Let's say you have a form field that captures the quantity of something, then you need to multiply that quantity by the price.  How does one go about that in Contour?

In a static form this would look something like this:

<form action="processPayment.aspx" method="post" name="registration" id="registration">
    <label for="qtyA" class="label">Quanity Alabel>
    <input name="qtyA" type="text" id="qtyA" /><br />
    <label for="total" class="label">Total Chargelabel>
    <input name="total" type="text" id="total" readonly="true" /><br />
    <input id="submit" type="submit" value="submit" />
form>

<script type="text/javascript">
    var costA = 10;
    var totalCharge = 0;
    $('#qtyA').blur(function () {
        totalCharge = $('#qtyA').val() * costA;
        $('#total').val(totalCharge);
    });
script>

It's not really clear to me how to retrieve the IDs of each individual field in in the Contour implementation. I can obviously inspect the fields and copy&paste the field ID that way, but there ought to be an easier way to obtain the relevant IDs programatically?

I am not familiar with MVC which is likely the biggest hurdle in getting this resolved.

I get that in order to do anything to a form I need to create a customized view for it?
In /umbraco\plugins\umbracoContour\Views\Forms\? Or is that view just for the markup customization?  So lost ... :(