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CGI.pm: Can't modify non-lvalue subroutine call

by slugger415 (Monk)
on Mar 22, 2019 at 22:50 UTC ( [id://1231577]=perlquestion: print w/replies, xml ) Need Help??

slugger415 has asked for the wisdom of the Perl Monks concerning the following question:

Hello esteemed PerlMonks. I want to assign the value of one variable returned from a CGI.pm script, if it exists, to another, e.g.:

if($q->param('product_key_text')){ # if was entered in the text field,
                                    # set it to product_key
  $q->param('product_key')=$q->param('product_key_text');
 }

[download]

But I'm getting this error when text is entered in product_key_text:

Can't modify non-lvalue subrutine call

I gather I'm trying to modify a param that can't be modified; how do I do this? Thanks!

Replies are listed 'Best First'.
Re: CGI.pm: Can't modify non-lvalue subroutine call
by hippo (Bishop) on Mar 22, 2019 at 23:02 UTC

    The correct way to set the value of a parameter to that of another is this:

    $q->param (
    -name  => 'product_key',
    -value => $q->param('product_key_text')
);

    [download]
[reply]
[d/l]
      Perfect! thank you for the quick reply.
[reply]

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