How do I add an onclick event to a column link?

Hello,

I need to add an onclick event to a column link and I’m not sure how to go about it. I have added custom_link as a class to the column and placed this script in my functions.php file but cant seem to get it to work.. Any help would be appreciated.

function trigger_func_on_custom_button(){
?>
<script>
(function($){
    $(window).load(function() {
    	$('.custom_click a').click(function(e){
    		e.preventDefault();
    		var con=confirm("This section of the website is under construction. Click here to continue to the archive site.");
        });
    });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'trigger_func_on_custom_button');