Question

I am trying to deactivate the use of space bar while the user is entering his/her username in a textfield.

I tried this code which I got it from here deactivate space bar in js , which did not work at all with me, here is the JS code:

$('#checkusername').keydown(function(e) {
    if (e.keyCode == 32) {
        return false;
    }
});

and here is my textfield text:

<input class="input_field_12em required userUserName" name="userUserName" id="checkusername">

Answer 1

I have replaced the return false; with e.preventDefault() and it’s working fine for me:
http://jsfiddle.net/wpJKj/1/