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In the coe below the status of the drop down list is passed to the $q variable and used in an sql query.

 

In what way would I change the code if I wanted to have a second drop down?

 

xmlhttp.open("GET","getuser.php?q="+str,true);

xmlhttp.send();

 

<html>
<head>
<script>
function showUser(str)
{
if (str=="")
 {
 document.getElementById("txtHint").innerHTML="";
 return;
 } 
if (window.XMLHttpRequest)
 {// code for IE7+, Firefox, Chrome, Opera, Safari
 xmlhttp=new XMLHttpRequest();
 }
else
 {// code for IE6, IE5
 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
 }
xmlhttp.onreadystatechange=function()
 {
 if (xmlhttp.readyState==4 && xmlhttp.status==200)
   {
   document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
   }
 }
xmlhttp.open("GET","getuser.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>


<form>
<select name="users" onchange="showUser(this.value)">
<option value="">Select a person:</option>
<option value="1">Peter Griffin</option>
<option value="2">Lois Griffin</option>
<option value="3">Glenn Quagmire</option>
<option value="4">Joseph Swanson</option>
</select>
</form>
<br>
<div id="txtHint"><b>Person info will be listed here.</b></div>


</body>
</html>

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https://forums.phpfreaks.com/topic/273171-2nd-drop-down-list/
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what do you mean? you want the returned data from the ajax call to be in a dropdown? in that case just create a dropdown, like so:

 

 
$personID = $_GET['q'];
//use this $personID in your query
$rs = mysql_query($sql);
$content = '<form><select name="secondDropdown" onchange="anotherFunction(this.value)">';
while ($row = mysql_fetch_assoc($rs)) {
$content .= '<option value="'.$row['ID'].'">'.$row['name'].'</option>';
}
$content .= /// close form
echo $content;

Link to comment
https://forums.phpfreaks.com/topic/273171-2nd-drop-down-list/#findComment-1405825
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