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POphp error and dropdown needs fixing
 

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    <p>Below is the "Room" table in the database:</p> <pre><code> Room Building Capacity CW5/10 Canalside West 50 CW4/09 Canalside West 40 CW2/08 Canalside West 40 CW4/10 Canalside West 25 CE1/03 Canalside East 40 </code></pre> <p>I am getting this error: </p> <blockquote> <p>Notice: Undefined index: Rooms in /web/stud/u0867587/Mobile_app/create_session.php on line 374</p> </blockquote> <p>which is for this code: </p> <pre><code>foreach ($buildings[0]['Rooms'] as $roomId =&gt; $roomData) </code></pre> <p>So my question is how can the error be fixed (I believe it is because it is trying to find 0 even though my values for building is Canalside East and Canalside West).</p> <p>Below is the full code:</p> <pre><code> $sql="SELECT Building, Room FROM Room WHERE Building = '".$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;select name="buildings" id="buildingssDrop"&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;'; $roomHTML = ""; $roomHTML .= '&lt;select name="rooms" id="roomsDrop"&gt;'.PHP_EOL; $roomHTML .= '&lt;option value=""&gt;Please Select&lt;/option&gt;'.PHP_EOL; foreach ($buildings[0]['Rooms'] as $roomId =&gt; $roomData) { $roomHTML .= "&lt;option value='".$roomId."'&gt;" . $roomId . "&lt;/option&gt;".PHP_EOL; } $roomHTML .= '&lt;/select&gt;'; </code></pre> <p>How can I get the dropdown menus to work so that it displays a list a buildings for one dropdown menu and in second dropdown it will display the list of rooms which belongs to the selected building from the first drop down menu. At the moment this code displays 2 dropdown menus, both only containing the option "Please Select".</p>
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    1. COReading between the lines of what you seem to be doing, I think you probably want to generate the `rooms` select dynamically based on what is selected in the `buildings` select. If this is the case, you are best not trying to do both in the same call, and using AJAX to retrieve the data after the user has selected a value for `buildings`.
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