-/*!
- * Ext JS Library 3.3.0
- * Copyright(c) 2006-2010 Ext JS, Inc.
- * licensing@extjs.com
- * http://www.extjs.com/license
- */
-/**
- * @class Ext.data.ScriptTagProxy
- * @extends Ext.data.DataProxy
- * An implementation of Ext.data.DataProxy that reads a data object from a URL which may be in a domain
- * other than the originating domain of the running page.<br>
- * <p>
- * <b>Note that if you are retrieving data from a page that is in a domain that is NOT the same as the originating domain
- * of the running page, you must use this class, rather than HttpProxy.</b><br>
- * <p>
- * The content passed back from a server resource requested by a ScriptTagProxy <b>must</b> be executable JavaScript
- * source code because it is used as the source inside a <script> tag.<br>
- * <p>
- * In order for the browser to process the returned data, the server must wrap the data object
- * with a call to a callback function, the name of which is passed as a parameter by the ScriptTagProxy.
- * Below is a Java example for a servlet which returns data for either a ScriptTagProxy, or an HttpProxy
- * depending on whether the callback name was passed:
- * <p>
- * <pre><code>
-boolean scriptTag = false;
-String cb = request.getParameter("callback");
-if (cb != null) {
- scriptTag = true;
- response.setContentType("text/javascript");
-} else {
- response.setContentType("application/x-json");
-}
-Writer out = response.getWriter();
-if (scriptTag) {
- out.write(cb + "(");
-}
-out.print(dataBlock.toJsonString());
-if (scriptTag) {
- out.write(");");
-}
-</code></pre>
- * <p>Below is a PHP example to do the same thing:</p><pre><code>
-$callback = $_REQUEST['callback'];
-
-// Create the output object.
-$output = array('a' => 'Apple', 'b' => 'Banana');
-
-//start output
-if ($callback) {
- header('Content-Type: text/javascript');
- echo $callback . '(' . json_encode($output) . ');';
-} else {
- header('Content-Type: application/x-json');
- echo json_encode($output);
-}
-</code></pre>
- * <p>Below is the ASP.Net code to do the same thing:</p><pre><code>
-String jsonString = "{success: true}";
-String cb = Request.Params.Get("callback");
-String responseString = "";
-if (!String.IsNullOrEmpty(cb)) {
- responseString = cb + "(" + jsonString + ")";
-} else {
- responseString = jsonString;
-}
-Response.Write(responseString);
-</code></pre>
- *
- * @constructor
- * @param {Object} config A configuration object.
- */
-Ext.data.ScriptTagProxy = function(config){
- Ext.apply(this, config);
-
- Ext.data.ScriptTagProxy.superclass.constructor.call(this, config);
-
- this.head = document.getElementsByTagName("head")[0];
-
- /**
- * @event loadexception
- * <b>Deprecated</b> in favor of 'exception' event.
- * Fires if an exception occurs in the Proxy during data loading. This event can be fired for one of two reasons:
- * <ul><li><b>The load call timed out.</b> This means the load callback did not execute within the time limit
- * specified by {@link #timeout}. In this case, this event will be raised and the
- * fourth parameter (read error) will be null.</li>
- * <li><b>The load succeeded but the reader could not read the response.</b> This means the server returned
- * data, but the configured Reader threw an error while reading the data. In this case, this event will be
- * raised and the caught error will be passed along as the fourth parameter of this event.</li></ul>
- * Note that this event is also relayed through {@link Ext.data.Store}, so you can listen for it directly
- * on any Store instance.
- * @param {Object} this
- * @param {Object} options The loading options that were specified (see {@link #load} for details). If the load
- * call timed out, this parameter will be null.
- * @param {Object} arg The callback's arg object passed to the {@link #load} function
- * @param {Error} e The JavaScript Error object caught if the configured Reader could not read the data.
- * If the remote request returns success: false, this parameter will be null.
- */
-};
-
-Ext.data.ScriptTagProxy.TRANS_ID = 1000;
-
-Ext.extend(Ext.data.ScriptTagProxy, Ext.data.DataProxy, {
- /**
- * @cfg {String} url The URL from which to request the data object.
- */
- /**
- * @cfg {Number} timeout (optional) The number of milliseconds to wait for a response. Defaults to 30 seconds.
- */
- timeout : 30000,
- /**
- * @cfg {String} callbackParam (Optional) The name of the parameter to pass to the server which tells
- * the server the name of the callback function set up by the load call to process the returned data object.
- * Defaults to "callback".<p>The server-side processing must read this parameter value, and generate
- * javascript output which calls this named function passing the data object as its only parameter.
- */
- callbackParam : "callback",
- /**
- * @cfg {Boolean} nocache (optional) Defaults to true. Disable caching by adding a unique parameter
- * name to the request.
- */
- nocache : true,
-
- /**
- * HttpProxy implementation of DataProxy#doRequest
- * @param {String} action
- * @param {Ext.data.Record/Ext.data.Record[]} rs If action is <tt>read</tt>, rs will be null
- * @param {Object} params An object containing properties which are to be used as HTTP parameters
- * for the request to the remote server.
- * @param {Ext.data.DataReader} reader The Reader object which converts the data
- * object into a block of Ext.data.Records.
- * @param {Function} callback The function into which to pass the block of Ext.data.Records.
- * The function must be passed <ul>
- * <li>The Record block object</li>
- * <li>The "arg" argument from the load function</li>
- * <li>A boolean success indicator</li>
- * </ul>
- * @param {Object} scope The scope (<code>this</code> reference) in which the callback function is executed. Defaults to the browser window.
- * @param {Object} arg An optional argument which is passed to the callback as its second parameter.
- */
- doRequest : function(action, rs, params, reader, callback, scope, arg) {
- var p = Ext.urlEncode(Ext.apply(params, this.extraParams));
-
- var url = this.buildUrl(action, rs);
- if (!url) {
- throw new Ext.data.Api.Error('invalid-url', url);
- }
- url = Ext.urlAppend(url, p);
-
- if(this.nocache){
- url = Ext.urlAppend(url, '_dc=' + (new Date().getTime()));
- }
- var transId = ++Ext.data.ScriptTagProxy.TRANS_ID;
- var trans = {
- id : transId,
- action: action,
- cb : "stcCallback"+transId,
- scriptId : "stcScript"+transId,
- params : params,
- arg : arg,
- url : url,
- callback : callback,
- scope : scope,
- reader : reader
- };
- window[trans.cb] = this.createCallback(action, rs, trans);
- url += String.format("&{0}={1}", this.callbackParam, trans.cb);
- if(this.autoAbort !== false){
- this.abort();
- }
-
- trans.timeoutId = this.handleFailure.defer(this.timeout, this, [trans]);
-
- var script = document.createElement("script");
- script.setAttribute("src", url);
- script.setAttribute("type", "text/javascript");
- script.setAttribute("id", trans.scriptId);
- this.head.appendChild(script);
-
- this.trans = trans;
- },
-
- // @private createCallback
- createCallback : function(action, rs, trans) {
- var self = this;
- return function(res) {
- self.trans = false;
- self.destroyTrans(trans, true);
- if (action === Ext.data.Api.actions.read) {
- self.onRead.call(self, action, trans, res);
- } else {
- self.onWrite.call(self, action, trans, res, rs);
- }
- };
- },
- /**
- * Callback for read actions
- * @param {String} action [Ext.data.Api.actions.create|read|update|destroy]
- * @param {Object} trans The request transaction object
- * @param {Object} res The server response
- * @protected
- */
- onRead : function(action, trans, res) {
- var result;
- try {
- result = trans.reader.readRecords(res);
- }catch(e){
- // @deprecated: fire loadexception
- this.fireEvent("loadexception", this, trans, res, e);
-
- this.fireEvent('exception', this, 'response', action, trans, res, e);
- trans.callback.call(trans.scope||window, null, trans.arg, false);
- return;
- }
- if (result.success === false) {
- // @deprecated: fire old loadexception for backwards-compat.
- this.fireEvent('loadexception', this, trans, res);
-
- this.fireEvent('exception', this, 'remote', action, trans, res, null);
- } else {
- this.fireEvent("load", this, res, trans.arg);
- }
- trans.callback.call(trans.scope||window, result, trans.arg, result.success);
- },
- /**
- * Callback for write actions
- * @param {String} action [Ext.data.Api.actions.create|read|update|destroy]
- * @param {Object} trans The request transaction object
- * @param {Object} res The server response
- * @protected
- */
- onWrite : function(action, trans, response, rs) {
- var reader = trans.reader;
- try {
- // though we already have a response object here in STP, run through readResponse to catch any meta-data exceptions.
- var res = reader.readResponse(action, response);
- } catch (e) {
- this.fireEvent('exception', this, 'response', action, trans, res, e);
- trans.callback.call(trans.scope||window, null, res, false);
- return;
- }
- if(!res.success === true){
- this.fireEvent('exception', this, 'remote', action, trans, res, rs);
- trans.callback.call(trans.scope||window, null, res, false);
- return;
- }
- this.fireEvent("write", this, action, res.data, res, rs, trans.arg );
- trans.callback.call(trans.scope||window, res.data, res, true);
- },
-
- // private
- isLoading : function(){
- return this.trans ? true : false;
- },
-
- /**
- * Abort the current server request.
- */
- abort : function(){
- if(this.isLoading()){
- this.destroyTrans(this.trans);
- }
- },
-
- // private
- destroyTrans : function(trans, isLoaded){
- this.head.removeChild(document.getElementById(trans.scriptId));
- clearTimeout(trans.timeoutId);
- if(isLoaded){
- window[trans.cb] = undefined;
- try{
- delete window[trans.cb];
- }catch(e){}
- }else{
- // if hasn't been loaded, wait for load to remove it to prevent script error
- window[trans.cb] = function(){
- window[trans.cb] = undefined;
- try{
- delete window[trans.cb];
- }catch(e){}
- };
- }
- },
-
- // private
- handleFailure : function(trans){
- this.trans = false;
- this.destroyTrans(trans, false);
- if (trans.action === Ext.data.Api.actions.read) {
- // @deprecated firing loadexception
- this.fireEvent("loadexception", this, null, trans.arg);
- }
-
- this.fireEvent('exception', this, 'response', trans.action, {
- response: null,
- options: trans.arg
- });
- trans.callback.call(trans.scope||window, null, trans.arg, false);
- },
-
- // inherit docs
- destroy: function(){
- this.abort();
- Ext.data.ScriptTagProxy.superclass.destroy.call(this);
- }
-});
\ No newline at end of file
git.ithinksw.org / extjs.git / blobdiff