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check the parent frame's name and make decisions based on it

Posted on 2010-09-20
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Last Modified: 2012-06-22
Hi Expert,

Is it possible to retrieve the name of a parent frame and make decisions based on that value?

Let's say I put code in the child frame that checks the name of the parent and if it is not "parent.htm" it reloads the page within in the “parent.htm” parent page?

I know I should no longer use frames but in this old site I just need to.

Thanks,

Gurbe

 
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Comment
Question by:Steynsk
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12 Comments
 
LVL 108

Expert Comment

by:Ray Paseur
Comment Utility
Maybe a better design strategy would be to pass a GET string to the script that runs in the inner frame.
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LVL 108

Expert Comment

by:Ray Paseur
Comment Utility
IIRC, this should work, too.
<?php // RAY_timestamp_handshake_parent.php 

error_reporting(E_ALL);



// DEMONSTRATE HOW TO USE A HANDSHAKE BETWEEN A MAIN WEB PAGE AND AN IFRAME.

// IF THE IFRAME IS NOT CALLED FROM THE MAIN WEB PAGE, IT WILL REDIRECT TO

// THE MAIN WEB PAGE.  THE STRATEGY USES A TIMESTAMP TWO SECONDS IN THE FUTURE

// AS A KEY TO UNLOCK THE IFRAME.



// ALWAYS START THE SESSION UNCONDITIONALLY ON EVERY PAGE

session_start();



// SET THE WINDOW OF OPPORTUNITY

$_SESSION["tm"] = time() + 2;



?>

<html>

<head><title>PARENT</title></head>

<body>

<p>THIS IS THE PARENT PAGE</p>

<p>HERE IS THE IFRAME, RIGHT BELOW</p>



<iframe src="/RAY_timestamp_handshake_child.php"></iframe>



<p>THAT IS THE IFRAME, UP THERE</p>

</body>

</html>

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LVL 108

Expert Comment

by:Ray Paseur
Comment Utility
Here is the other part of the demonstration script.

HTH, ~Ray
<?php // RAY_timestamp_handshake_child.php

error_reporting(E_ALL);



// THIS IS THE CHILD SCRIPT IN THE IFRAME



// ALWAYS START THE SESSION UNCONDITIONALLY ON EVERY PAGE

session_start();



// IF THE TIMESTAMP IS FILLED IN

if (isset($_SESSION["tm"]))

{

    // IF THE TIMESTAMP IS STILL IN THE RANGE

    if ($_SESSION["tm"] > time())

    {

        // CREATE THE IFRAME OUTPUT HERE

        echo "HELLO FROM THE IFRAME<br/>" . PHP_EOL;

        var_dump($_SESSION);



        // CLEAR THE TIMESTAMP

        unset($_SESSION["tm"]);

    }

    else

    {

        // CLEAR THE TIMESTAMP

        unset($_SESSION["tm"]);



        // GO BACK TO THE PARENT

        header("Location: /RAY_timestamp_handshake_parent.php");

        exit;

    }

}

// IF THE TIMESTAMP IS NOT FILLED IN

else

{

    // GO BACK TO THE PARENT

    header("Location: /RAY_timestamp_handshake_parent.php");

    exit;

}

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LVL 14

Expert Comment

by:ddsh79
Comment Utility
0
 
LVL 1

Author Comment

by:Steynsk
Comment Utility
@ Ray,

My question is about good old fesion frames not Iframes.  And sorry I don't want to write info to session variables. Can't this be done in plane javascript?

@ddsh79

That has nothing to do with getting the parent file name.
Sorry..
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LVL 1

Author Comment

by:Steynsk
Comment Utility
I more think in this direction:

if(parent.frames !=="parent.htm")
  parent.frames.location="parent.htm";

Sory my javascript knowlige is small
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LVL 14

Expert Comment

by:ddsh79
Comment Utility
it should be

if(parent.framename.location !=="parent.htm")
  parent.framename.location="parent.htm";

where framename is the name of the frame you are trying to access.
0
 
LVL 14

Expert Comment

by:ddsh79
Comment Utility
if you are trying to get the url of the page itself then you can use
window.location.href

this will give you the complete url as http://www.xyz.com/parent.html
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LVL 82

Accepted Solution

by:
leakim971 earned 500 total points
Comment Utility
You may use :


      var url = parent.location.href;
      var str = url.lastIndexOf("/") + 1;
      var pageName = url.substr(str);

      if(pageName.indexOf("parent.htm") == 0 ) {
            parent.framename.location="parent.htm"
      }
0
 
LVL 108

Expert Comment

by:Ray Paseur
Comment Utility
Well, stupid me.  I just took a long-shot guess that you might want a PHP solution since you posted the question in the PHP Zone.

Maybe these results will help:
http://lmgtfy.com?q=Learn+JavaScript

Over and out, ~Ray
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LVL 1

Author Closing Comment

by:Steynsk
Comment Utility
thanks
0
 
LVL 82

Expert Comment

by:leakim971
Comment Utility
You're welcome! Thanks for the points!
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