I added this bit of code to my header.php file:

<script type="text/javascript">
$(document).ready(function() {
    if( $('div').hasClass('icheckbox') && $('div').hasClass('disabled') ) {
        $('div').parent().addClass('hide_empty');
    }
});
</script>

My goal is to add the class .hide_empty to the parent of all div elements that have a class .icheckbox AND a class .disabled, in that order, with no other classes. The parent of these div elements is a li element in all cases.

I checked many answers to related questions and tried many variations, but whatever cariation I use, the class .hide_empty is never added to the parent li element.

What am I doing wrong here?

I added this bit of code to my header.php file:

<script type="text/javascript">
$(document).ready(function() {
    if( $('div').hasClass('icheckbox') && $('div').hasClass('disabled') ) {
        $('div').parent().addClass('hide_empty');
    }
});
</script>

My goal is to add the class .hide_empty to the parent of all div elements that have a class .icheckbox AND a class .disabled, in that order, with no other classes. The parent of these div elements is a li element in all cases.

I checked many answers to related questions and tried many variations, but whatever cariation I use, the class .hide_empty is never added to the parent li element.

What am I doing wrong here?

Thanks to the input of both @Andrea and @dhirenpatel22 I came up with the following working code:

In my footer.php I added:

<?php 
    function hide_empty_terms() { ?>
        <script type="text/javascript">
            jQuery(window).load(function() {
                jQuery(".icheckbox.disabled").each(function() {
                    jQuery(this).parent('li').addClass('hide_empty');
                });
            });
        </script>
    <?php }
    add_action('wp_footer', 'hide_empty_terms');
?>

right before <?php wp_footer(); ?>. This actually adds the class hide_empty to the parent li element of <div class="icheckbox disabled">.