- var requestDone = false;
-
- // Create the request object; Microsoft failed to properly
- // implement the XMLHttpRequest in IE7, so we use the ActiveXObject when it is available
- var xml = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
-
- // Open the socket
- xml.open(s.type, s.url, s.async);
-
- // Need an extra try/catch for cross domain requests in Firefox 3
- try {
- // Set the correct header, if data is being sent
- if ( s.data )
- xml.setRequestHeader("Content-Type", s.contentType);
-
- // Set the If-Modified-Since header, if ifModified mode.
- if ( s.ifModified )
- xml.setRequestHeader("If-Modified-Since",
- jQuery.lastModified[s.url] || "Thu, 01 Jan 1970 00:00:00 GMT" );
-
- // Set header so the called script knows that it's an XMLHttpRequest
- xml.setRequestHeader("X-Requested-With", "XMLHttpRequest");
- } catch(e){}
-
- // Allow custom headers/mimetypes
- if ( s.beforeSend )
- s.beforeSend(xml);
-
- if ( s.global )
- jQuery.event.trigger("ajaxSend", [xml, s]);
-
- // Wait for a response to come back
- var onreadystatechange = function(isTimeout){
- // The transfer is complete and the data is available, or the request timed out
- if ( !requestDone && xml && (xml.readyState == 4 || isTimeout == "timeout") ) {
- requestDone = true;
-
- // clear poll interval
- if (ival) {
- clearInterval(ival);
- ival = null;
- }
-
- status = isTimeout == "timeout" && "timeout" ||
- !jQuery.httpSuccess( xml ) && "error" ||
- s.ifModified && jQuery.httpNotModified( xml, s.url ) && "notmodified" ||
- "success";
-
- if ( status == "success" ) {
- // Watch for, and catch, XML document parse errors
- try {
- // process the data (runs the xml through httpData regardless of callback)
- data = jQuery.httpData( xml, s.dataType );
- } catch(e) {
- status = "parsererror";
- }
- }
-
- // Make sure that the request was successful or notmodified
- if ( status == "success" ) {
- // Cache Last-Modified header, if ifModified mode.
- var modRes;
- try {
- modRes = xml.getResponseHeader("Last-Modified");
- } catch(e) {} // swallow exception thrown by FF if header is not available
-
- if ( s.ifModified && modRes )
- jQuery.lastModified[s.url] = modRes;
-
- // JSONP handles its own success callback
- if ( !jsonp )
- success();
- } else
- jQuery.handleError(s, xml, status);