How to fix this loop thru for Items on page to push to Shopping Cart?

JavaScript
1

When function is called it adds that one product found into the shopping cart.

How can I update this to loop thru for each itme listed on the page, Each Item has a Unique ID (uProdID)?

					//Check if the product already exist in Cart if exist update quantity
					for (var a in productCart) {
						if (productName == productCart[a].productName && giftPrice == productCart[a].productPrice){
							prdQty = productCart[a].productQty++;
							updateCart();
							addToCart();
							//Update Cart Summary Top Header
	                        updateCartSummary();
							return false;
						}
					}

Here is the unique ID & how it is associated.

var prodId = $(this).attr(‘id’);

var onlyProdId = prodId.substring(4);

I know we should be using a each function to loop thru each item on page but this is what we add and it seem incorrect, any help will be great


					//Be sure the Valdiate each Item ID is correct before loading
					//Shopping Cart					
					var productCart = $(product_item_'+uProdID+');
					productCart.each(function(idx, li) {
					var products = a;					
					//Check if the product already exist in Cart if exist update quantity
						for (var a in productCart) {
							if (productName == productCart[a].productName && giftPrice == productCart[a].productPrice){
								prdQty = productCart[a].productQty++;
								alert();
								//updateCart();
								//Update Cart Summary Top Header
								//updateCartSummary();
								return false;
							}
						}
					});