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    copied!<p>Spent the afternoon learning how to do this and it's working quite well. Posted the new code here for others....</p> <p>Thanks to <a href="http://forum.codecall.net/topic/59341-php-sql-jquery-and-ajax-populate-select-boxes/" rel="nofollow">http://forum.codecall.net/topic/59341-php-sql-jquery-and-ajax-populate-select-boxes/</a> for the tutorial.</p> <p>And thanks to everyone here. </p> <p>PHP to build for the first :</p> <pre><code>function agency_select() { include('../include/dbase.php'); $agencies = $pdo-&gt;query("SELECT * FROM agency WHERE Status='active' ORDER BY AgencyName"); $opt = ''; while ($age_array = $agencies-&gt;fetch(PDO::FETCH_ASSOC)) { $opt .= '&lt;option value="'.$age_array['AgencyId'].'"&gt;'.$age_array['AgencyId'].' - '.$age_array['AgencyName'].' - '.$age_array['AgencySuburb'].'&lt;/option&gt;'."\n\t\t\t\t\t\t\t"; } return $opt; } </code></pre> <p>HTML for the two elements:</p> <pre><code>&lt;label for="AgencyId"&gt;Client/Agency:&lt;/label&gt; &lt;select class="uniform" id="AgencyId" name="AgencyId" style="width: 400px; overflow-x: hidden"&gt; &lt;?php echo agency_select(); ?&gt; &lt;/select&gt; &lt;label for="Contact"&gt;Contact: &lt;/label&gt; &lt;select class="uniform" id="Contact" name="Contact" style="width: 300px; overflow-x: hidden"&gt; &lt;option value=""&gt;----Select Client/Agency----&lt;/option&gt; &lt;/select&gt; </code></pre> <p>AJAX file:</p> <pre><code>if(isset($_POST['AgencyId'])) { include('../include/dbase.php'); $option = '&lt;option value=""&gt;----Select Contact----&lt;/option&gt;'; $query = $pdo-&gt;prepare("SELECT * FROM client WHERE AgencyId= ? AND Status='active' ORDER BY FirstName"); $result = $query-&gt;execute(array($_POST['AgencyId']))); while ($row = $result-&gt;fetch(PDO::FETCH_ASSOC)) { $option .= '&lt;option value="'.$row['id'].'"&gt;'.$row['FirstName'].' '.$row['LastName'].'&lt;/option&gt;'; } echo $option; } </code></pre> <p>jQuery:</p> <pre><code>$(document).ready(function () { update_contacts(); }); function update_contacts() { $('#AgencyId').change(function() { $('#Contact').fadeOut(); $('#loader').show(); $.post('../ajax/ajax_contact_select.php', { AgencyId: $('#AgencyId').val() }, function (response) { setTimeout("finishajax('Contact', '"+escape(response)+"')", 400); }); return false; }); } function finishajax(id,response) { $('#loader').hide(); $('#'+id).html(unescape(response)); $('#'+id).fadeIn(); } </code></pre>
 

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