Gravity Forms coupon code - steps

Agree that showing coupon codes in the source code is not ideal. Was able to work out a way to add valid codes as a radio button selections in the form editor, set it to admin-only, and retrieve them with ajax for validation against a coupon code input.

Any feedback on ways to improve on this approach appreciated!


___1. Added to header.php above wp_head();___
<script src="http://code.jquery.com/jquery-latest.js"></script>


___2. Created three coupon fields in the form___

a) Available coupon codes (admin only)
   This is a set of valid coupon codes admins can update through the form editor

   Type = Radio buttons
   Properties tab:
      Label = any coupon code (case-insensitive)
      Value = discount amount (flat, not percentage) (check enable values)
   Advanced tab:
      Admin Label = coupon_codes
      Visibility = Admin Only


b) Coupon Code
   This is the field website visitors will type the coupon code into

   Type = Single Line Text

   default settings


c) Coupon Code Amount
   This is where the discount $ amount will show/update

   Type = Product

   Properties tab:
      Field Type = Single Product
      Disable quantity field = checked
   Advanced tab:
      'Allow field to be populated dynamically' = checked, no parameters, needed to allow negative prices



___3. Added code functions.php___
This processes the ajax call from the template

Code here: http://pastebin.com/WAry41pz


___4. Added code to template, right above `wp_footer()`___
This updates pricing depending on what is entered. The adminLabel could be changed to pull other admin-only data out too,

Change the variables to match your form id, the field id of the coupon amount field (product field id) and the $("input_3_18") to match your form id and the coupon input field id.

Code here: http://pastebin.com/fEidLpUW


___Unresolved issues___
* If post the form and there are errors, coupon code field won't update when edited