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    copied!<p>You should do something like this with <a href="http://jquery.com/" rel="nofollow noreferrer">jQuery</a> + <a href="http://www.json.org/" rel="nofollow noreferrer">JSON</a></p> <p>First of all download jquery from <a href="http://code.jquery.com/jquery-1.4.2.min.js" rel="nofollow noreferrer">here</a> and include it in your application. </p> <p>If <strong>home.php</strong>, your downloaded jquery file(<strong>jquery-1.4.2.min.js</strong>) and <strong>getData.php</strong> are in the same folder then your <strong>home.php</strong> will be look like this:</p> <p><strong>home.php</strong> (file that contain your form)</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script type="text/javascript" src="jquery-1.4.2.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; jQuery(document).ready(function(){ jQuery('#Client_ID').live('change', function(event) { $.ajax({ url : 'getData.php', type : 'POST', dataType: 'json', data : $('#myform').serialize(), success: function( data ) { for(var id in data) { $(id).val( data[id] ); } } }); }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form id='myform'&gt; &lt;select name='Client_ID' id='Client_ID'&gt; &lt;option value=''&gt;Select&lt;/option&gt; &lt;option value='1'&gt;Client 1&lt;/option&gt; &lt;option value='2'&gt;Client 2&lt;/option&gt; &lt;/select&gt; &lt;input type='text' name='address1' id='address1'&gt; &lt;input type='text' name='address2' id='address2'&gt; &lt;select name='gender' id='gender'&gt; &lt;option value=''&gt;Select&lt;/option&gt; &lt;option value='1'&gt;Male&lt;/option&gt; &lt;option value='2'&gt;Female&lt;/option&gt; &lt;/select&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>getData.php</strong></p> <pre><code>&lt;?php $clientId = $_POST['Client_ID']; // Selected Client Id $query = "SELECT Address1, Address2 from Client where Client_ID = $clientId"; $result = mysql_query($query); $row = mysql_fetch_array($result, MYSQL_ASSOC) $add1 = $row[Address1]; $add2 = $row[Address2]; $gender = 1; $arr = array( 'input#address1' =&gt; $add1, 'input#address2' =&gt; $add2, 'select#gender' =&gt; $gender ); echo json_encode( $arr ); ?&gt; </code></pre> <p>I have tested this code on my machine and it is working.</p>
 

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