var product_container_array = document.querySelectorAll("[data-zs-product-id]"); for(var i=0; i< product_container_array.length; i++) { var label_price_container=product_container_array[i].querySelector("[data-zs-label-price]"); if(label_price_container){ var selling_price_container=product_container_array[i].querySelector("[data-zs-selling-price]"); var label_price=Number(label_price_container.getAttribute("data-zs-label-price")); var selling_price=Number(selling_price_container.getAttribute("data-zs-selling-price")); var discounted_price=label_price - selling_price; var discount_percent=(discounted_price/label_price)*100; discount_percent=discount_percent.toFixed(1); /* Creating new p tag for showing discount */ var paragraph_elem=document.createElement("P"); var text_elem=document.createTextNode("Discount : "+discount_percent+"%"); paragraph_elem.style="margin: auto;font-size: initial;" ; paragraph_elem.appendChild(text_elem); label_price_container.insertAdjacentElement('afterend',paragraph_elem); } }