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POtotal price according to quantity written for multiple items
 

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    <p>hello i am making a shopping cart system but i am stuck in the calculations of total products with number of quantities i want that a user selects a price from drop down and then on entering the quantity it updates the total instant and same goes for the other items . i made a js fiddle for the structure can anyone help me achieve this via simple javascript ? </p> <p><a href="http://jsfiddle.net/nVCY4/25/" rel="nofollow">http://jsfiddle.net/nVCY4/25/</a></p> <p>the drop down structure is like </p> <pre><code>&lt;select id="TIPR1" class="table-select" title="Please select"&gt; &lt;option value="31"&gt;Field Box $31&lt;/option&gt; &lt;option value="29"&gt;Lodge Box $29&lt;/option&gt; &lt;option value="19"&gt;Bleachers $19&lt;/option&gt; &lt;/select&gt; function CalculateTotal(frm) { var order_total = 0 // Run through all the form fields for (var i=0; i &lt; frm.elements.length; ++i) { // Get the current field form_field = frm.elements[i] // Get the field's name form_name = form_field.name // Is it a "product" field? if (form_name.substring(0,4) == "TIQT") { // If so, extract the price from the name //item_price = parseFloat(form_name.substring(form_name.lastIndexOf("_") + 1)) var test = "TIPR1,TIPR2"; //test = test + i; var e = document.getElementById(test); item_price = e.options[e.selectedIndex].value; // Get the quantity item_quantity = parseInt(form_field.value) // Update the order total if (item_quantity &gt;= 0) { order_total += item_quantity * item_price } } } // Display the total rounded to two decimal places document.getElementById("order_total").firstChild.data = "$" + } </code></pre>
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    1. COFrom your jsFiddle I can see that your ID's on the `select`s need to be different. The point of an ID is for it to be unique. Use `name` if you want to repeat. Also having duplicate IDs makes it challenging to get to specific elements in pure JS.
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