javascript - Ajax not working in firefox without alert -

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function processajaxstatechangeforrowadd() {     alert(0);     if (req.readystate == 4) { // complete         if (req.status == 200) { // ok response             processforrowadd(req.responsetext);         } else {             alert("problem: " + req.statustext);         }     } }

this code working fine ie, safari , firefox, if remove alert, code not work in firefox, though still works in ie , safari.

can give me suggestion why not working in firefox without alert?

edit: code adds row:

if (window.xmlhttprequest && browserversion.indexof("microsoft") == -1 ) {     // code firefox, chrome, opera, safari     req = new xmlhttprequest("");     if (req) {         ajaxprocessed = false;         req.onreadystatechange = processajaxstatechangeforrowadd;         req.open("post", url, true);         req.send();         // alert("1");     } }

the alert blocking. means script temporarily suspended (even if it's few milliseconds). during time, ajax request completes , req object being set. can add delay (using settimeout) callback verify this.

i suggest post more of script can set callback properly. alternatively, use library such jquery set ajax calls in cross-browser manner easily.

edit: need either declare req global variable, or use anonymous function. following code demonstrates first method (using global variable):

var req; if (window.xmlhttprequest) {     req = new xmlhttprequest();     if (req) {         req.onreadystatechange = processajaxstatechangeforrowadd;         req.open("post", url, true);         req.send();     } }  function processajaxstatechangeforrowadd() {     if (req.readystate == 4) { // complete         if (req.status == 200) { // ok response             processforrowadd(req.responsetext);         } else {             alert("problem: " + req.statustext);         }     } }

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