How to check PHP codeigniter session value null or not on a button click using jquery?

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how to check session value null or not on a button click ? if session value is null then i need to show an alert message to select that particular value for the session. i want to do it using jquery. how can i do it ? using jquery i can show the the alert message but can not check the sessio value.

What I have tried:

JavaScript

$( ".checkout-button" ).click(function() {
        alert( "alert message" );
    });

Posted 20-Nov-16 18:43pm

Member 12702853

Updated 21-Nov-16 8:53am

v3

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Mohtshm Zubair · Answer 1 · 2016-11-21T08:53:00

Suppose that you want to check name in userdata then make a page with name checksession.php with this code

PHP

<?php echo isset($_SESSION['some_name']);        ?>

then in jquery put this code inside click handler

     $( ".checkout-button" ).click(function() {
        $.get( "checksession.php", function( data ) {
          if(data==="TRUE")
           {
              //session found stuff
              alert('session exist');
           }
          else{
              //session not found stuff
              alert('session not exist');
          }

        });
}