adding onsubmit to drupal login forms

Question

hi!

the default login form in drupal doesn't have any javascript to check whether the fields(Username and password) are empty or not before submitting the form. so, i want to add it onsubmit to the user login form..how can i do that?

Answer 1

please read how to theme login block: http://drupal.org/node/19855

And attach to submit button one of these javascript functions: http://www.tizag.com/javascriptT/javascriptform.php

Answer 2

The best way would be to just create a module that adds a .js file (via drupal_add_js()) that does something like this (note: the classes here are just a guess, didn't check the actual class names):

$('.login-form .form-submit').click(function() {
    // your error checking here
});