UK Address Search & Validation

 1<!-- Add a div to house your 
 2     postcode input field -->
 3<div id="lookup_field"></div>
 4
 5<!-- This is your existing form -->
 6<label>Address Line One</label>
 7<input id="first_line" type="text" />
 8
 9<label>Address Line Two</label>
10<input id="second_line" type="text" />
11
12<label>Address Line Three</label>
13<input id="third_line" type="text" />
14
15<label>Post Town</label>
16<input id="post_town" type="text" />
17
18<label>Postcode</label>
19<input id="postcode" type="text" />

 1<script>
 2// Add this after your form
 3$('#lookup_field').setupPostcodeLookup({
 4  // Add your API key
 5  api_key: 'ak_hk71kco54zGSgVf9ExxRVVNmolLNh',
 6  // Identify your fields with CSS selectors
 7  output_fields: {
 8    line_1: '#first_line',  
 9    line_2: '#second_line',         
10    line_3: '#third_line',
11    post_town: '#post_town',
12    postcode: '#postcode'
13  }
14});
15</script>