jQuery(document).ready(function addbut($){ // This button will increment the value $('.qtyplus').click(function(e){ // Stop acting like a button e.preventDefault(); // Get the field name fieldName = $(this).attr('field'); // Get its current value var currentVal = parseInt($('input[id='+fieldName+']').val()); // If is not undefined if (!isNaN(currentVal)) { // Increment var selectedVariantInventory = window.selInventory; if(currentVal < selectedVariantInventory){ e.preventDefault(); $('input[id='+fieldName+']').val(currentVal + 1); } else { $('input[id='+fieldName+']').val(currentVal); } } else { // Otherwise put a 0 there $('input[id='+fieldName+']').val(1); } }); // This button will decrement the value till 0 $(".qtyminus").click(function(e) { // Stop acting like a button e.preventDefault(); // Get the field name fieldName = $(this).attr('field'); // Get its current value var currentVal = parseInt($('input[id='+fieldName+']').val()); // If it isn't undefined or its greater than 0 if (!isNaN(currentVal) && currentVal > 1) { // Decrement one var selectedVariantInventory = window.selInventory; if(currentVal <= selectedVariantInventory){ e.preventDefault(); $('input[id='+fieldName+']').val(currentVal - 1); } else { $('input[id='+fieldName+']').val(currentVal); } } else { // Otherwise put a 0 there $('input[id='+fieldName+']').val(1); } }); });