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XML::LibXML problem...

by Sinister (Friar)
on Mar 08, 2002 at 13:35 UTC ( #150309=perlquestion: print w/replies, xml ) Need Help??
Sinister has asked for the wisdom of the Perl Monks concerning the following question:

Fellow monks,
I have a problem regarding XML::LibXML, another great API by Matts.

I have an xml document like this:
<?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE page SYSTEM "entities.dtd"> <form> <method>POST</method> <action>/cgi/process.cgi</action <input> <type>text</type> <name>name1</name> <required>0</required> <value></value> <comment>This field is not required.</comment> </input> <input> <type>text</type> <name>name3</name> <required>1</required> <value></value> <comment>Put three words here!</comment> <test> my @tmp = split(/\ /, shift()); return 1 if ( $#tmp == 2 ); return 0; </test> </input> </form>

The XML above creates a web form through the use of XSLT. The little bit of perl-code is stuffed through ev'l into a closure and the value of the CGI::param("name3") is put into that routine. If 0 returns we show the form again, if 1 returns we continue.

To be nice and informatife, I'd like to tell the user he/she is a stupid user. But I also like to store into my DOM the values to user already submitted. And I want to add another branch to the <form> trunk, holding information on why they failed.

I've tried _a lot_ in adding childs, nodes, childnodes, textchilds, you name it, but I just can't seem to get it done propperly.

I now have a hack, where I do:
$string = $dom->toString; $string =~ s/<\/form>//gim; $string .= "<info><failure>blah</failure></info>\n</form>\n"; $dom = $parser->parse_string($string);
This cannot be the purpose of libXML, and it surely is pretty expensive....

Er formait hyarya.
"Field experience is something you don't get until just after you need it."

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Re: XML::LibXML problem...
by lestrrat (Deacon) on Mar 08, 2002 at 20:05 UTC

    This seems to work for me:

    use strict; use XML::LibXML; my $xml =<<'EOM'; <?xml version="1.0" encoding="ISO-8859-1" ?> <form> <method>POST</method> <action>/cgi/process.cgi</action> <input> <type>text</type> <name>name1</name> <required>0</required> <value></value> <comment>This field is not required.</comment> </input> <input> <type>text</type> <name>name3</name> <required>1</required> <value></value> <comment>Put three words here!</comment> <test> my @tmp = split(/\ /, shift()); return 1 if ( $#tmp == 2 ); return 0; </test> </input> </form> EOM my $parser = XML::LibXML->new(); my $dom = $parser->parse_string( $xml ); my $info = $dom->createElement( 'info' ); my $failure = $dom->createElement( 'failure' ); my $reason = $dom->createTextNode( 'blah' ); $failure->appendChild( $reason ); $info->appendChild( $failure ); my $form = $dom->getDocumentElement; $form->appendChild( $info ); print $dom->toString;

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