onchange submit form code example

Example 1: select form submit onchange

<select onchange="this.form.submit()">
    ...
</select>

Example 2: checkbox onchange submit form

<form method='post' action='#'>
<input type='checkbox' name='checkbox' onChange='submit();'
<?php if($page->checkbox_state == 1) { echo 'checked' }; ?>>
</form>