How to get the value of a field in php form on the same page
<p>I am designing a web page. I want to have the options(of another drop-down list on same page) based on the selection made by the user.
I am providing a drop-down list to the user called Application. Depending on the Application, I want to query sql and want to show only the options that are valid for selected Application in another drop-down list.
I want  to get the value of Application on the same page (one that user has selected) and by getting that value will query the sql accordingly.</p>
