Using onchange to populate select list with PHP

[r00ttap]

I'm not asking if PHP can replace onchange, I just want to know why this won't submit or if it will even work with sending values to PHP.

 

<form name="sort" method="post" action="<?php $_SERVER['PHP_SELF'] ?>">
            <select name="dselect" onchange="document.sort.sort()">
            	<?php while($row=mysql_fetch_assoc($department)) { echo "<option value='$row[dcode]'>$row[dcode]</option>"; } ?>
            </select>
            <noscript><input type="submit" name="sort" value="Sort" /></noscript><br />
        	<select name="course_name" size="7" style="width: 500px">
			<?php 
					if($sort) {
						while($c = mysql_fetch_object($run_get_course)) {
						echo "<option>$c->dcode$c->number - $c->title </option>";
						}
					} else {
						echo "<option>Please select a department to sort the courses</option>";
					  }
			?>
            </select>
            </form>

 

 

I want the first select "dselect" which selects a department to populate the second select list with the courses within that department. I have a feeling that the onchange is not working because I don't see the browser refreshing at all. What can be done here? Is it just a naming issue?

[JonnoTheDev]

You need to look at your JS function. get it to display an alert() when the function runs to test the call.

You would also be better using an AJAX approach for this issue rather than reloading your pages.