Question

I am working on an Ajax project. There are many functions that could be implemented if we could run javascript function from php script like this:

   <?php

   if(isset($_REQUEST['change-div))
   {
   echo'<script>  UpdateDiv("divId"); // function to change the text of the div on ajax page
   </script>';
   }

   ?>

But it doesn’t work the javascript code is just echoed as it is and the function doesn’t run. I have tried my best, searched online etc. But there seems no way to do it.

Is there a way to run a JavaScript function from PHP script?

Answer 1

you should manage the code execution on client-side. let say your php script called via ajax is

?php
   if(isset($_REQUEST['change-div'])) {
      echo 'UpdateDiv';
      exit();
   }
?>

Then your Ajax success callback (I’m framework agnostic here) could be simply

...
success : function(response) {
    if (response === 'UpdateDiv') {
       UpdateDiv();
    }
}

In this way you will keep client-side and server-side logic well separated. You won’t also need to inject javascript code (changing your DOM structure) or use eval()