mod_perl and JavaScript

[Kemin Zhou <ke...@ferring.com>]

This is almost certainly caused by a bug in your perl code.  You are
probably unintentionally creating a closure.  If you post some code
here, we can help you spot the problem.

- Perrin
Earlier I posted a problem with HPPTD and mod_perl.
Thanks for Perrin's respons.  

Now I have the problem solved.
The bug is the classical problem with named subroutin inside another subroutine.

This is one shortcoming of mod_perl.  PHP would not have such a problem.

I was using the CGI object as a global variable

my $q = new CGI

do something ....

my $request = $q->param('request');
if ($request eq 'updateTable') {
	updateDBTable();
}


sub updateDBTable {
	my $form_variable = $q->param('variable_name');
}

==
This code would have no problem at all if run as CGI script.
It it will be very bad under mod_perl.
So don't write this.  There are many solutions to this.

One of them is to pass $q as argument of the subroutine.  This is the one I used.

====
The problem looks as if a caching problem.  Because after the second run, the 
subroutine and the main program the $q-> will point to different forms.

Kemin




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Re: mod_perl and JavaScript

[Perrin Harkins <pe...@elem.com>]

On Thu, 2004-04-08 at 18:04, Kemin Zhou wrote:
> The bug is the classical problem with named subroutin inside another subroutine.
> 
> This is one shortcoming of mod_perl.  PHP would not have such a problem.

It doesn't actually have much to do with mod_perl.  It's just a coding
mistake, tripping over perl's scoping rules.  It's still a mistake when
writing for CGI, but you wouldn't see it because the interpreter exits
after every request.

PHP has unusual scoping rules.  In order to access a variable declared
in a higher scope in PHP, you have to make the variable global.  If you
were to use a global variable in perl, that would also avoid the closure
issue.

Glad to hear you fixed the problem.

- Perrin


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