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onSubmit='return returnTrueIfAJAXDoesNotWork()' - doesn't wo

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PostPosted: Mon Sep 24, 2007 2:22 pm    Post subject: onSubmit='return returnTrueIfAJAXDoesNotWork()' - doesn't wo Reply with quote

Based on the code at A List Apart, my AJAX code follows the structure outlined below. This is fine in IE, but not in Firefox and I can't figure out what's going on. I have two lines of inquiry:

1. For some reason, Firebug stops stepping through the code after executing the request.open() instruction. However, if I put an alert into the request.onreadystatechange function, or the handler, I still get the alert. Any thoughts why?

2. The above would not be a problem, except that the application doesn't work. I've traced the problem to the form's onsubmit - Firefox doesn't return true to the onSubmit, causing the form to submit, meaning that any visual changes to the page made in the handler disappear. Thus, Firefox appears to execute all the code that results from the sendRequest() instruction, but fails to complete the rest of the code in the loginUser() function - namely the return true; instruction. However, because of the above issue with Firebug, I can't confirm what's going on. Any thoughts?


<form onSubmit="return !loginUser();">

function loginUser() {
   if (request = createHTTPRequest()) {
      sendRequest(request, "POST", loginHandler, url, parameters);
      return true;
   return false

function sendRequest (request, method, loginHandler, url, parameters) {
      request.onreadystatechange = function () {
         if (request.readyState == 4) {
            if (request.status == 200) {
            } else {
               // handle error
      request.open(method, url, true);
      request.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=UTF-8');
   } catch (e) {
      // handle error
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