X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/ee06f37b0f6f6d94cd05a6ffae556660f7c4a2bc..c930e9176a5a85509c5b0230e2bff5c22a591432:/source/data/ScriptTagProxy.js diff --git a/source/data/ScriptTagProxy.js b/source/data/ScriptTagProxy.js deleted file mode 100644 index 6fe4c9ee..00000000 --- a/source/data/ScriptTagProxy.js +++ /dev/null @@ -1,218 +0,0 @@ -/* - * Ext JS Library 2.2.1 - * Copyright(c) 2006-2009, Ext JS, LLC. - * licensing@extjs.com - * - * http://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.
- *

- * 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.
- *

- * The content passed back from a server resource requested by a ScriptTagProxy must be executable JavaScript - * source code because it is used as the source inside a <script> tag.
- *

- * 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: - *

- * 


-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(");");
-}
-
- * - * @constructor - * @param {Object} config A configuration object. - */ -Ext.data.ScriptTagProxy = function(config){ - Ext.data.ScriptTagProxy.superclass.constructor.call(this); - Ext.apply(this, config); - this.head = document.getElementsByTagName("head")[0]; - - /** - * @event loadexception - * Fires if an exception occurs in the Proxy during data loading. This event can be fired for one of two reasons: - * - * 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 load call returned 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".

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, - - /** - * Load data from the configured URL, read the data object into - * a block of Ext.data.Records using the passed Ext.data.DataReader implementation, and - * process that block using the passed callback. - * @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

- * @param {Object} scope The scope in which to call the callback - * @param {Object} arg An optional argument which is passed to the callback as its second parameter. - */ - load : function(params, reader, callback, scope, arg){ - if(this.fireEvent("beforeload", this, params) !== false){ - - var p = Ext.urlEncode(Ext.apply(params, this.extraParams)); - - var url = this.url; - url += (url.indexOf("?") != -1 ? "&" : "?") + p; - if(this.nocache){ - url += "&_dc=" + (new Date().getTime()); - } - var transId = ++Ext.data.ScriptTagProxy.TRANS_ID; - var trans = { - id : transId, - cb : "stcCallback"+transId, - scriptId : "stcScript"+transId, - params : params, - arg : arg, - url : url, - callback : callback, - scope : scope, - reader : reader - }; - var conn = this; - - window[trans.cb] = function(o){ - conn.handleResponse(o, 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; - }else{ - callback.call(scope||this, null, arg, false); - } - }, - - // 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 - handleResponse : function(o, trans){ - this.trans = false; - this.destroyTrans(trans, true); - var result; - try { - result = trans.reader.readRecords(o); - }catch(e){ - this.fireEvent("loadexception", this, o, trans.arg, e); - trans.callback.call(trans.scope||window, null, trans.arg, false); - return; - } - this.fireEvent("load", this, o, trans.arg); - trans.callback.call(trans.scope||window, result, trans.arg, true); - }, - - // private - handleFailure : function(trans){ - this.trans = false; - this.destroyTrans(trans, false); - this.fireEvent("loadexception", this, null, trans.arg); - trans.callback.call(trans.scope||window, null, trans.arg, false); - } -}); \ No newline at end of file