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Full Discussion: Perl substr or similar help
Top Forums Shell Programming and Scripting Perl substr or similar help Post 303025177 by Neo on Friday 26th of October 2018 03:07:31 AM
Old 10-26-2018
This is not how web developers process the DOM in HTML, especially on the client side.

Should I assume you are processing the value on the server side?

Either way, your post confused me. On the client side , we easily get the value attribute of the input DOM element with Javacript:

Code:
var value = document.getElementsByTagName("input")[0].getAttribute("value");

If on the server side, normally you use PHP or PERL and you get the attribute value when you submit on the browser to the server.

PHP Example:

Code:
$value = $_GET['value'];

or

Code:
$value = $_POST['value']

We web developers do not process HTML files as big strings and use PERL or PHP or any language to extract a value; because this is easily done on both the client or server side with existing built-in methods.

Getting the value of an HTML DOM attribute does not require a script like you have written. Hidden values are normally submitted with HTML forms via the $_POST method.

This means on the server side, you would simple read the value of $_POST['value'] when the DOM element is submitted.
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LEARN ABOUT DEBIAN

html::html5::sanity

HTML::HTML5::Sanity(3pm)				User Contributed Perl Documentation				  HTML::HTML5::Sanity(3pm)

NAME

       HTML::HTML5::Sanity - make HTML5 DOM trees less insane

SYNOPSIS

	 use HTML::HTML5::Parser;
	 use HTML::HTML5::Sanity;

	 my $parser    = HTML::HTML5::Parser->new;
	 my $html5_dom = $parser->parse_file('http://example.com/');
	 my $sane_dom  = fix_document($html5_dom);

DESCRIPTION

       The Document Object Model (DOM) generated by HTML::HTML5::Parser meets the requirements of the HTML5 spec, but will probably catch a lot of
       people by surprise.

       The main oddity is that elements and attributes which appear to be namespaced are not really. For example, the following element:

	 <div xml:lang="fr">...</div>

       Looks like it should be parsed so that it has an attribute "lang" in the XML namespace. Not so. It will really be parsed as having the
       attribute "xml:lang" in the null namespace.

       "fix_document($document)"
	     $sane_dom = fix_document($html5_dom);

	   Returns a modified copy of the DOM and leaving the original DOM unmodified.

       "fix_element($element_node, $new_document_node, \%namespaces)"
	   Don't use this. Not exported.

       "fix_attribute($attribute_node, $new_element_node, \%namespaces)"
	   Don't use this. Not exported.

       $HTML::HTML5::Sanity::FIX_LANG_ATTRIBUTES
	     $HTML::HTML5::Sanity::FIX_LANG_ATTRIBUTES = 2;
	     $sane_dom = fix_document($html5_dom);

	   If set to 1 (the default), the package will detect invalid values in @lang and @xml:lang, and remove the attribute if it is invalid. If
	   set to 2, it will also attempt to canonicalise the value (e.g. 'EN_GB' will be converted to to 'en-GB'). If set to 0, then the value of
	   language attributes is not checked.

BUGS

       Please report any bugs to <http://rt.cpan.org/>.

SEE ALSO

       HTML::HTML5::Parser, XML::LibXML, Task::HTML5.

AUTHOR

       Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENSE

       Copyright (C) 2009-2011 by Toby Inkster

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2011-12-08						  HTML::HTML5::Sanity(3pm)
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