Gravity Forms: Add Address Validation to your Forms

This guide outlines how to attach address autocompletion to your WordPress Gravity Forms pages.

This integration works by hooking into Gravity Forms' custom HTML field.

Features

• Bind address autocompletion to your address fields
• Add one or more postcode lookup fields

Screenshots

Postcode Lookup

Address Autocomplete

Links

• Address Autocomplete Plugin Documentation
• Postcode Lookup Plugin Documentation
• Gravity Forms

Support

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

Installation

This integration works by hooking into Gravity Form's custom HTML fields. Below are the instructions to add Postcode Lookup or Address Autocomplete.

Create Address Inputs

Add address input fields to your form. These should be created using Single Line Text fields found under Standard Fields.

A basic address form to capture a correct UK address requires the following fields:

• Address line one
• Address line two
• Address line three
• Post town
• Postcode

You can optionally include additional fields, which are documented here.

Note the Field ID number for each address field in the Single Line Text panel. You will need this later to configure the Postcode Lookup Plugin and/or Autocomplete Plugin.

Add Address Autocomplete

Install Plugin

Add a HTML field at the top of your form and add the Autocomplete Plugin script tag.

    <script 
        src="https://cdn.jsdelivr.net/npm/ideal-postcodes-autocomplete@0.2.1/dist/ideal-postcodes-autocomplete.min.js"
        integrity="sha256-lZPaPHBx7V2Gj9iAc8QfVcW02KlWB2gbrqXpGfiEGgo=" 
        crossorigin="anonymous"></script>

    <link 
        rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ideal-postcodes-autocomplete@0.2.1/css/ideal-postcodes-autocomplete.css" 
        integrity="sha256-ewtQO/9EEPz6LsP/kWLv+bzykzIAr+d6s0WqA2B4clQ=" 
        crossorigin="anonymous">

Initialise Autocomplete

Create a new HTML field. Add the Autocomplete initialisation code.

    <script>
    jQuery(function () {
        new IdealPostcodes.Autocomplete.Controller({
            inputField: 'input[name="input_24"]',
            api_key: "iddqd",
            outputFields: {
                line_1: 'input[name="input_24"]',
                line_2: 'input[name="input_30"]',
                line_3: 'input[name="input_32"]',
                post_town: 'input[name="input_33"]',
                postcode: 'input[name="input_34"]',
            }
        });
    });
    </script>

You can optionally override CSS styles in the same HTML field. E.g.

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

Take special care to:

1. Insert your API Key in the api_key field
2. Update the input field names of your target fields. If your Address Line One Field ID is 24, this line should be replaced with 'input[name="input_24"]'. Do this for all the address fields you wish to include
3. Ensure inputField points to the same field as line_1

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

    outputFields: {
        line_1: 'input[name="input_24"]',
        line_2: 'input[name="input_30"]',
        line_3: 'input[name="input_32"]',
        post_town: 'input[name="input_33"]',
        county: 'input[name="abcde"]',
        postcode: 'input[name="input_34"]'
    }

Add Postcode Lookup

Install Plugin

Add a HTML at the top of your form an add the Postcode Lookup plugin script tag.

    <script 
        src="https://cdn.jsdelivr.net/npm/jquery-postcodes@3.0.8/dist/postcodes.min.js" 
        integrity="sha256-JZSN3ZEXOFlpSMFjQkHjbKnjHlsFVf8N7p1SbCI0XHI=" 
        crossorigin="anonymous">
    </script>

Add Postcode Lookup HTML elements

Create a new HTML Content field above your first address field. This will provision the postcode search field, search button and address dropdown for the plugin.

    <div>
        <!-- Postcode search field will appear below -->
        <div>
            <input 
              type="text" 
              placeholder="Lookup your postcode"
              id="idpc_input" />
        </div>
        <!-- Search button will appear below -->
        <div>
            <input 
              type="button" 
              id="idpc_button" 
              value="Lookup Postcode" />
        </div>
        <!-- Address dropdown field will appear below -->
        <div id="idpc_dropdown"></div>
        <!-- Any error messages will appear here -->
        <div id="idpc"></div>
    </div>

You can also append the HTML above with styles that suite your theme. The following snippet styles the postcode lookup fields according to the default Gravity Forms theme.

    <div class="gform_wrapper">
        <div class="ginput_container ginput_container_text">
            <input 
              type="text" 
              placeholder="Lookup your postcode"
              class="medium" 
              id="idpc_input" />
        </div>
        <div class="gform_footer" style="margin: 0;">
            <input 
              type="button" 
              id="idpc_button" 
              class="gform_button button" 
              value="Lookup Postcode" />
        <div id="idpc_dropdown" style="margin-top: 1em"></div>
        <div id="idpc"></div>
    </div>

Initialise Postcode Lookup

Create a new HTML Content field Add the Postcode Lookup initialisation code.

    <script>
      jQuery(function () {
        jQuery("#idpc").setupPostcodeLookup({
          api_key: "You API Key goes here",
          output_fields: {
            line_1: 'input[name="input_24"]',
            line_2: 'input[name="input_30"]',
            line_3: 'input[name="input_32"]',
            post_town: 'input[name="input_33"]',
            postcode: 'input[name="input_34"]'
          },
          button: "#idpc_button",
          input: "#idpc_input",
          dropdown_container: "#idpc_dropdown"
        });
      });
    </script>

Take special care to:

1. Insert your API Key in the api_key field
2. Update the input field names of your target fields. If your Address Line One Field ID is 24, this line should be replaced with 'input[name="input_24"]'. Do this for all the address fields you wish to include
3. Ensure button, input and dropdown_container matches the IDs of the lookup button, lookup field and address dropdown container in the fields created in Step 2
4. Ensure the string in the second line jQuery("#ID") matches the ID of the last <div>. E.g. if <div id="idpc"></div>, the code should read jQuery("#idpc").setupPostcodeLookup(...)

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

    output_fields: {
        line_1: 'input[name="input_24"]',
        line_2: 'input[name="input_30"]',
        line_3: 'input[name="input_32"]',
        post_town: 'input[name="input_33"]',
        county: 'input[name="abcde"]',
        postcode: 'input[name="input_34"]'
    }

Testing

Your first key on your Ideal Postcodes account will carry a free test balance which you can use to verify and test your integration. Please contact support if you need a larger test balance.

Going Live

In order to go live, you will need to purchase a balance of lookups on your API Key. This can be done manually or automated from your dashboard. Each address search consumes one lookup from your key balance.

See our account setup guide for the quickest way to go live by creating your first API Key and enabling automated top-ups.

Configuration

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

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

API Key

Your API Key is central to how our service recognises your integration. See our guide on API Keys to find out more.

API Keys can also be safeguarded against potential misuse, please see our guide on securing your API Key to find out more.