Hi

I am trying to update a price field when a user enters a specific code and clicks a button.
Ideally, what I would like is for the Discount Value to update to the current form total when the user correctly fills in the Discount Code aand then clicks the Apply Discount button. What I currently have is not working, and any help or alternative suggestions would be greatly appreciated.

Thanks

So far I have the following:
A single line text field "Discount Code" that the user fills in (currently, the code is "secret")
A Button "Apply Discount" with the code onclick="ApplyDiscount();" in the additional attributes
A payment field DiscountValue with a default value of 0.00 (I am using the donation field, but I suppose I could use the single product field)

The following in the Form Javascript section

<script type="text/javascript">
function ApplyDiscount() {
if document.getElementById('DiscountCode').value = "secret" {
document.getElementById('DiscountValue').value = document.getElementById('rsfp_Total').value; }
}
</script>