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  1. PO
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    <p>Are you sure the post value for the building is set.</p> <p>since you told that the sql output shows no value for the building parameter, it is sure that $building will be null. You need to pass the post value to the $building </p> <p>You need to change your code like this:</p> <pre><code>if(isset($_POST['buildings'])){ $building = $_POST['buildings']; } else { $building = ''; } $sql="SELECT Building, Room FROM Room WHERE Building = '".$building."'"; $sqlresult = mysql_query($sql); $buildings = array(); // easier if you don't use generic names for data while($sqlrow = mysql_fetch_array($sqlresult)) { // you need to initialise your building array cells if (!isset($buildings[$sqlrow['Building']])) { $buildings[$sqlrow['Building']] = array('Rooms' =&gt; array()); } // you can add the room to the building 'Rooms' array $buildings[$sqlrow['Building']]['Rooms'][] = $sqlrow['Room']; } $buildingHTML = ""; $buildingHTML = "&lt;form action=\"\" method=\"post\"&gt;"; $buildingHTML .= '&lt;select name="buildings" id="buildingssDrop" onchange="document.getElementById(\'dropDownForm\').submit()"&gt;'.PHP_EOL; $buildingHTML .= '&lt;option value=""&gt;Please Select&lt;/option&gt;'.PHP_EOL; foreach ($buildings as $building =&gt; $buildingData) { $buildingHTML .= "&lt;option value='".$building."'&gt;" . $building . "&lt;/option&gt;".PHP_EOL; } $buildingHTML .= '&lt;/select&gt;'; $buildingHTML .= '&lt;/form&gt;'; $roomHTML = ""; $roomHTML .= '&lt;select name="rooms" id="roomsDrop"&gt;'.PHP_EOL; $roomHTML .= '&lt;option value=""&gt;Please Select&lt;/option&gt;'.PHP_EOL; if(isset($_POST['buildings'])){ $buildingname = $_POST['buildings']; foreach ($buildings[$buildingname]['Rooms'] as $roomId =&gt; $roomData) { $roomHTML .= "&lt;option value='".$roomId."'&gt;" . $roomId . "&lt;/option&gt;".PHP_EOL; } } $roomHTML .= '&lt;/select&gt;'; echo $buildingHTML; echo $roomHTML; </code></pre>
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    1. POList of Buildings and Rooms not appearing in dropdown list
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    1. USSabari
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    1. COStill the same, no difference, still shows 2 dropdown menus that only options in both is "Please Select and that is all
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      1. USuser1170029
    2. COAre you sure the $_POST['buildings'] has some value inside it. Try printing . print_r($_POST);
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      1. USSabari
    3. COI did your print and this is what it prints: Array ( [courseid] => info101 [submit] => Submit ) , it doesn't print anything from Buildings?
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      1. USuser1170029
 

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