Javascript alert not running in PHP

Question

I am trying to print alert when user is redirected to login-redirect, however the alert isn't working as I want it to, instead it brings the user straight to the login-redirect.

Here's my code:

<script type="text/javascript"src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<?php 
session_start();

if( !isset($_SESSION["loginSuccess"]) ){
   echo "<script type='text/javascript'>alert('Login failed!');</script>";
   header('Location:' . $base_url . 'login-redirect');
}
?>

Possible duplicate of How to fix "Headers already sent" error in PHP — Epodax
– Epodax, Commented Oct 9, 2015 at 10:16
You must place first session_start(); before outputting something on your page. So place session_start(); before outputting html like jquery script tag. — Indrasinh Bihola
– Indrasinh Bihola, Commented Oct 9, 2015 at 10:17
"Javascript alert not running in PHP" Whew! That's a relief. :-) — T.J. Crowder
– T.J. Crowder, Commented Oct 9, 2015 at 10:19
You cannot run Javascript and then expect a redirect header to work. If you must do these two things together, use a Javascript redirect instead. — Simba
– Simba, Commented Oct 9, 2015 at 11:58

Luke Cousins · Accepted Answer · 2015-10-09 11:12:56Z

1

That's just how it works. You're doing a redirect, but it doesn't run the js before redirecting. If you want to run the js then you'll need to do the redirect different using a meta tag or JavaScript, rather than a http header.

answered Oct 9, 2015 at 11:12

Luke Cousins

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Pawel Gumiela · Accepted Answer · 2015-10-09 11:03:01Z

0

The alert is working.

I think your session variable is not set.

edited Oct 9, 2015 at 11:03

Pawel Gumiela

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answered Oct 9, 2015 at 10:39

Aman Goyal

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