var timeout;

jQuery('div.woocommerce').on('change keyup mouseup', 'input.qty, select.qty', function(){ // keyup and mouseup for Firefox support
	if (timeout != undefined) clearTimeout(timeout); //cancel previously scheduled event
	if (jQuery(this).val() == '') return; //qty empty, instead of removing item from cart, do nothing
	timeout = setTimeout(function() {
		jQuery('[name="update_cart"]').trigger('click');
	}, acauPhpVars.acau_update_delay ); // schedule update cart event with delay in miliseconds specified in plugin settings
});