/** * This class manages a pending Ajax request. Instances of this type are created by the * `{@link Ext.data.Connection#request}` method. * @since 6.0.0 */Ext.define('Ext.data.request.Ajax', { extend: 'Ext.data.request.Base', alias: 'request.ajax', requires: [ 'Ext.data.flash.BinaryXhr' ], statics: { /** * Checks if the response status was successful * @param {Number} status The status code * @param {Object} response The Response object * @return {Object} An object containing success/status state * @private */ parseStatus: function(status, response) { var len; if (response) { //We have to account for binary response type if (response.responseType === 'arraybuffer') { len = response.byteLength; } else if (response.responseText) { len = response.responseText.length; } } // see: https://prototype.lighthouseapp.com/projects/8886/tickets/129-ie-mangles-http-response-status-code-204-to-1223 status = status == 1223 ? 204 : status; var success = (status >= 200 && status < 300) || status == 304 || (status == 0 && Ext.isNumber(len)), isException = false; if (!success) { switch (status) { case 12002: case 12029: case 12030: case 12031: case 12152: case 13030: isException = true; break; } } return { success: success, isException: isException }; } }, start: function(data) { var me = this, options = me.options, requestOptions = me.requestOptions, isXdr = me.isXdr, xhr, headers; xhr = me.xhr = me.openRequest(options, requestOptions, me.async, me.username, me.password); // XDR doesn't support setting any headers if (!isXdr) { headers = me.setupHeaders(xhr, options, requestOptions.data, requestOptions.params); } if (me.async) { if (!isXdr) { xhr.onreadystatechange = me.bindStateChange(); } } if (isXdr) { me.processXdrRequest(me, xhr); } // Parent will set the timeout if needed me.callParent([data]); // start the request! xhr.send(data); if (!me.async) { return me.onComplete(); } return me; }, /** * Aborts an active request. */ abort: function(force) { var me = this, xhr = me.xhr; if (force || me.isLoading()) { /* * Clear out the onreadystatechange here, this allows us * greater control, the browser may/may not fire the function * depending on a series of conditions. */ try { xhr.onreadystatechange = null; } catch (e) { // Setting onreadystatechange to null can cause problems in IE, see // http://www.quirksmode.org/blog/archives/2005/09/xmlhttp_notes_a_1.html xhr.onreadystatechange = Ext.emptyFn; } xhr.abort(); me.callParent([force]); me.onComplete(); me.cleanup(); } }, /** * Cleans up any left over information from the request */ cleanup: function() { this.xhr = null; delete this.xhr; }, isLoading: function() { var me = this, xhr = me.xhr, state = xhr && xhr.readyState, C = Ext.data.flash && Ext.data.flash.BinaryXhr; if (!xhr || me.aborted || me.timedout) { return false; } // if there is a connection and readyState is not 0 or 4, or in case of // BinaryXHR, not 4 if (C && xhr instanceof C) { return state !== 4; } return state !== 0 && state !== 4; }, /** * Creates and opens an appropriate XHR transport for a given request on this browser. * This logic is contained in an individual method to allow for overrides to process all * of the parameters and options and return a suitable, open connection. * @private */ openRequest: function(options, requestOptions, async, username, password) { var me = this, xhr = me.newRequest(options); if (username) { xhr.open(requestOptions.method, requestOptions.url, async, username, password); } else { if (me.isXdr) { xhr.open(requestOptions.method, requestOptions.url); } else { xhr.open(requestOptions.method, requestOptions.url, async); } } if (options.binary || me.binary) { if (window.Uint8Array) { xhr.responseType = 'arraybuffer'; } else if (xhr.overrideMimeType) { // In some older non-IE browsers, e.g. ff 3.6, that do not // support Uint8Array, a mime type override is required so that // the unprocessed binary data can be read from the responseText // (see createResponse()) xhr.overrideMimeType('text\/plain; charset=x-user-defined'); //<debug> } else if (!Ext.isIE) { Ext.log.warn("Your browser does not support loading binary data using Ajax."); //</debug> } } if (options.withCredentials || me.withCredentials) { xhr.withCredentials = true; } return xhr; }, /** * Creates the appropriate XHR transport for a given request on this browser. On IE * this may be an `XDomainRequest` rather than an `XMLHttpRequest`. * @private */ newRequest: function(options) { var me = this, xhr; if (options.binaryData) { // This is a binary data request. Handle submission differently for differnet browsers if (window.Uint8Array) { // On browsers that support this, use the native XHR object xhr = me.getXhrInstance(); } else { // catch all for all other browser types xhr = new Ext.data.flash.BinaryXhr(); } } else if (me.cors && Ext.isIE9m) { xhr = me.getXdrInstance(); me.isXdr = true; } else { xhr = me.getXhrInstance(); me.isXdr = false; } return xhr; }, /** * Setup all the headers for the request * @private * @param {Object} xhr The xhr object * @param {Object} options The options for the request * @param {Object} data The data for the request * @param {Object} params The params for the request */ setupHeaders: function(xhr, options, data, params) { var me = this, headers = Ext.apply({}, options.headers || {}, me.defaultHeaders), contentType = me.defaultPostHeader, jsonData = options.jsonData, xmlData = options.xmlData, type = 'Content-Type', useHeader = me.useDefaultXhrHeader, key, header; if (!headers.hasOwnProperty(type) && (data || params)) { if (data) { if (options.rawData) { contentType = 'text/plain'; } else { if (xmlData && Ext.isDefined(xmlData)) { contentType = 'text/xml'; } else if (jsonData && Ext.isDefined(jsonData)) { contentType = 'application/json'; } } } headers[type] = contentType; } if (useHeader && !headers['X-Requested-With']) { headers['X-Requested-With'] = me.defaultXhrHeader; } // If undefined/null, remove it and don't set the header. // Allow the browser to do so. if (headers[type] === undefined || headers[type] === null) { delete headers[type]; } // set up all the request headers on the xhr object try { for (key in headers) { if (headers.hasOwnProperty(key)) { header = headers[key]; xhr.setRequestHeader(key, header); } } } catch(e) { // TODO Request shouldn't fire events from its owner me.owner.fireEvent('exception', key, header); } return headers; }, /** * Creates the appropriate XDR transport for this browser. * - IE 7 and below don't support CORS * - IE 8 and 9 support CORS with native XDomainRequest object * - IE 10 (and above?) supports CORS with native XMLHttpRequest object * @private */ getXdrInstance: function() { var xdr; if (Ext.ieVersion >= 8) { xdr = new XDomainRequest(); } else { Ext.raise({ msg: 'Your browser does not support CORS' }); } return xdr; }, /** * Creates the appropriate XHR transport for this browser. * @private */ getXhrInstance: (function() { var options = [function() { return new XMLHttpRequest(); }, function() { return new ActiveXObject('MSXML2.XMLHTTP.3.0'); // jshint ignore:line }, function() { return new ActiveXObject('MSXML2.XMLHTTP'); // jshint ignore:line }, function() { return new ActiveXObject('Microsoft.XMLHTTP'); // jshint ignore:line }], i = 0, len = options.length, xhr; for (; i < len; ++i) { try { xhr = options[i]; xhr(); break; } catch(e) { } } return xhr; }()), processXdrRequest: function(request, xhr) { var me = this; // Mutate the request object as per XDR spec. delete request.headers; request.contentType = request.options.contentType || me.defaultXdrContentType; xhr.onload = me.bindStateChange(true); xhr.onerror = xhr.ontimeout = me.bindStateChange(false); }, processXdrResponse: function(response, xhr) { // Mutate the response object as per XDR spec. response.getAllResponseHeaders = function() { return []; }; response.getResponseHeader = function() { return ''; }; response.contentType = xhr.contentType || this.defaultXdrContentType; }, bindStateChange: function (xdrResult) { var me = this; return function () { Ext.elevate(function () { me.onStateChange(xdrResult); }); }; }, onStateChange: function(xdrResult) { var me = this, xhr = me.xhr; // Using CORS with IE doesn't support readyState so we fake it. if ((xhr && xhr.readyState == 4) || me.isXdr) { me.clearTimer(); me.onComplete(xdrResult); me.cleanup(); } }, /** * To be called when the request has come back from the server * @param {Object} xdrResult * @return {Object} The response * @private */ onComplete: function(xdrResult) { var me = this, owner = me.owner, options = me.options, xhr = me.xhr, failure = { success: false, isException: false }, result, success, response; if (!xhr || me.destroyed) { return me.result = failure; } try { result = Ext.data.request.Ajax.parseStatus(xhr.status, xhr); if (result.success) { // This is quite difficult to reproduce, however if we abort a request // just before it returns from the server, occasionally the status will be // returned correctly but the request is still yet to be complete. result.success = xhr.readyState === 4; } } catch (e) { // In some browsers we can't access the status if the readyState is not 4, // so the request has failed result = failure; } success = me.success = me.isXdr ? xdrResult : result.success; if (success) { response = me.createResponse(xhr); if (owner.hasListeners.requestcomplete) { owner.fireEvent('requestcomplete', owner, response, options); } if (options.success) { Ext.callback(options.success, options.scope, [response, options]); } } else { if (result.isException || me.aborted || me.timedout) { response = me.createException(xhr); } else { response = me.createResponse(xhr); } if (owner.hasListeners.requestexception) { owner.fireEvent('requestexception', owner, response, options); } if (options.failure) { Ext.callback(options.failure, options.scope, [response, options]); } } me.result = response; if (options.callback) { Ext.callback(options.callback, options.scope, [options, success, response]); } owner.onRequestComplete(me); me.callParent([xdrResult]); return response; }, /** * Creates the response object * @param {Object} xhr * @private */ createResponse: function(xhr) { var me = this, isXdr = me.isXdr, headers = {}, lines = isXdr ? [] : xhr.getAllResponseHeaders().replace(/\r\n/g, '\n').split('\n'), count = lines.length, line, index, key, response, byteArray; while (count--) { line = lines[count]; index = line.indexOf(':'); if (index >= 0) { key = line.substr(0, index).toLowerCase(); if (line.charAt(index + 1) == ' ') { ++index; } headers[key] = line.substr(index + 1); } } response = { request: me, requestId: me.id, status: xhr.status, statusText: xhr.statusText, getResponseHeader: function(header) { return headers[header.toLowerCase()]; }, getAllResponseHeaders: function() { return headers; } }; if (isXdr) { me.processXdrResponse(response, xhr); } if (me.binary) { response.responseBytes = me.getByteArray(xhr); } else { // an error is thrown when trying to access responseText or responseXML // on an xhr object with responseType of 'arraybuffer', so only attempt // to set these properties in the response if we're not dealing with // binary data response.responseText = xhr.responseText; response.responseXML = xhr.responseXML; } return response; }, destroy: function() { this.xhr = null; this.callParent(); }, privates: { /** * Gets binary data from the xhr response object and returns it as a byte array * @param {Object} xhr the xhr response object * @return {Uint8Array/Array} * @private */ getByteArray: function(xhr) { var response = xhr.response, responseBody = xhr.responseBody, Cls = Ext.data.flash && Ext.data.flash.BinaryXhr, byteArray, responseText, len, i; if (xhr instanceof Cls) { // If this was a BinaryXHR request via flash, we already have the bytes ready byteArray = xhr.responseBytes; } else if (window.Uint8Array) { // Modern browsers (including IE10) have a native byte array // which can be created by passing the ArrayBuffer (returned as // the xhr.response property) to the Uint8Array constructor. byteArray = response ? new Uint8Array(response) : []; } else if (Ext.isIE9p) { // In IE9 and below the responseBody property contains a byte array // but it is not directly accessible using javascript. // In IE9p we can get the bytes by constructing a VBArray // using the responseBody and then converting it to an Array. try { byteArray = new VBArray(responseBody).toArray(); // jshint ignore:line } catch(e) { // If the binary response is empty, the VBArray constructor will // choke on the responseBody. We can't simply do a null check // on responseBody because responseBody is always falsy when it // contains binary data. byteArray = []; } } else if (Ext.isIE) { // IE8 and below also have a VBArray constructor, but throw a // "VBArray Expected" error if you try to pass the responseBody to // the VBArray constructor. // http://msdn.microsoft.com/en-us/library/ye3x9by3%28v=vs.71%29.aspx // so we have to use vbscript injection to access the bytes if (!this.self.vbScriptInjected) { this.injectVBScript(); } getIEByteArray(xhr.responseBody, byteArray = []); // jshint ignore:line } else { // in other older browsers make a best-effort attempt to read the // bytes from responseText byteArray = []; responseText = xhr.responseText; len = responseText.length; for (i = 0; i < len; i++) { // Some characters have an extra byte 0xF7 in the high order // position. Throw away the high order byte and then push the // result onto the byteArray. byteArray.push(responseText.charCodeAt(i) & 0xFF); } } return byteArray; }, /** * Injects a vbscript tag containing a 'getIEByteArray' method for reading * binary data from an xhr response in IE8 and below. * @private */ injectVBScript: function() { var scriptTag = document.createElement('script'); scriptTag.type = 'text/vbscript'; scriptTag.text = [ 'Function getIEByteArray(byteArray, out)', 'Dim len, i', 'len = LenB(byteArray)', 'For i = 1 to len', 'out.push(AscB(MidB(byteArray, i, 1)))', 'Next', 'End Function' ].join('\n'); Ext.getHead().dom.appendChild(scriptTag); this.self.vbScriptInjected = true; } }});