Can you kill a PHP session through JS?

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  • ziycon
    Contributor
    • Sep 2008
    • 384
    #1

    Can you kill a PHP session through JS?

    I have this function being called when a user clicks on a logout link, but i'm unsure if i can kill the current session by calling session_destory (); from JS??
    Code:
    function logout() {
    //kill session here ex. session_destory();
}
    Tags: None
    • gits
      Recognized Expert Moderator Expert
      • May 2007
      • 5390
      #2
      you may use an ajax-call to call a php-script that does what you want ...

      kind regards

        Comment

        • ziycon
          Contributor
          • Sep 2008
          • 384
          #3
          Any easy tutorials on AJAX you'd recommend, never used i before??

            Comment

            • gits
              Recognized Expert Moderator Expert
              • May 2007
              • 5390
              #4
              here you will find a simple example and some explaination

              kind regards

                Comment

                • ziycon
                  Contributor
                  • Sep 2008
                  • 384
                  #5
                  Ok, I've got this far now, I'm not sure how to set it so it works on a click of a link?
                  Code:
                  <script type="text/javascript">
function logout()
{
var xmlHttp;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX!");
      return false;
      }
    }
  }
  xmlHttp.onreadystatechange=function()
    {
    if(xmlHttp.readyState==4)
      {
      document.logout.value=xmlHttp.responseText;
      }
    }
  xmlHttp.open("GET","logout.php",true);
  xmlHttp.send(null);
 }
</script>
                  Code:
                  <a href="#" name="logout" onclick="logout(); return false;">Logout</a>

                    Comment

                    • gits
                      Recognized Expert Moderator Expert
                      • May 2007
                      • 5390
                      #6
                      doesn't it work ... from a first quick look it should do?

                      kind regards

                        Comment

                        • ziycon
                          Contributor
                          • Sep 2008
                          • 384
                          #7
                          I've gone over all the code and i've put a pop up message in the logout.php file but it's not showing the pop up when i click logout so it's never getting to the logout.php file?

                            Comment

                            • gits
                              Recognized Expert Moderator Expert
                              • May 2007
                              • 5390
                              #8
                              the logout.php is called async ... and you will just get a notification in the onreadystatecha nge-handler of the request, so just echo something in the php-script and alert the responseText, to see that the script is called ...

                                Comment

                                • ziycon
                                  Contributor
                                  • Sep 2008
                                  • 384
                                  #9
                                  I tried this but nothing:

                                  Code:
                                  ...
xmlHttp.onreadystatechange=function()
    {
        if(xmlHttp.readyState==4)
        {
            document.logout.value=xmlHttp.responseText;
            alert(xmlHttp.responseText);
        }
    }
...

                                    Comment

                                    • gits
                                      Recognized Expert Moderator Expert
                                      • May 2007
                                      • 5390
                                      #10
                                      try the following please:

                                      Code:
                                      xmlHttp.onreadystatechange = function() {
    if (xmlHttp.readyState == 4) {
        alert(xmlHttp.responseText);
    }
}

                                        Comment

                                        • gits
                                          Recognized Expert Moderator Expert
                                          • May 2007
                                          • 5390
                                          #11
                                          simplified example for firefox:

                                          Code:
                                          <html>
<script type="text/javascript">
function logout() {
    var xmlHttp;

    xmlHttp = new XMLHttpRequest;
   
    xmlHttp.onreadystatechange = function() {
        if (xmlHttp.readyState == 4) {
            alert(xmlHttp.responseText);
        }
    }
   
    xmlHttp.open("GET", "foo.php", true);
    xmlHttp.send(null);
}
</script>
<body>
    <a href="#" onclick="logout(); return false;">foo</a>
</body>
</html>
                                          and foo.php should just echo/print something. then you should get the printed text in the alert box. do you get any errors?

                                            Comment

                                            • ziycon
                                              Contributor
                                              • Sep 2008
                                              • 384
                                              #12
                                              Originally posted by gits
                                              try the following please:

                                              Code:
                                              xmlHttp.onreadystatechange = function() {
    if (xmlHttp.readyState == 4) {
        alert(xmlHttp.responseText);
    }
}
                                              This worked! How do i get it to work without the alert box?

                                                Comment

                                                • gits
                                                  Recognized Expert Moderator Expert
                                                  • May 2007
                                                  • 5390
                                                  #13
                                                  yes ... the php-script is called and executed ... and you should know whether it does what it should ... in case you wrote it for yourself? ;)

                                                  kind regards

                                                    Comment

                                                    • ziycon
                                                      Contributor
                                                      • Sep 2008
                                                      • 384
                                                      #14
                                                      Ah yes, it's working now in firefox but not in IE??

                                                        Comment

                                                        • gits
                                                          Recognized Expert Moderator Expert
                                                          • May 2007
                                                          • 5390
                                                          #15
                                                          in case you use your above shown code tho create an instance of the XMLHttpRequest-object it should work. do you get any errors?

                                                            Comment

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