使用AJAX / PHP无法多次增加会话变量

Question

I have tried several ways to try and update this session variable more than once (ie to make it increment for EACH click rather than just the first one), but it is not working.

<script>
$(document).ready(function(){
    $('.nextWeek').on('click', function(){
        $.post ('incrementWeek.php', function (response) {
            location.reload();
        });

        location.reload();
    });
});
</script>

I'm trying to increment the $_SESSION['idn'] variable for reuse after makes a click on a certain button/link. "incrementWeek.php" is simply:

<?php
    session_start();
    $session = $_SESSION['idn'];
    $session++;
    $_SESSION['idn'] = $session;
?>

Few quick answers to common questions: session_start() is the first thing under the first PHP tag, the $_SESSION['idn'] variable is set earlier in the file, but I use an if structure like this:

if (isset($_SESSION['idn'])) {

}

else {
    $id = getIDFromDate($connection, $currentSunday);
    $_SESSION['idn'] = $id;
}

I tried using an alert to see if the variable changes, but it stayed the same. After the first page load, AJAX (I suppose?) does not even acknowledge that I am clicking the "nextWeek" class button. The page does not reload meaning location.reload() was not executed.

Any ideas are appreciated.

EDIT: Thank you. I have edited the code above from everyone's feedback and now it does not reload the page at all and the $_SESSION variable does not update. Is there something wrong syntactically?

Answer 1

$_SESSION['idn']++ is not correct. You should do this instead:

$session = intval($_SESSION['idn']);
$session++ ;
$_SESSION['idn'] = $session;

Answer 2

Setting session variable requires redirection after setting the value in it.

By this logic , becuase you are setting the session using the ajax call, you will not be able to redirect on server side to any url and hence you session variable is not getting set up.

I think your need is to reuse the link clicked count somewhere for some purpose, what you can do here is as an alternate solution is to set your click count in the same ajax server side php file ie incrementWeek.php, but not using the session instead try using the cookie in php

Answer 3

Your code should be:

<script>
$(document).ready(function(){
    $('.nextWeek').on('click', function(){
        $.post ('incrementWeek.php', function (response) {
            location.reload();
        });

       // location.reload(); // <-- remove this as it is not required
    });
});
</script>

And

<?php
   session_start();
   if(isset($_SESSION['idn']))
   {
     $_SESSION['idn'] = $_SESSION['idn'] + 1;
   }
?>

Answer 4

TO use php inside javascript, you need to open php

 <script>
  $(document).ready(function(){
    $('.nextWeek').on('click', function(){
    // dont do this 
     <?php  $_SESSION['idn']++; ?>
     // instead use a ajax 
      $.ajax({
    url: '/path/to/file',
    type: 'GET',
    data: {"session_increment":1},
    success:function(response){
        if(response==1)
        {
            location.reload();
        }
       }
     });
    });
   });

this will work, and will increment the value