Can you kill a PHP session through JS?

ziycon

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??

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 function logout() {

    //kill session here ex. session_destory();

}

gits

you may use an ajax-call to call a php-script that does what you want ...

kind regards

ziycon

Any easy tutorials on AJAX you'd recommend, never used i before??

gits

here you will find a simple example and some explaination

kind regards

ziycon

Ok, I've got this far now, I'm not sure how to set it so it works on a click of a link?

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 <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>

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<a href="#" name="logout" onclick="logout(); return false;">Logout</a>

gits

doesn't it work ... from a first quick look it should do?

kind regards

ziycon

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?

gits

the logout.php is called async ... and you will just get a notification in the onreadystatechange-handler of the request, so just echo something in the php-script and alert the responseText, to see that the script is called ...

ziycon

I tried this but nothing:

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 ...

xmlHttp.onreadystatechange=function()

    {

        if(xmlHttp.readyState==4)

        {

            document.logout.value=xmlHttp.responseText;

            alert(xmlHttp.responseText);

        }

    }

...

gits

try the following please:

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 xmlHttp.onreadystatechange = function() {

    if (xmlHttp.readyState == 4) {

        alert(xmlHttp.responseText);

    }

}

gits

simplified example for firefox:

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 <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?

ziycon

@gits
This worked! How do i get it to work without the alert box?

gits

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

ziycon

Ah yes, it's working now in firefox but not in IE??

gits

in case you use your above shown code tho create an instance of the XMLHttpRequest-object it should work. do you get any errors?

ziycon

I got it working in IE was something to do with the cache in IE so it was working the whole time.

One last question, how would you go about adding a redirect on the successful click of logout, would you add it in the JS or the logout.php file?

Thanks again for all your help.

gits

you may use:

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window.location.href = 'whatever_url';

in the onreadystatechange-handler in the JavaScript-code. where the url might be the responseText in case you need that.

kind regards

ziycon

Works perfectly, thanks again!

gits

no problem ... ;) ... you are welcome. post back to the forum anytime you have more questions ...

kind regards

Can you kill a PHP session through JS?

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