data.

     * @param {Ext.JsonView} this

     * @param {Object} data The JSON data loaded

     */

    /**

     * @event load

     * Fires when data is loaded.

     * @param {Ext.JsonView} this

     * @param {Object} data The JSON data loaded

     * @param {Object} response The raw Connect response object

     */

    /**

     * @event loadexception

     * Fires when loading fails.

     * @param {Ext.JsonView} this

     * @param {Object} response The raw Connect response object

     */

    this.addEvents({

        'beforerender' : true,

        'load' : true,

        'loadexception' : true

    });

};

Ext.extend(Ext.JsonView, Ext.View, {

    /**

     * The root property in the loaded JSON object that contains the data

     * @type {String}

     */

    jsonRoot : "",

    /**

     * Refreshes the view.

     */

    refresh : function(){

        this.clearSelections();

        this.el.update("");

        var html = [];

        var o = this.jsonData;

        if(o && o.length > 0){

            for(var i = 0, len = o.length; i < len; i++){

                var data = this.prepareData(o[i], i, o);

                html[html.length] = this.tpl.apply(data);

            }

        }else{

            html.push(this.emptyText);

        }

        this.el.update(html.join(""));

        this.nodes = this.el.dom.childNodes;

        this.updateIndexes(0);

    },

    /**

     * Performs an async HTTP request, and loads the JSON from the response. If <i>params</i> are specified it uses POST, otherwise it uses GET.

     * @param {Object/String/Function} url The URL for this request, or a function to call to get the URL, or a config object containing any of the following options:

     <pre><code>

     view.load({

         url: "your-url.php",

         params: {param1: "foo", param2: "bar"}, // or a URL encoded string

         callback: yourFunction,

         scope: yourObject, //(optional scope)

         discardUrl: false,

         nocache: false,

         text: "Loading...",

         timeout: 30,

         scripts: false

     });

     </code></pre>

     * The only required property is <i>url</i>. The optional properties <i>nocache</i>, <i>text</i> and <i>scripts</i>

     * are shorthand for <i>disableCaching</i>, <i>indicatorText</i> and <i>loadScripts</i> and are used to set their associated property on this Updater instance.

     * @param {String/Object} params (optional) The parameters to pass, as either a URL encoded string "param1=1&param2=2" or an object {param1: 1, param2: 2}

     * @param {Function} callback (optional) Callback when transaction is complete - called with signature (oElement, bSuccess)

     * @param {Boolean} discardUrl (optional) By default when you execute an update the defaultUrl is changed to the last used URL. If true, it will not store the URL.

     */

    load : function(){

        var um = this.el.getUpdater();

        um.update.apply(um, arguments);

    },

    render : function(el, response){

        this.clearSelections();

        this.el.update("");

        var o;

        try{

            o = Ext.util.JSON.decode(response.responseText);

            if(this.jsonRoot){

                o = eval("o." + this.jsonRoot);

            }

        } catch(e){

        }

        /**

         * The current JSON data or null

         */

        this.jsonData = o;

        this.beforeRender();

        this.refresh();

    },

/**

 * Get the number of records in the current JSON dataset

 * @return {Number}

 */

    getCount : function(){

        return this.jsonData ? this.jsonData.length : 0;

    },

/**

 * Returns the JSON object for the specified node(s)

 * @param {HTMLElement/Array} node The node or an array of nodes

 * @return {Object/Array} If you pass in an array, you get an array back, otherwise

 * you get the JSON object for the node

 */

    getNodeData : function(node){

        if(Ext.isArray(node)){

            var data = [];

            for(var i = 0, len = node.length; i < len; i++){

                data.push(this.getNodeData(node[i]));

            }

            return data;

        }

        return this.jsonData[this.indexOf(node)] || null;

    },

    beforeRender : function(){

        this.snapshot = this.jsonData;

        if(this.sortInfo){

            this.sort.apply(this, this.sortInfo);

        }

        this.fireEvent("beforerender", this, this.jsonData);

    },

    onLoad : function(el, o){

        this.fireEvent("load", this, this.jsonData, o);

    },

    onLoadException : function(el, o){

        this.fireEvent("loadexception", this, o);

    },

/**

 * Filter the data by a specific property.

 * @param {String} property A property on your JSON objects

 * @param {String/RegExp} value Either string that the property values

 * should start with, or a RegExp to test against the property

 */

    filter : function(property, value){

        if(this.jsonData){

            var data = [];

            var ss = this.snapshot;

            if(typeof value == "string"){

                var vlen = value.length;

                if(vlen == 0){

                    this.clearFilter();

                    return;

                }

                value = value.toLowerCase();

                for(var i = 0, len = ss.length; i < len; i++){

                    var o = ss[i];

                    if(o[property].substr(0, vlen).toLowerCase() == value){

                        data.push(o);

                    }

                }

            } else if(value.exec){ // regex?

                for(var i = 0, len = ss.length; i < len; i++){

                    var o = ss[i];

                    if(value.test(o[property])){

                        data.push(o);

                    }

                }

            } else{

                return;

            }

            this.jsonData = data;

            this.refresh();

        }

    },

/**

 * Filter by a function. The passed function will be called with each

 * object in the current dataset. If the function returns true the value is kept,

 * otherwise it is filtered.

 * @param {Function} fn

 * @param {Object} scope (optional) The scope of the function (defaults to this JsonView)

 */

    filterBy : function(fn, scope){

        if(this.jsonData){

            var data = [];

            var ss = this.snapshot;

            for(var i = 0, len = ss.length; i < len; i++){

                var o = ss[i];

                if(fn.call(scope || this, o)){

                    data.push(o);

                }

            }

            this.jsonData = data;

            this.refresh();

        }

    },

/**

 * Clears the current filter.

 */

    clearFilter : function(){

        if(this.snapshot && this.jsonData != this.snapshot){

            this.jsonData = this.snapshot;

            this.refresh();

        }

    },

/**

 * Sorts the data for this view and refreshes it.

 * @param {String} property A property on your JSON objects to sort on

 * @param {String} direction (optional) "desc" or "asc" (defaults to "asc")

 * @param {Function} sortType (optional) A function to call to convert the data to a sortable value.

 */

    sort : function(property, dir, sortType){

        this.sortInfo = Array.prototype.slice.call(arguments, 0);

        if(this.jsonData){

            var p = property;

            var dsc = dir && dir.toLowerCase() == "desc";

            var f = function(o1, o2){

                var v1 = sortType ? sortType(o1[p]) : o1[p];

                var v2 = sortType ? sortType(o2[p]) : o2[p];

                ;

                if(v1 < v2){

                    return dsc ? +1 : -1;

                } else if(v1 > v2){

                    return dsc ? -1 : +1;

                } else{

                    return 0;

                }

            };

            this.jsonData.sort(f);

            this.refresh();

            if(this.jsonData != this.snapshot){

                this.snapshot.sort(f);

            }

        }

    }

});