X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/ee06f37b0f6f6d94cd05a6ffae556660f7c4a2bc..c930e9176a5a85509c5b0230e2bff5c22a591432:/docs/source/ext-base-ajax.html
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+
+
+ The source code
+
+
+
+
+ /*
+ * Portions of this file are based on pieces of Yahoo User Interface Library
+ * Copyright (c) 2007, Yahoo! Inc. All rights reserved.
+ * YUI licensed under the BSD License:
+ * http://developer.yahoo.net/yui/license.txt
+ */
+ Ext.lib.Ajax = function() {
+ var activeX = ['MSXML2.XMLHTTP.3.0',
+ 'MSXML2.XMLHTTP',
+ 'Microsoft.XMLHTTP'],
+ CONTENTTYPE = 'Content-Type';
+
+ // private
+ function setHeader(o) {
+ var conn = o.conn,
+ prop;
+
+ function setTheHeaders(conn, headers){
+ for (prop in headers) {
+ if (headers.hasOwnProperty(prop)) {
+ conn.setRequestHeader(prop, headers[prop]);
+ }
+ }
+ }
+
+ if (pub.defaultHeaders) {
+ setTheHeaders(conn, pub.defaultHeaders);
+ }
+
+ if (pub.headers) {
+ setTheHeaders(conn, pub.headers);
+ pub.headers = null;
+ }
+ }
+
+ // private
+ function createExceptionObject(tId, callbackArg, isAbort, isTimeout) {
+ return {
+ tId : tId,
+ status : isAbort ? -1 : 0,
+ statusText : isAbort ? 'transaction aborted' : 'communication failure',
+ isAbort: true,
+ isTimeout: true,
+ argument : callbackArg
+ };
+ }
+
+ // private
+ function initHeader(label, value) {
+ (pub.headers = pub.headers || {})[label] = value;
+ }
+
+ // private
+ function createResponseObject(o, callbackArg) {
+ var headerObj = {},
+ headerStr,
+ conn = o.conn,
+ t,
+ s;
+
+ try {
+ headerStr = o.conn.getAllResponseHeaders();
+ Ext.each(headerStr.replace(/\r\n/g, '\n').split('\n'), function(v){
+ t = v.indexOf(':');
+ if(t >= 0){
+ s = v.substr(0, t).toLowerCase();
+ if(v.charAt(t + 1) == ' '){
+ ++t;
+ }
+ headerObj[s] = v.substr(t + 1);
+ }
+ });
+ } catch(e) {}
+
+ return {
+ tId : o.tId,
+ status : conn.status,
+ statusText : conn.statusText,
+ getResponseHeader : function(header){return headerObj[header.toLowerCase()];},
+ getAllResponseHeaders : function(){return headerStr},
+ responseText : conn.responseText,
+ responseXML : conn.responseXML,
+ argument : callbackArg
+ };
+ }
+
+ // private
+ function releaseObject(o) {
+ o.conn = null;
+ o = null;
+ }
+
+ // private
+ function handleTransactionResponse(o, callback, isAbort, isTimeout) {
+ if (!callback) {
+ releaseObject(o);
+ return;
+ }
+
+ var httpStatus, responseObject;
+
+ try {
+ if (o.conn.status !== undefined && o.conn.status != 0) {
+ httpStatus = o.conn.status;
+ }
+ else {
+ httpStatus = 13030;
+ }
+ }
+ catch(e) {
+ httpStatus = 13030;
+ }
+
+ if ((httpStatus >= 200 && httpStatus < 300) || (Ext.isIE && httpStatus == 1223)) {
+ responseObject = createResponseObject(o, callback.argument);
+ if (callback.success) {
+ if (!callback.scope) {
+ callback.success(responseObject);
+ }
+ else {
+ callback.success.apply(callback.scope, [responseObject]);
+ }
+ }
+ }
+ else {
+ switch (httpStatus) {
+ case 12002:
+ case 12029:
+ case 12030:
+ case 12031:
+ case 12152:
+ case 13030:
+ responseObject = createExceptionObject(o.tId, callback.argument, (isAbort ? isAbort : false), isTimeout);
+ if (callback.failure) {
+ if (!callback.scope) {
+ callback.failure(responseObject);
+ }
+ else {
+ callback.failure.apply(callback.scope, [responseObject]);
+ }
+ }
+ break;
+ default:
+ responseObject = createResponseObject(o, callback.argument);
+ if (callback.failure) {
+ if (!callback.scope) {
+ callback.failure(responseObject);
+ }
+ else {
+ callback.failure.apply(callback.scope, [responseObject]);
+ }
+ }
+ }
+ }
+
+ releaseObject(o);
+ responseObject = null;
+ }
+
+ // private
+ function handleReadyState(o, callback){
+ callback = callback || {};
+ var conn = o.conn,
+ tId = o.tId,
+ poll = pub.poll,
+ cbTimeout = callback.timeout || null;
+
+ if (cbTimeout) {
+ pub.timeout[tId] = setTimeout(function() {
+ pub.abort(o, callback, true);
+ }, cbTimeout);
+ }
+
+ poll[tId] = setInterval(
+ function() {
+ if (conn && conn.readyState == 4) {
+ clearInterval(poll[tId]);
+ poll[tId] = null;
+
+ if (cbTimeout) {
+ clearTimeout(pub.timeout[tId]);
+ pub.timeout[tId] = null;
+ }
+
+ handleTransactionResponse(o, callback);
+ }
+ },
+ pub.pollInterval);
+ }
+
+ // private
+ function asyncRequest(method, uri, callback, postData) {
+ var o = getConnectionObject() || null;
+
+ if (o) {
+ o.conn.open(method, uri, true);
+
+ if (pub.useDefaultXhrHeader) {
+ initHeader('X-Requested-With', pub.defaultXhrHeader);
+ }
+
+ if(postData && pub.useDefaultHeader && (!pub.headers || !pub.headers[CONTENTTYPE])){
+ initHeader(CONTENTTYPE, pub.defaultPostHeader);
+ }
+
+ if (pub.defaultHeaders || pub.headers) {
+ setHeader(o);
+ }
+
+ handleReadyState(o, callback);
+ o.conn.send(postData || null);
+ }
+ return o;
+ }
+
+ // private
+ function getConnectionObject() {
+ var o;
+
+ try {
+ if (o = createXhrObject(pub.transactionId)) {
+ pub.transactionId++;
+ }
+ } catch(e) {
+ } finally {
+ return o;
+ }
+ }
+
+ // private
+ function createXhrObject(transactionId) {
+ var http;
+
+ try {
+ http = new XMLHttpRequest();
+ } catch(e) {
+ for (var i = 0; i < activeX.length; ++i) {
+ try {
+ http = new ActiveXObject(activeX[i]);
+ break;
+ } catch(e) {}
+ }
+ } finally {
+ return {conn : http, tId : transactionId};
+ }
+ }
+
+ var pub = {
+ request : function(method, uri, cb, data, options) {
+ if(options){
+ var me = this,
+ xmlData = options.xmlData,
+ jsonData = options.jsonData,
+ hs;
+
+ Ext.applyIf(me, options);
+
+ if(xmlData || jsonData){
+ hs = me.headers;
+ if(!hs || !hs[CONTENTTYPE]){
+ initHeader(CONTENTTYPE, xmlData ? 'text/xml' : 'application/json');
+ }
+ data = xmlData || (Ext.isObject(jsonData) ? Ext.encode(jsonData) : jsonData);
+ }
+ }
+ return asyncRequest(method || options.method || "POST", uri, cb, data);
+ },
+
+ serializeForm : function(form) {
+ var fElements = form.elements || (document.forms[form] || Ext.getDom(form)).elements,
+ hasSubmit = false,
+ encoder = encodeURIComponent,
+ element,
+ options,
+ name,
+ val,
+ data = '',
+ type;
+
+ Ext.each(fElements, function(element) {
+ name = element.name;
+ type = element.type;
+
+ if (!element.disabled && name){
+ if(/select-(one|multiple)/i.test(type)){
+ Ext.each(element.options, function(opt) {
+ if (opt.selected) {
+ data += String.format("{0}={1}&",
+ encoder(name),
+ (opt.hasAttribute ? opt.hasAttribute('value') : opt.getAttributeNode('value').specified) ? opt.value : opt.text);
+ }
+ });
+ } else if(!/file|undefined|reset|button/i.test(type)) {
+ if(!(/radio|checkbox/i.test(type) && !element.checked) && !(type == 'submit' && hasSubmit)){
+
+ data += encoder(name) + '=' + encoder(element.value) + '&';
+ hasSubmit = /submit/i.test(type);
+ }
+ }
+ }
+ });
+ return data.substr(0, data.length - 1);
+ },
+
+ useDefaultHeader : true,
+ defaultPostHeader : 'application/x-www-form-urlencoded; charset=UTF-8',
+ useDefaultXhrHeader : true,
+ defaultXhrHeader : 'XMLHttpRequest',
+ poll : {},
+ timeout : {},
+ pollInterval : 50,
+ transactionId : 0,
+
+// This is never called - Is it worth exposing this?
+// setProgId : function(id) {
+// activeX.unshift(id);
+// },
+
+// This is never called - Is it worth exposing this?
+// setDefaultPostHeader : function(b) {
+// this.useDefaultHeader = b;
+// },
+
+// This is never called - Is it worth exposing this?
+// setDefaultXhrHeader : function(b) {
+// this.useDefaultXhrHeader = b;
+// },
+
+// This is never called - Is it worth exposing this?
+// setPollingInterval : function(i) {
+// if (typeof i == 'number' && isFinite(i)) {
+// this.pollInterval = i;
+// }
+// },
+
+// This is never called - Is it worth exposing this?
+// resetDefaultHeaders : function() {
+// this.defaultHeaders = null;
+// },
+
+ abort : function(o, callback, isTimeout) {
+ var me = this,
+ tId = o.tId,
+ isAbort = false;
+
+ if (me.isCallInProgress(o)) {
+ o.conn.abort();
+ clearInterval(me.poll[tId]);
+ me.poll[tId] = null;
+ if (isTimeout) {
+ me.timeout[tId] = null;
+ }
+
+ handleTransactionResponse(o, callback, (isAbort = true), isTimeout);
+ }
+ return isAbort;
+ },
+
+ isCallInProgress : function(o) {
+ // if there is a connection and readyState is not 0 or 4
+ return o.conn && !{0:true,4:true}[o.conn.readyState];
+ }
+ };
+ return pub;
+ }();
+
+
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