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Firefox Submitting Form

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I have 3 of your books and am considering 2 more. Thanks!


I have really been struggling with AJAX.


One of the main things that is causing me problems is that Firefox insists on submitting the form(s) even when I return a "false" from the javascript. The only way I have been able to stop this is by getting rid of the submit inputs which means I have to use workarounds, like a button input, for all the scripts from your book to deal with the changes to the form. I have been able to get an autocomplete search to work, so I'm not completely failing, but this has become more problematic with the scripts to add a record to a database table.


This is what I currently have for one of my scripts:


record add form:


<form method="post" id="member_add_form_ajax" onsubmit="member_add_xml()">


<input type="submit" value="Add Member" >


..text field inputs....




Then for the javascript:



function member_add_xml()


// Calls the ajax object from ajax.js

var member_add_ajax = getXMLHttpRequestObject();


// Check for ajax object; if none, don't use AJAX



// Check to see if the page has an element with an id of "results"



//window.alert('hello 1');


return false;





It reaches the window.alert, so I know it's getting that far. But the form submits.


Obviously, this code doesn't do anything, I've taken out everything between the window.alert and the return false; so that I can see if I can get the form to stop submitting without anything to trip it up.


If I could at least get the form to stop submitting, I would then not have to modify your scripts so much and could possibly get it to work.


Thank you for any help!



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Jack, the reason it's not working is because you need to set up an onsubmit event handler for the form. Here's a basic example that will work in Firefox.

(Please note that this example will not work in IE, because of the way I'm setting up the Ajax object.)



<!DOCTYPE html>

<html lang="en">


   <meta charset="UTF-8">

   <title>Ajax form submit test</title>



   <form action="#" method="#" id="theForm">

     <input type="text">

     <input type="submit" value="Submit">



     var ajax = new XMLHttpRequest();

     document.getElementById('theForm').onsubmit = function () {

       if (ajax) {

         // Make your Ajax request here.

         alert('It works, and the form is not submitted the traditional way.');

         return false;







Hopefully you can modify my code to make it work for your project. Good luck.

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Hey Jack,


Thanks for the nice words on the books. It is appreciated. Not to do a hard sell, but you may want to consider my JavaScript book, which just came out (http://amzn.to/wsdmkq). In it I talk about how to prevent default event behaviors. The approach you use depends upon how the event handler is set up in the first place, as HartleySan suggested.

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  • 1 month later...

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