Add AutoComplete to WHMCS Admin Forms

autocompletedisable.php

<?php

/**
 * Function to add hidden text / password fields for autofillers to use instead
 */
add_hook( 'AdminAreaHeadOutput', 1, function( $vars ) {
   return <<< HTML
<input type="text" style="display:none">
<input type="password" style="display:none">
HTML;
});


/**
 * Function to apply autocomplete="off" to input fields
 */
add_hook( 'AdminAreaFooterOutput', 1, function( $vars ) {
    return <<< HTML
<script type="text/javascript">
jQuery(document).ready( function() {
    jQuery('input').attr('autocomplete','off');
});
</script>
HTML;
});