+++ /dev/null
-/*\r
- * Ext JS Library 2.2.1\r
- * Copyright(c) 2006-2009, Ext JS, LLC.\r
- * licensing@extjs.com\r
- * \r
- * http://extjs.com/license\r
- */\r
-\r
-/**\r
- * @class Ext.data.ScriptTagProxy\r
- * @extends Ext.data.DataProxy\r
- * An implementation of Ext.data.DataProxy that reads a data object from a URL which may be in a domain\r
- * other than the originating domain of the running page.<br>\r
- * <p>\r
- * <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\r
- * of the running page, you must use this class, rather than HttpProxy.</b><br>\r
- * <p>\r
- * The content passed back from a server resource requested by a ScriptTagProxy <b>must</b> be executable JavaScript\r
- * source code because it is used as the source inside a <script> tag.<br>\r
- * <p>\r
- * In order for the browser to process the returned data, the server must wrap the data object\r
- * with a call to a callback function, the name of which is passed as a parameter by the ScriptTagProxy.\r
- * Below is a Java example for a servlet which returns data for either a ScriptTagProxy, or an HttpProxy\r
- * depending on whether the callback name was passed:\r
- * <p>\r
- * <pre><code>\r
-boolean scriptTag = false;\r
-String cb = request.getParameter("callback");\r
-if (cb != null) {\r
- scriptTag = true;\r
- response.setContentType("text/javascript");\r
-} else {\r
- response.setContentType("application/x-json");\r
-}\r
-Writer out = response.getWriter();\r
-if (scriptTag) {\r
- out.write(cb + "(");\r
-}\r
-out.print(dataBlock.toJsonString());\r
-if (scriptTag) {\r
- out.write(");");\r
-}\r
-</code></pre>\r
- *\r
- * @constructor\r
- * @param {Object} config A configuration object.\r
- */\r
-Ext.data.ScriptTagProxy = function(config){\r
- Ext.data.ScriptTagProxy.superclass.constructor.call(this);\r
- Ext.apply(this, config);\r
- this.head = document.getElementsByTagName("head")[0];\r
- \r
- /**\r
- * @event loadexception\r
- * Fires if an exception occurs in the Proxy during data loading. This event can be fired for one of two reasons:\r
- * <ul><li><b>The load call timed out.</b> This means the load callback did not execute within the time limit\r
- * specified by {@link #timeout}. In this case, this event will be raised and the\r
- * fourth parameter (read error) will be null.</li>\r
- * <li><b>The load succeeded but the reader could not read the response.</b> This means the server returned\r
- * data, but the configured Reader threw an error while reading the data. In this case, this event will be \r
- * raised and the caught error will be passed along as the fourth parameter of this event.</li></ul>\r
- * Note that this event is also relayed through {@link Ext.data.Store}, so you can listen for it directly\r
- * on any Store instance.\r
- * @param {Object} this\r
- * @param {Object} options The loading options that were specified (see {@link #load} for details). If the load\r
- * call timed out, this parameter will be null.\r
- * @param {Object} arg The callback's arg object passed to the {@link #load} function\r
- * @param {Error} e The JavaScript Error object caught if the configured Reader could not read the data.\r
- * If the load call returned success: false, this parameter will be null.\r
- */\r
-};\r
-\r
-Ext.data.ScriptTagProxy.TRANS_ID = 1000;\r
-\r
-Ext.extend(Ext.data.ScriptTagProxy, Ext.data.DataProxy, {\r
- /**\r
- * @cfg {String} url The URL from which to request the data object.\r
- */\r
- /**\r
- * @cfg {Number} timeout (optional) The number of milliseconds to wait for a response. Defaults to 30 seconds.\r
- */\r
- timeout : 30000,\r
- /**\r
- * @cfg {String} callbackParam (Optional) The name of the parameter to pass to the server which tells\r
- * the server the name of the callback function set up by the load call to process the returned data object.\r
- * Defaults to "callback".<p>The server-side processing must read this parameter value, and generate\r
- * javascript output which calls this named function passing the data object as its only parameter.\r
- */\r
- callbackParam : "callback",\r
- /**\r
- * @cfg {Boolean} nocache (optional) Defaults to true. Disable caching by adding a unique parameter\r
- * name to the request.\r
- */\r
- nocache : true,\r
-\r
- /**\r
- * Load data from the configured URL, read the data object into\r
- * a block of Ext.data.Records using the passed Ext.data.DataReader implementation, and\r
- * process that block using the passed callback.\r
- * @param {Object} params An object containing properties which are to be used as HTTP parameters\r
- * for the request to the remote server.\r
- * @param {Ext.data.DataReader} reader The Reader object which converts the data\r
- * object into a block of Ext.data.Records.\r
- * @param {Function} callback The function into which to pass the block of Ext.data.Records.\r
- * The function must be passed <ul>\r
- * <li>The Record block object</li>\r
- * <li>The "arg" argument from the load function</li>\r
- * <li>A boolean success indicator</li>\r
- * </ul>\r
- * @param {Object} scope The scope in which to call the callback\r
- * @param {Object} arg An optional argument which is passed to the callback as its second parameter.\r
- */\r
- load : function(params, reader, callback, scope, arg){\r
- if(this.fireEvent("beforeload", this, params) !== false){\r
-\r
- var p = Ext.urlEncode(Ext.apply(params, this.extraParams));\r
-\r
- var url = this.url;\r
- url += (url.indexOf("?") != -1 ? "&" : "?") + p;\r
- if(this.nocache){\r
- url += "&_dc=" + (new Date().getTime());\r
- }\r
- var transId = ++Ext.data.ScriptTagProxy.TRANS_ID;\r
- var trans = {\r
- id : transId,\r
- cb : "stcCallback"+transId,\r
- scriptId : "stcScript"+transId,\r
- params : params,\r
- arg : arg,\r
- url : url,\r
- callback : callback,\r
- scope : scope,\r
- reader : reader\r
- };\r
- var conn = this;\r
-\r
- window[trans.cb] = function(o){\r
- conn.handleResponse(o, trans);\r
- };\r
-\r
- url += String.format("&{0}={1}", this.callbackParam, trans.cb);\r
-\r
- if(this.autoAbort !== false){\r
- this.abort();\r
- }\r
-\r
- trans.timeoutId = this.handleFailure.defer(this.timeout, this, [trans]);\r
-\r
- var script = document.createElement("script");\r
- script.setAttribute("src", url);\r
- script.setAttribute("type", "text/javascript");\r
- script.setAttribute("id", trans.scriptId);\r
- this.head.appendChild(script);\r
-\r
- this.trans = trans;\r
- }else{\r
- callback.call(scope||this, null, arg, false);\r
- }\r
- },\r
-\r
- // private\r
- isLoading : function(){\r
- return this.trans ? true : false;\r
- },\r
-\r
- /**\r
- * Abort the current server request.\r
- */\r
- abort : function(){\r
- if(this.isLoading()){\r
- this.destroyTrans(this.trans);\r
- }\r
- },\r
-\r
- // private\r
- destroyTrans : function(trans, isLoaded){\r
- this.head.removeChild(document.getElementById(trans.scriptId));\r
- clearTimeout(trans.timeoutId);\r
- if(isLoaded){\r
- window[trans.cb] = undefined;\r
- try{\r
- delete window[trans.cb];\r
- }catch(e){}\r
- }else{\r
- // if hasn't been loaded, wait for load to remove it to prevent script error\r
- window[trans.cb] = function(){\r
- window[trans.cb] = undefined;\r
- try{\r
- delete window[trans.cb];\r
- }catch(e){}\r
- };\r
- }\r
- },\r
-\r
- // private\r
- handleResponse : function(o, trans){\r
- this.trans = false;\r
- this.destroyTrans(trans, true);\r
- var result;\r
- try {\r
- result = trans.reader.readRecords(o);\r
- }catch(e){\r
- this.fireEvent("loadexception", this, o, trans.arg, e);\r
- trans.callback.call(trans.scope||window, null, trans.arg, false);\r
- return;\r
- }\r
- this.fireEvent("load", this, o, trans.arg);\r
- trans.callback.call(trans.scope||window, result, trans.arg, true);\r
- },\r
-\r
- // private\r
- handleFailure : function(trans){\r
- this.trans = false;\r
- this.destroyTrans(trans, false);\r
- this.fireEvent("loadexception", this, null, trans.arg);\r
- trans.callback.call(trans.scope||window, null, trans.arg, false);\r
- }\r
-});
\ No newline at end of file
git.ithinksw.org / extjs.git / blobdiff