http://snippets.dzone.com/posts Tue, 07 Oct 2008 12:14:04 GMT DZone Snippets: xhconn code http://snippets.dzone.com/posts/show/5416 This code fixes the issue in Firefox where the onreadystatechange event is not called for synchronous XHR requests. It is based on the XHConn script from http://xkr.us/code/javascript/XHConn/, patched with the fix documented at http://lukav.com/wordpress/2007/04/12/firefox-firebug-and-synchronos-calls-problem/ <br /> <br /><code> <br />/** XHConn - Simple XMLHTTP Interface - bfults@gmail.com - 2005-04-08 ** <br /> ** Code licensed under Creative Commons Attribution-ShareAlike License ** <br /> ** http://creativecommons.org/licenses/by-sa/2.0/ **/ <br />/** <br /> * Modified slightly from original to support synchoronous transactions <br /> * CDB 2007-05-16, 2007-06-05 <br /> */ <br /> <br />function XHConn() <br />{ <br /> var xmlhttp, bComplete = false; <br /> try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } <br /> catch (e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } <br /> catch (e) { try { xmlhttp = new XMLHttpRequest(); } <br /> catch (e) { xmlhttp = false; }}} <br /> if (!xmlhttp) return null; <br /> this.connect = function(sURL, sMethod, sVars, fnDone, bAsynch) <br /> { <br /> if (!xmlhttp) return false; <br /> bComplete = false; <br /> sMethod = sMethod.toUpperCase(); <br /> <br /> if (bAsynch == null) bAsynch = true; //treat asynch as an optional argument <br /> <br /> try { <br /> if (sMethod == "GET") <br /> { <br /> xmlhttp.open(sMethod, sURL+"?"+sVars, (bAsynch == true)); <br /> sVars = ""; <br /> } <br /> else <br /> { <br /> xmlhttp.open(sMethod, sURL, (bAsynch == true)); <br /> xmlhttp.setRequestHeader("Method", "POST "+sURL+" HTTP/1.1"); <br /> xmlhttp.setRequestHeader("Content-Type", <br /> "application/x-www-form-urlencoded"); <br /> } <br /> <br /> xmlhttp.onreadystatechange = function(){ <br /> if (xmlhttp.readyState == 4 && !bComplete) <br /> { <br /> bComplete = true; <br /> fnDone(xmlhttp); <br /> } <br /> }; <br /> xmlhttp.send(sVars); <br /> <br /> /** <br /> * Firefox <= 2.0.0 doesn't fire onreadystatechange for synchronous requests. <br /> * See http://lukav.com/wordpress/2007/04/12/firefox-firebug-and-synchronos-calls-problem/ <br /> */ <br /> var isGecko = (document.addEventListener) ? true : false; <br /> try { <br /> if (!bAsynch && isGecko && xmlhttp.onreadystatechange == null) { <br /> bComplete = true; <br /> fnDone(xmlhttp); <br /> return true; <br /> } <br /> } <br /> catch (e) { return false; } <br /> /** <br /> * End synchronous request patch <br /> */ <br /> } <br /> catch(z) { return false; } <br /> return true; <br /> }; <br /> return this; <br />} <br /></code> Mon, 21 Apr 2008 17:35:19 GMT http://snippets.dzone.com/posts/show/5416 ChrisBloom7 (Chris Bloom)