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Closing Multiple Browser Windows

Posted on 2006-11-23
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Last Modified: 2008-01-09
Hopefully someone may have an idea here.

We have a C# ASP.NET Application, this app can spawn many child windows from one main window, anything up to 5 levels. What we would really like is if someone clicks on logout on the main window, it knows what children are open and closes these down automatically and logs out on the main window, likewise if the session times out, the next time someone clicks on the app (on any level) it will close down all child windows and logout on the main window. I hope this makes some sort of sense and any ideas would be appreciated.

Thanks
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Question by:coesy
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Expert Comment

by:rangasuman
ID: 18002761
You can achieve this using Javascript.
You would have to keep a reference in the parent window of any child windows opened to achieve this.

<INPUT TYPE=button onClick="child1=window.open ('http://www.google.com','child1')" VALUE="Open">
<INPUT TYPE=button onClick="child2=window.open ('http://www.yahoo.com','child2')" VALUE="Open">
<INPUT TYPE=button onClick="child1.close();child2.close()" VALUE="Close All">

You can add as many as windows you would like with a different reference.
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by:coesy
ID: 18002796
This is ok but with our app any combination of windows could be open and we don't neccessarily know which ones are being used at the time of logout or session end.
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Expert Comment

by:rangasuman
ID: 18003042
I did not understand what do you mean by that. If you dont know how many windows you would like to open, then you need to initialize an array for the reference and then you can loop to close the windows. If you want to selectively close only some windows, you can still do so.
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by:coesy
ID: 18003228
Users open windows by clicking links i don't force any windows to open so i don't know which ones are open, its basically a web app that works like a windows app, so multiple forms could be open at once, its a good idea about the array though, but i am not sure how best to store this between forms, would it be better client side or server side? would you use cookies or something? also how would you know whether a form has been closed by the user or not in order to remove it from the array, i know about the onunload function but this works on both refresh and close? sorry just trying to get it clear in my head.
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Expert Comment

by:rangasuman
ID: 18005420
Since you would like to close all the windows, you can simply use the code snippet written above. If you call a window to close and if does not exist, it should not matter. If you initialise an array, it will be on the client side with in the Javascript code and will be valid till some one closes the main window containing the code. There is no need to store this value in a cookie or any where else. There is no way we can know if a user closes a window and we would know about it. So, I suggest you to not get into array trouble unless you are good at Javascript.
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by:coesy
ID: 18006381
ok, thats fine. so if i keep the array on the main screen via client-side and i add to it a window that pops up from the main screen, what happens if i click on the child 1 window to pop up a child 2 window, will the main screen now know it has a child of a child open?
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Expert Comment

by:rangasuman
ID: 18008716
No that is not quite possible. I ll get back to you with a probable solution, if my test runs successfully.
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Accepted Solution

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LeeKowalkowski earned 500 total points
ID: 18235550
Too late for my solution?  Here's a demo:  

anyWindow.html:
    <ul>
      <li>
        <a href="javascript:open('anyWindow.html');void 0;">Open a window using javascript</a>
      <li>
        <a href="anyWindow.html" target="_blank">Open a window using HTML target attribute</a>
      <li>
        <a href="anyWindow.html">Standard navigation, hold shift to open in a new window, or use context menu.</a>
      <li>
        <a href="javascript:logout();void 0;">logout</a>
        <p>
          Note: The logout link doesn't have to be on every page, and ideally loads a page which contains and calls the logout function as near as possible to the top of the head of the document.
        <p>
          The HREF of the logout link just calls the logout function immediately for demonstration purposes, in a real application, you'll probably want to do some server-side processing first, so just navigate to a logged out page containing the logout script.
    </ul>
    <script>
      var loggedOut = false;

      var isChildWindow = opener && opener.logout;

      if(isChildWindow)
      {
        // check for logout condition 4 times/second.
        setInterval("closeWindowWhenLoggedOut()", 250);
      }

      function closeWindowWhenLoggedOut()
      {
        try
        {
          loggedOut = opener.loggedOut;
        }
        catch(e) // cannot access opener.loggedOut if parent window has been closed.
        {
          loggedOut = true;
        }

        if(loggedOut)
        {
          // close the window.
          opener = null;
          close();
        }
      }

      function logout()
      {
        if(isChildWindow)
        {
          opener.logout();
        }
        else
        {
          goToLogoutPage();
        }
      }

      function goToLogoutPage()
      {
        location.assign("logout.html");
      }
    </script>

logout.html:
    <script>loggedOut = true;</script>
    <p>Thank you for using our application.</p>

- Should work a treat!  Although I don't know what kind of application you're writing, there may be some adverse behaviour, for example:

If the main window opens window-2 which in turn opens window-3 - closing window-2 will also close window-3 - but that might make sense.


So how do you get it to work?  Just put the SCRIPT block in a .js file and include it on every authenticated/application page, pop-ups and main window.  Then the "loggedOut = true" script on the page served when the user has logged out.


Thanks, any problems let me know...  
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Author Comment

by:coesy
ID: 18235914
talk about pulling it out the hat! thats fantastic, just tried it on our application and it done the job perfectly, thanks very much, really appreciate it
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