Question

how can i pass a variable from javascript to php using same file

in this example page keeps refreshing and i don’t get to see the result

it works only if i separate the scripts… but i need it somehow like on ajax..

<SCRIPT language="JavaScript"> 
var carname="Volvo";
location.href="http://localhost/put.php?Result=" + carname; 
</SCRIPT>

and this is the seccond part of the script ( they are both in same file )

<?php 
Id = $_GET[Result]; 
echo $dbId;
?>

Answer 1

As Brian said you should put it in a conditional statement.. also your PHP is bad. Try the following

<?php if(isset($_GET["Result"])) : ?>

 // do work with set variable
 <?php $dbID = $_GET["Result"];
  echo($dbID); ?>

 <?php else : ?>
 // "Result" not set
 <SCRIPT language="JavaScript"> 
 var carname="Volvo";
 location.href="http://localhost/put.php?Result=" + carname; 
 </SCRIPT>
 <? endif; ?>

I think this is a good exercise if you’re trying to learn the Ajax method, in the real world I recommend using a framework like jQuery. Of course understanding how this works will help you build better applications in the end.