Magento – Magento 1.9 :- Add to Cart Helper – not working

This is what we do:

When a user clicks 'add to cart' the button is disabled and the box is greyed out. A ' loading.gif ' is displayed onto the page during an Ajax request. When this Ajax request is over the button is re-enabled and the ' loading.gif ' is once again hidden. The cart on the page is then updated and a 'successfully added to cart' message is displayed to the user.

This way the user gets feedback about their actions -- and the consequence of that exact action.

Below is an example of a javascript function that will disable it's own button, display a "loading .gif" for the user, submit the form, and reenable itself once it's execution is complete:

<script type="text/javascript">
    productAddToCartForm.submit = function (button, url) {
                var data = jQuery('#product_addtocart_form').serialize();
                data += '&isAjax=1';

                //this shows a small .gif that tells the user a process is taking place
                jQuery('#ajax_loader').show();

                //this disables the add to cart button
                jQuery('#buttonAddToCart').prop("disabled", true);

                try {
                    jQuery.ajax({
                        url: url,
                        dataType: 'json',
                        type: 'post',
                        data: data,
                        success: function (data) {

                            //this hides the processing .gif
                            jQuery('#ajax_loader').hide();

                            //this removes the 'disable' on the add to cart button
                            jQuery('#buttonAddToCart').prop('disabled', false);
                        }
                    });
                } catch (e) {
                }
                this.form.action = oldUrl;
            }
        }
    }
</script>

The solution (for no clarified reason) was to enable all Magento caching options. This solved the issue for me.

Tested this again in a new install: Fresh Luma templated with new product widget on the front page, with caching disabled. The 'Add to Cart' button wouldn't function as expected.

Enabled all Magento2 caching options, and the problem was immediatly fixed