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passing a variable from PERL into an HTML form

Posted by forrestcook (forrestcook), 4 October 2006
Here's my deal:

I've got a guestbook program up and running (mostly) that requires for part of it's operation that a text field that was initially entered into an HTML form be passed through my CGI script and back into a hidden text field generated by the same CGI script. It's working fine until someone uses a double quote in the first text box and then it acts up. I could solve it by filtering out the double quotes (tr/"/'/ but then I'd be changing what they wrote, and with nested quotes in some paragraphs that would be unfavorable.

here's what I have as far as code snippets so far:
read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
     ($name, $value) = split(/=/, $pair);
     $value =~ tr/+/ /;
     $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
     $value =~ s/<!--(.|\n)*-->//g;
     $value =~ s/<([^>]|\n)*>//g;
     #$value =~ tr/"/'/;
     $INPUT{$name} = $value;

That's my header complete with commented out quote filter.

<input type="hidden" name="message" value="$INPUT{'message'} "><br />\n

and that is where it prints into the hidden text field... any ideas? Need more info? I'll b checking back frequently...

Forrest Cook

Posted by admin (Graham Ellis), 5 October 2006

$input{message} =~ s/"/&quot;/g;

It looks like your problem is a double quote within the double quoted string in the HTML. Replace the double quotes with the &quot; code and it should be fine.

Posted by forrestcook (forrestcook), 5 October 2006
wow.... I was trying to solve it in a much more complicated way. Thanks for the obvious answer that I would never have thought of!

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