updatemanager.js

ajax框架extjs是一套完整的富客户端解决方案

            }, cfg);

            this.transaction = Ext.Ajax.request(o);
        }
    },

    /**
     * Performs an async form post, updating this element with the response. If the form has the attribute
     * enctype="multipart/form-data", it assumes it's a file upload.
     * Uses this.sslBlankUrl for SSL file uploads to prevent IE security warning.
     * @param {String/HTMLElement} form The form Id or form element
     * @param {String} url (optional) The url to pass the form to. If omitted the action attribute on the form will be used.
     * @param {Boolean} reset (optional) Whether to try to reset the form after the update
     * @param {Function} callback (optional) Callback when transaction is complete. The following
     * parameters are passed:<ul>
     * <li><b>el</b> : Ext.Element<p class="sub-desc">The Element being updated.</p></li>
     * <li><b>success</b> : Boolean<p class="sub-desc">True for success, false for failure.</p></li>
     * <li><b>response</b> : XMLHttpRequest<p class="sub-desc">The XMLHttpRequest which processed the update.</p></li></ul>
     */
    formUpdate : function(form, url, reset, callback){
        if(this.fireEvent("beforeupdate", this.el, form, url) !== false){
            if(typeof url == "function"){
                url = url.call(this);
            }
            form = Ext.getDom(form)
            this.transaction = Ext.Ajax.request({
                form: form,
                url:url,
                success: this.processSuccess,
                failure: this.processFailure,
                scope: this,
                timeout: (this.timeout*1000),
                argument: {
                    "url": url,
                    "form": form,
                    "callback": callback,
                    "reset": reset
                }
            });
            this.showLoading.defer(1, this);
        }
    },

    /**
     * Refresh the element with the last used url or defaultUrl. If there is no url, it returns immediately
     * @param {Function} callback (optional) Callback when transaction is complete - called with signature (oElement, bSuccess)
     */
    refresh : function(callback){
        if(this.defaultUrl == null){
            return;
        }
        this.update(this.defaultUrl, null, callback, true);
    },

    /**
     * Set this element to auto refresh.  Can be canceled by calling {@link #stopAutoRefresh}.
     * @param {Number} interval How often to update (in seconds).
     * @param {String/Object/Function} url (optional) The url for this request, a config object in the same format
     * supported by {@link #load}, or a function to call to get the url (defaults to the last used url).  Note that while
     * the url used in a load call can be reused by this method, other load config options will not be reused and must be
     * sepcified as part of a config object passed as this paramter if needed.
     * @param {String/Object} params (optional) The parameters to pass as either a url encoded string
     * "&param1=1&param2=2" or as an object {param1: 1, param2: 2}
     * @param {Function} callback (optional) Callback when transaction is complete - called with signature (oElement, bSuccess)
     * @param {Boolean} refreshNow (optional) Whether to execute the refresh now, or wait the interval
     */
    startAutoRefresh : function(interval, url, params, callback, refreshNow){
        if(refreshNow){
            this.update(url || this.defaultUrl, params, callback, true);
        }
        if(this.autoRefreshProcId){
            clearInterval(this.autoRefreshProcId);
        }
        this.autoRefreshProcId = setInterval(this.update.createDelegate(this, [url || this.defaultUrl, params, callback, true]), interval*1000);
    },

    /**
     * Stop auto refresh on this element.
     */
     stopAutoRefresh : function(){
        if(this.autoRefreshProcId){
            clearInterval(this.autoRefreshProcId);
            delete this.autoRefreshProcId;
        }
    },

    /**
     * Returns true if the Updater is currently set to auto refresh its content (see {@link #startAutoRefresh}), otherwise false.
     */
    isAutoRefreshing : function(){
       return this.autoRefreshProcId ? true : false;
    },

    /**
     * Display the element's "loading" state. By default, the element is updated with {@link #indicatorText}. This
     * method may be overridden to perform a custom action while this Updater is actively updating its contents.
     */
    showLoading : function(){
        if(this.showLoadIndicator){
            this.el.update(this.indicatorText);
        }
    },

    // private
    processSuccess : function(response){
        this.transaction = null;
        if(response.argument.form && response.argument.reset){
            try{ // put in try/catch since some older FF releases had problems with this
                response.argument.form.reset();
            }catch(e){}
        }
        if(this.loadScripts){
            this.renderer.render(this.el, response, this,
                this.updateComplete.createDelegate(this, [response]));
        }else{
            this.renderer.render(this.el, response, this);
            this.updateComplete(response);
        }
    },

    // private
    updateComplete : function(response){
        this.fireEvent("update", this.el, response);
        if(typeof response.argument.callback == "function"){
            response.argument.callback.call(response.argument.scope, this.el, true, response, response.argument.options);
        }
    },

    // private
    processFailure : function(response){
        this.transaction = null;
        this.fireEvent("failure", this.el, response);
        if(typeof response.argument.callback == "function"){
            response.argument.callback.call(response.argument.scope, this.el, false, response, response.argument.options);
        }
    },

    /**
     * Sets the content renderer for this Updater. See {@link Ext.Updater.BasicRenderer#render} for more details.
     * @param {Object} renderer The object implementing the render() method
     */
    setRenderer : function(renderer){
        this.renderer = renderer;
    },

    /**
     * Returns the content renderer for this Updater. See {@link Ext.Updater.BasicRenderer#render} for more details.
     * @return {Object}
     */
    getRenderer : function(){
       return this.renderer;
    },

    /**
     * Sets the default URL used for updates.
     * @param {String/Function} defaultUrl The url or a function to call to get the url
     */
    setDefaultUrl : function(defaultUrl){
        this.defaultUrl = defaultUrl;
    },

    /**
     * Aborts the currently executing transaction, if any.
     */
    abort : function(){
        if(this.transaction){
            Ext.Ajax.abort(this.transaction);
        }
    },

    /**
     * Returns true if an update is in progress, otherwise false.
     * @return {Boolean}
     */
    isUpdating : function(){
        if(this.transaction){
            return Ext.Ajax.isLoading(this.transaction);
        }
        return false;
    }
});

/**
 * @class Ext.Updater.defaults
 * The defaults collection enables customizing the default properties of Updater
 */
   Ext.Updater.defaults = {
       /**
         * Timeout for requests or form posts in seconds (defaults to 30 seconds).
         * @type Number
         */
         timeout : 30,
         /**
         * True to process scripts by default (defaults to false).
         * @type Boolean
         */
        loadScripts : false,
        /**
        * Blank page URL to use with SSL file uploads (defaults to {@link Ext#SSL_SECURE_URL} if set, or "javascript:false").
        * @type String
        */
        sslBlankUrl : (Ext.SSL_SECURE_URL || "javascript:false"),
        /**
         * True to append a unique parameter to GET requests to disable caching (defaults to false).
         * @type Boolean
         */
        disableCaching : false,
        /**
         * Whether or not to show {@link #indicatorText} during loading (defaults to true).
         * @type Boolean
         */
        showLoadIndicator : true,
        /**
         * Text for loading indicator (defaults to '&lt;div class="loading-indicator"&gt;Loading...&lt;/div&gt;').
         * @type String
         */
        indicatorText : '<div class="loading-indicator">Loading...</div>'
   };

/**
 * Static convenience method. <b>This method is deprecated in favor of el.load({url:'foo.php', ...})</b>.
 * Usage:
 * <pre><code>Ext.Updater.updateElement("my-div", "stuff.php");</code></pre>
 * @param {Mixed} el The element to update
 * @param {String} url The url
 * @param {String/Object} params (optional) Url encoded param string or an object of name/value pairs
 * @param {Object} options (optional) A config object with any of the Updater properties you want to set - for
 * example: {disableCaching:true, indicatorText: "Loading data..."}
 * @static
 * @deprecated
 * @member Ext.Updater
 */
Ext.Updater.updateElement = function(el, url, params, options){
    var um = Ext.get(el).getUpdater();
    Ext.apply(um, options);
    um.update(url, params, options ? options.callback : null);
};
/**
 * @class Ext.Updater.BasicRenderer
 * Default Content renderer. Updates the elements innerHTML with the responseText.
 */
Ext.Updater.BasicRenderer = function(){};

Ext.Updater.BasicRenderer.prototype = {
    /**
     * This is called when the transaction is completed and it's time to update the element - The BasicRenderer
     * updates the elements innerHTML with the responseText - To perform a custom render (i.e. XML or JSON processing),
     * create an object with a "render(el, response)" method and pass it to setRenderer on the Updater.
     * @param {Ext.Element} el The element being rendered
     * @param {Object} response The XMLHttpRequest object
     * @param {Updater} updateManager The calling update manager
     * @param {Function} callback A callback that will need to be called if loadScripts is true on the Updater
     */
     render : function(el, response, updateManager, callback){
        el.update(response.responseText, updateManager.loadScripts, callback);
    }
};

Ext.UpdateManager = Ext.Updater;