www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/source/data/Connection.js
/*
* Ext JS Library 2.0.2
* Copyright(c) 2006-2008, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
/**
* @class Ext.data.Connection
* @extends Ext.util.Observable
* The class encapsulates a connection to the page's originating domain, allowing requests to be made
* either to a configured URL, or to a URL specified at request time.<br><br>
* <p>
* Requests made by this class are asynchronous, and will return immediately. No data from
* the server will be available to the statement immediately following the {@link #request} call.
* To process returned data, use a callback in the request options object, or an event listener.</p><br>
* <p>
* Note: If you are doing a file upload, you will not get a normal response object sent back to
* your callback or event handler. Since the upload is handled via in IFRAME, there is no XMLHttpRequest.
* The response object is created using the innerHTML of the IFRAME's document as the responseText
* property and, if present, the IFRAME's XML document as the responseXML property.</p><br>
* This means that a valid XML or HTML document must be returned. If JSON data is required, it is suggested
* that it be placed either inside a <textarea> in an HTML document and retrieved from the responseText
* using a regex, or inside a CDATA section in an XML document and retrieved from the responseXML using
* standard DOM methods.
* @constructor
* @param {Object} config a configuration object.
*/
Ext.data.Connection = function(config){
Ext.apply(this, config);
this.addEvents(
/**
* @event beforerequest
* Fires before a network request is made to retrieve a data object.
* @param {Connection} conn This Connection object.
* @param {Object} options The options config object passed to the {@link #request} method.
*/
"beforerequest",
/**
* @event requestcomplete
* Fires if the request was successfully completed.
* @param {Connection} conn This Connection object.
* @param {Object} response The XHR object containing the response data.
* See <a href="http://www.w3.org/TR/XMLHttpRequest/">The XMLHttpRequest Object</a>
* for details.
* @param {Object} options The options config object passed to the {@link #request} method.
*/
"requestcomplete",
/**
* @event requestexception
* Fires if an error HTTP status was returned from the server.
* See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">HTTP Status Code Definitions</a>
* for details of HTTP status codes.
* @param {Connection} conn This Connection object.
* @param {Object} response The XHR object containing the response data.
* See <a href="http://www.w3.org/TR/XMLHttpRequest/">The XMLHttpRequest Object</a>
* for details.
* @param {Object} options The options config object passed to the {@link #request} method.
*/
"requestexception"
);
Ext.data.Connection.superclass.constructor.call(this);
};
Ext.extend(Ext.data.Connection, Ext.util.Observable, {
/**
* @cfg {String} url (Optional) The default URL to be used for requests to the server. (defaults to undefined)
*/
/**
* @cfg {Object} extraParams (Optional) An object containing properties which are used as
* extra parameters to each request made by this object. (defaults to undefined)
*/
/**
* @cfg {Object} defaultHeaders (Optional) An object containing request headers which are added
* to each request made by this object. (defaults to undefined)
*/
/**
* @cfg {String} method (Optional) The default HTTP method to be used for requests. (defaults to undefined; if not set but parms are present will use POST, otherwise GET)
*/
/**
* @cfg {Number} timeout (Optional) The timeout in milliseconds to be used for requests. (defaults to 30000)
*/
timeout : 30000,
/**
* @cfg {Boolean} autoAbort (Optional) Whether this request should abort any pending requests. (defaults to false)
* @type Boolean
*/
autoAbort:false,
/**
* @cfg {Boolean} disableCaching (Optional) True to add a unique cache-buster param to GET requests. (defaults to true)
* @type Boolean
*/
disableCaching: true,
/**
* <p>Sends an HTTP request to a remote server.</p>
* <p><b>Important:</b> Ajax server requests are asynchronous, and this call will
* return before the response has been recieved. Process any returned data
* in a callback function.
* @param {Object} options An object which may contain the following properties:<ul>
* <li><b>url</b> : String (Optional)<p style="margin-left:1em">The URL to
* which to send the request. Defaults to configured URL</p></li>
* <li><b>params</b> : Object/String/Function (Optional)<p style="margin-left:1em">
* An object containing properties which are used as parameters to the
* request, a url encoded string or a function to call to get either.</p></li>
* <li><b>method</b> : String (Optional)<p style="margin-left:1em">The HTTP method to use
* for the request. Defaults to the configured method, or if no method was configured,
* "GET" if no parameters are being sent, and "POST" if parameters are being sent. Note that
* the method name is case-sensitive and should be all caps.</p></li>
* <li><b>callback</b> : Function (Optional)<p style="margin-left:1em">The
* function to be called upon receipt of the HTTP response. The callback is
* called regardless of success or failure and is passed the following
* parameters:<ul>
* <li><b>options</b> : Object<p style="margin-left:1em">The parameter to the request call.</p></li>
* <li><b>success</b> : Boolean<p style="margin-left:1em">True if the request succeeded.</p></li>
* <li><b>response</b> : Object<p style="margin-left:1em">The XMLHttpRequest object containing the response data. See http://www.w3.org/TR/XMLHttpRequest/ for details about accessing elements of the response.</p></li>
* </ul></p></li>
* <li><b>success</b> : Function (Optional)<p style="margin-left:1em">The function
* to be called upon success of the request. The callback is passed the following
* parameters:<ul>
* <li><b>response</b> : Object<p style="margin-left:1em">The XMLHttpRequest object containing the response data.</p></li>
* <li><b>options</b> : Object<p style="margin-left:1em">The parameter to the request call.</p></li>
* </ul></p></li>
* <li><b>failure</b> : Function (Optional)<p style="margin-left:1em">The function
* to be called upon failure of the request. The callback is passed the
* following parameters:<ul>
* <li><b>response</b> : Object<p style="margin-left:1em">The XMLHttpRequest object containing the response data.</p></li>
* <li><b>options</b> : Object<p style="margin-left:1em">The parameter to the request call.</p></li>
* </ul></p></li>
* <li><b>scope</b> : Object (Optional)<p style="margin-left:1em">The scope in
* which to execute the callbacks: The "this" object for the callback function.
* Defaults to the browser window.</p></li>
* <li><b>form</b> : Object/String (Optional)<p style="margin-left:1em">A form
* object or id to pull parameters from.</p></li>
* <li><b>isUpload</b> : Boolean (Optional)<p style="margin-left:1em">True if
* the form object is a file upload (will usually be automatically detected).</p></li>
* <li><b>headers</b> : Object (Optional)<p style="margin-left:1em">Request
* headers to set for the request.</p></li>
* <li><b>xmlData</b> : Object (Optional)<p style="margin-left:1em">XML document
* to use for the post. Note: This will be used instead of params for the post
* data. Any params will be appended to the URL.</p></li>
* <li><b>jsonData</b> : Object/String (Optional)<p style="margin-left:1em">JSON
* data to use as the post. Note: This will be used instead of params for the post
* data. Any params will be appended to the URL.</p></li>
* <li><b>disableCaching</b> : Boolean (Optional)<p style="margin-left:1em">True
* to add a unique cache-buster param to GET requests.</p></li>
* </ul></p>
* <p>The options object may also contain any other property which might be needed to perform
* postprocessing in a callback because it is passed to callback functions.</p>
* @return {Number} transactionId The id of the server transaction. This may be used
* to cancel the request.
*/
request : function(o){
if(this.fireEvent("beforerequest", this, o) !== false){
var p = o.params;
if(typeof p == "function"){
p = p.call(o.scope||window, o);
}
if(typeof p == "object"){
p = Ext.urlEncode(p);
}
if(this.extraParams){
var extras = Ext.urlEncode(this.extraParams);
p = p ? (p + '&' + extras) : extras;
}
var url = o.url || this.url;
if(typeof url == 'function'){
url = url.call(o.scope||window, o);
}
if(o.form){
var form = Ext.getDom(o.form);
url = url || form.action;
var enctype = form.getAttribute("enctype");
if(o.isUpload || (enctype && enctype.toLowerCase() == 'multipart/form-data')){
return this.doFormUpload(o, p, url);
}
var f = Ext.lib.Ajax.serializeForm(form);
p = p ? (p + '&' + f) : f;
}
var hs = o.headers;
if(this.defaultHeaders){
hs = Ext.apply(hs || {}, this.defaultHeaders);
if(!o.headers){
o.headers = hs;
}
}
var cb = {
success: this.handleResponse,
failure: this.handleFailure,
scope: this,
argument: {options: o},
timeout : o.timeout || this.timeout
};
var method = o.method||this.method||(p ? "POST" : "GET");
if(method == 'GET' && (this.disableCaching && o.disableCaching !== false) || o.disableCaching === true){
url += (url.indexOf('?') != -1 ? '&' : '?') + '_dc=' + (new Date().getTime());
}
if(typeof o.autoAbort == 'boolean'){ // options gets top priority
if(o.autoAbort){
this.abort();
}
}else if(this.autoAbort !== false){
this.abort();
}
if((method == 'GET' && p) || o.xmlData || o.jsonData){
url += (url.indexOf('?') != -1 ? '&' : '?') + p;
p = '';
}
this.transId = Ext.lib.Ajax.request(method, url, cb, p, o);
return this.transId;
}else{
Ext.callback(o.callback, o.scope, [o, null, null]);
return null;
}
},
/**
* Determine whether this object has a request outstanding.
* @param {Number} transactionId (Optional) defaults to the last transaction
* @return {Boolean} True if there is an outstanding request.
*/
isLoading : function(transId){
if(transId){
return Ext.lib.Ajax.isCallInProgress(transId);
}else{
return this.transId ? true : false;
}
},
/**
* Aborts any outstanding request.
* @param {Number} transactionId (Optional) defaults to the last transaction
*/
abort : function(transId){
if(transId || this.isLoading()){
Ext.lib.Ajax.abort(transId || this.transId);
}
},
// private
handleResponse : function(response){
this.transId = false;
var options = response.argument.options;
response.argument = options ? options.argument : null;
this.fireEvent("requestcomplete", this, response, options);
Ext.callback(options.success, options.scope, [response, options]);
Ext.callback(options.callback, options.scope, [options, true, response]);
},
// private
handleFailure : function(response, e){
this.transId = false;
var options = response.argument.options;
response.argument = options ? options.argument : null;
this.fireEvent("requestexception", this, response, options, e);
Ext.callback(options.failure, options.scope, [response, options]);
Ext.callback(options.callback, options.scope, [options, false, response]);
},
// private
doFormUpload : function(o, ps, url){
var id = Ext.id();
var frame = document.createElement('iframe');
frame.id = id;
frame.name = id;
frame.className = 'x-hidden';
if(Ext.isIE){
frame.src = Ext.SSL_SECURE_URL;
}
document.body.appendChild(frame);
if(Ext.isIE){
document.frames[id].name = id;
}
var form = Ext.getDom(o.form);
form.target = id;
form.method = 'POST';
form.enctype = form.encoding = 'multipart/form-data';
if(url){
form.action = url;
}
var hiddens, hd;
if(ps){ // add dynamic params
hiddens = [];
ps = Ext.urlDecode(ps, false);
for(var k in ps){
if(ps.hasOwnProperty(k)){
hd = document.createElement('input');
hd.type = 'hidden';
hd.name = k;
hd.value = ps[k];
form.appendChild(hd);
hiddens.push(hd);
}
}
}
function cb(){
var r = { // bogus response object
responseText : '',
responseXML : null
};
r.argument = o ? o.argument : null;
try { //
var doc;
if(Ext.isIE){
doc = frame.contentWindow.document;
}else {
doc = (frame.contentDocument || window.frames[id].document);
}
if(doc && doc.body){
r.responseText = doc.body.innerHTML;
}
if(doc && doc.XMLDocument){
r.responseXML = doc.XMLDocument;
}else {
r.responseXML = doc;
}
}
catch(e) {
// ignore
}
Ext.EventManager.removeListener(frame, 'load', cb, this);
this.fireEvent("requestcomplete", this, r, o);
Ext.callback(o.success, o.scope, [r, o]);
Ext.callback(o.callback, o.scope, [o, true, r]);
setTimeout(function(){Ext.removeNode(frame);}, 100);
}
Ext.EventManager.on(frame, 'load', cb, this);
form.submit();
if(hiddens){ // remove dynamic params
for(var i = 0, len = hiddens.length; i < len; i++){
Ext.removeNode(hiddens[i]);
}
}
}
});
/**
* @class Ext.Ajax
* @extends Ext.data.Connection
* Global Ajax request class. Provides a simple way to make Ajax requests with maximum flexibility. Example usage:
* <pre><code>
// Basic request
Ext.Ajax.request({
url: 'foo.php',
success: someFn,
failure: otherFn,
headers: {
'my-header': 'foo'
},
params: { foo: 'bar' }
});
// Simple ajax form submission
Ext.Ajax.request({
form: 'some-form',
params: 'foo=bar'
});
// Default headers to pass in every request
Ext.Ajax.defaultHeaders = {
'Powered-By': 'Ext'
};
// Global Ajax events can be handled on every request!
Ext.Ajax.on('beforerequest', this.showSpinner, this);
</code></pre>
* @singleton
*/
Ext.Ajax = new Ext.data.Connection({
/**
* @cfg {String} url @hide
*/
/**
* @cfg {Object} extraParams @hide
*/
/**
* @cfg {Object} defaultHeaders @hide
*/
/**
* @cfg {String} method (Optional) @hide
*/
/**
* @cfg {Number} timeout (Optional) @hide
*/
/**
* @cfg {Boolean} autoAbort (Optional) @hide
*/
/**
* @cfg {Boolean} disableCaching (Optional) @hide
*/
/**
* @property disableCaching
* True to add a unique cache-buster param to GET requests. (defaults to true)
* @type Boolean
*/
/**
* @property url
* The default URL to be used for requests to the server. (defaults to undefined)
* @type String
*/
/**
* @property extraParams
* An object containing properties which are used as
* extra parameters to each request made by this object. (defaults to undefined)
* @type Object
*/
/**
* @property defaultHeaders
* An object containing request headers which are added to each request made by this object. (defaults to undefined)
* @type Object
*/
/**
* @property method
* The default HTTP method to be used for requests. Note that this is case-sensitive and should be all caps (defaults
* to undefined; if not set but parms are present will use "POST," otherwise "GET.")
* @type String
*/
/**
* @property timeout
* The timeout in milliseconds to be used for requests. (defaults to 30000)
* @type Number
*/
/**
* @property autoAbort
* Whether a new request should abort any pending requests. (defaults to false)
* @type Boolean
*/
autoAbort : false,
/**
* Serialize the passed form into a url encoded string
* @param {String/HTMLElement} form
* @return {String}
*/
serializeForm : function(form){
return Ext.lib.Ajax.serializeForm(form);
}
});