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Re: Passing dropdown list value to another SELECT statement on same page
Posted by: Peter Brawley
Date: August 03, 2012 08:22AM

Supposing there are two tables, parent (PK pid, ...) and child (PK cid, FK pid, ...), then at the top you have something like ...

if( isset( $_GET['pid'] )) { 
  $pid = $_GET['pid']; 
  if( $pid != $_SESSION['pid'] ) unset( $_SESSION['cid'] ); 
  $_SESSION['pid'] = $pid; 
elseif( isset( $_SESSION['pid'] )) { 
  $pid = $_SESSION['pid']; 
if( isset( $_GET['cid'] )) { 
  $cid = $_GET['cid']; 
  $_SESSION['cid'] = $cid; 
elseif( isset( $_SESSION['table'] )) { 
  $table = $_SESSION['table']; 

Then further down, the query for child rows matching the pid selected by the user in the parent dropdown is...

select ... from child where pid=$pid;

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