Auto-Fill password fields when creating new user

Hi everyone,

I am trying to achieve that on load of user-new.php the password is created randomly and gets prefilled. To achieve that I have the following code inside my custom admin plugin:

global $pagenow;
if ($pagenow == "user-new.php") {
    wp_enqueue_script('modify-new-user-create-form-js', plugins_url('/js/role-cca_modify_new_user_create_form.js', __FILE__));
}

The js is loaded properly and inside it I have the following lines:

jQuery(document).ready(function($) {

	var $passwordField1 = $('#pass1');
	var $passwordField2 = $('#pass2');

	var randomPW = Math.random().toString(36).slice(-8);

	$passwordField1.$passwordField2.val(randomPW);

});

Sadly the fields are not filled with the vaule. If I assign the value to a non-password input field it works. So seems to me that wordpress core is denying an automated password insert via javascript for security reasons!? Is that guess right and is there a way to achieve what I want?

Thanks in advance.

Cheers, Kool