Prevent button from being double clicked on a form

prevent_double_click

<script type="text/javascript">
    // jQuery plugin to prevent double submission of forms
    jQuery.fn.preventDoubleSubmission = function() {
        $(this).on('submit',function(e){
            var $form = $(this);

            if ($form.data('submitted') === true) {
                // Previously submitted - don't submit again
                e.preventDefault();
                alert('prevented');
            } else {
                // Mark it so that the next submit can be ignored
                $form.data('submitted', true);
                alert('submited');
            }
        });

        // Keep chainability
        return this;
    };
    $('##shippingFormContent').preventDoubleSubmission();
    $('##addToCartForm').preventDoubleSubmission();
</script>


 // jQuery plugin to prevent double submission of forms
    jQuery.fn.preventDoubleSubmit = function() {
        $(this).submit(function (e) {
            var theForm = $(this);
            setTimeout(function () {
                var btn = theForm.find('input[type="submit"]');
                btn.attr('disabled', 'disabled');
                btn.val('Processing');
            }, 5);
            return true;
        });
    };
    $('##addToCartForm').preventDoubleSubmit();

good job