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Calculated Fields Form Address Validation | Documentation

Calculated Fields Form Integration

Integrate Address Validation to Your WordPress Calculated Fields Form Pages.


If you need support, you can either reach out to us on our support page or drop by our developer chat page.


Address Finder

Activate Address Finder on your address collection forms-screenshot


This integration works by adding our Address Validation tools using CFFs's form editor. Below are the instructions to add Postcode Lookup or Address Finder.

Create Address Inputs

Add address input fields to your form. Use the form editor's Single Line Text. A basic address form to capture a correct UK address should have the following fields:

  • Address line one (required)
  • Address line two
  • Address line three
  • Post town (required)
  • Postcode (required)

Create address fields-screenshot

You can optionally include additional fields, which are documented in the PAF documentation page.

Add Address Finder

Install and Initialise Plugin

Add the form's shortcode on the page.

Create a html block and add the two script tags at the bottom of your form to load the plugin and then to initialise it.

<script src=""></script>

document.addEventListener("DOMContentLoaded", function () {{
apiKey: "ak_test",
outputFields: {
line_1: 'input[name="fieldname3_1"]',
line_2: 'input[name="fieldname7_1"]',
line_3: 'input[name="fieldname6_1"]',
post_town: 'input[name="fieldname5_1"]',
postcode: 'input[name="fieldname4_1"]'

Add the Address Finder Plugin-screenshot

You can optionally override CSS styles in the form editor. E.g.

@media only screen and (min-width: 641px) {
ul.idpc_ul {
min-width: 0 !important;
width: calc(50% - 8px);

Take special care to:

  1. Insert your API Key in the apiKey field
  2. Match the names of your target fields. If your Address Line One has the fieldname tag fieldname3, ensure that line_1 reads fieldname3_1

If you wish to add an additional field, include the parameter name from our documentation. For instance, adding a county field with name county will look like:

outputFields: {
line_1: 'input[name="fieldname1_1"]',
line_2: 'input[name="fieldname2_1"]',
line_3: 'input[name="fieldname3_1"]',
post_town: 'input[name="fieldname4_1"]',
postcode: 'input[name="fieldname5_1"]'
uprn: 'input[name="fieldname6_1"]'


See our Address Finder Plugin Documentation if you wish to customise Address Finder.

See our Postcode Lookup Plugin Documentation if you wish to customise Postcode Lookup.