How to write select option 'onchange' to sort by?

Question

From a previous thread, David Powers helped me write an array to use to sort from a list/menu of columns from a recordset
$permitted = array('price', 'area');
// check whether the sort_menu variable contains a valid column name
if (isset($_GET['sort_menu']) && in_array($_GET['sort_menu'], $permitted)) {
$sort = $_GET['sort_menu'];
} else {
// set a default column for sorting
$sort = 'price';
?>
This assumes that the columns for sorting are called price and area.
Change these values to suit your setup.
Now you can add ORDER BY $sort to the SQL in the recordset.
I use this with a submit button.
i want to use the 'onchange' feature of the select option and do away with the submit button.
what goes after      onchange=" what goes here?     " 
this is the sql query
"SELECT * FROM rentals_info WHERE rentals_info.active = 'yes' ORDER BY $sort ASC";

Answer 1

That's a JavaScript problem. A quick Google search for "sort table columns javascript" brought up the following tutorial that seems to do very much what you want: http://www.kryogenix.org/code/browser/sorttable/.