Script to make the Donation_Designation field required in a donation page. The Donation_Designation field is usually optional, but there are some use cases, particularly when the field is a dropdown, where it needs to be required.

donation_designation_required.html

<script type="text/javascript">
$(document).ready(function() {
    var required = $('*[name=required]');
    var val = required.val();
    if (val.indexOf('Designation_Code') == -1) {
        val = val + "Designation_Code,";
        required.val(val);
    }
});
</script>