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    <p>According to your code, you should use this in your <code>select_list.php</code> script:</p> <pre><code>$col = $_POST['col']; $wval = $_POST['wval']; // now you can use those variables to save to DB, or get some data out of DB </code></pre> <p>I assume you want to have cascade <code>&lt;select&gt;</code> elements, you should change your <code>ajaxReq()</code> function:</p> <pre><code>function ajaxReq(col, wval) { // first remove all selects that are after this one var remove = false; var next = null; // we also need to trap next select so we can fill it for (i in ar_cols) { if (ar_cols[i] == col) { remove = true; // from now on, remove lists } else if (remove) { // if ok to remove if (!next) { next = ar_cols[i]; // now we found next column to fill } if (ar_cols[i]) { // remove only non null removeLists(ar_cols[i]); } } } if(wval!='- - -' &amp;&amp; wval!='' &amp;&amp; next) { // also if there is column after to fill var request = get_XmlHttp(); var php_file = 'select_list.php'; var data_send = 'col='+col+'&amp;wval='+wval+'&amp;next='+next; // also add next param request.open("POST", php_file, true); document.getElementById(preid+col).innerHTML = 'Loadding...'; request.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); request.send(data_send); request.onreadystatechange = function() { if (request.readyState==4) { // we fill next select document.getElementById(preid+next).innerHTML = request.responseText; } } } } </code></pre> <p>Your <code>select_list.php</code> should look something like this:</p> <pre><code>$col = $_POST['col']; // this is just a filter for values in next &lt;select&gt; $wval = $_POST['wval']; $next = $_POST['next']; // we need to get this param or we cannot setup next &lt;select&gt; // using $col and $wval variables get values from DB echo '&lt;select name="' . $next . '" onchange="ajaxReq(\'' . $next . '\', this.value);"&gt;'; foreach ($data as $row) { echo '&lt;option ...&gt;...&lt;/option&gt;'; // fix this to work for you } echo '&lt;/select&gt;'; </code></pre> <p>// Code changed due to bug found<br> The ajax request should contain one more parameter (<code>next</code> column) since the returned <code>&lt;select&gt;</code> should have name and onchange event prepared for next, not the currently changed.<br> Check the code above again.</p>
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