NYCPHP Meetup

[Freedman, Tom S.]

I can't improve on Phil's solution options, but I did want to comment that
the JavaScript history object is locked for security reasons... imagine if
any site you visited could see everywhere you've been on the web since you
started up your browser, and log that information.  It would be a huge
privacy breech.  So they locked it up, and will let you move the user
forwards and back, but not actually see where they've been.  As they say,
it's not a bug, it's a feature! :-)
 
-Tom

-----Original Message-----
From: Phil Powell [mailto:soazine at erols.com]
Sent: Monday, July 14, 2003 4:49 PM
To: NYPHP Talk
Subject: Re: [nycphp-talk] $_SERVER['REQUEST_METHOD'] and Javascript
historyobject


Will the previous page have any form elements? If so, within a form within
pageA.php you can have this:
 
<input type=hidden name=refURL value=<?= $PHP_SELF ?>>
 
Calling this form variable in pageB.php would ensure that they came from
pageA.php
 
You can also do this in a query string, however, a better solution would be
some kind of unique key, such as
 
pageB.php?var1=blah&var2=foo&...&uniqueKey=ICameFromPageA.php&...
 
That way you look for some unique string that could only have come from
pageA.php.
 
HTH
 
Phil

----- Original Message ----- 
From: betenoir at echonyc.com <mailto:betenoir at echonyc.com>  
To: itp-alumni at forums.nyu.edu <mailto:itp-alumni at forums.nyu.edu>  ;
talk at lists.nyphp.org <mailto:talk at lists.nyphp.org>  
Sent: Monday, July 14, 2003 4:45 PM
Subject: [nycphp-talk] $_SERVER['REQUEST_METHOD'] and Javascript
historyobject

I'm trying to determine whether the user is coming to a given page (call it
pageB.php) from the previous page in the sequence (pageA.php) or off-site. 

While I can access window.history.length, i cannot access a given key in
that array:

"Error: uncaught exception: Permission denied to get property
History.previous" 

or 

"Error: uncaught exception: Permission denied to call method History.item"

FWIW I'm using php and while I can determine the $_SERVER['REQUEST_METHOD']
this technique is not infallible. Apparently when you hit "back" (or select
from the "Go" menu) some browsers use the cached version of page -- which
means they return pageA.php and not pageX.html

Aaaaarrrrgggghhhh!!!!!

Suggestions?

Clyde 



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