Re^2: WWW::Mechanize::TreeBuilder and WWW::Mechanize. Following links but can't return without error

in reply to Re: WWW::Mechanize::TreeBuilder and WWW::Mechanize. Following links but can't return without error
in thread WWW::Mechanize::TreeBuilder and WWW::Mechanize. Following links but can't return without error

Oh sorry, here is the full code (I thought a snippet would be more clear in that case). This is everything from the folder, the 4 html pages and the perl code.

mech.pl

#!/usr/bin/perl
use strict;
use warnings;

use WWW::Mechanize;
use WWW::Mechanize::TreeBuilder;

my $mech = WWW::Mechanize->new();
WWW::Mechanize::TreeBuilder->meta->apply($mech);

$mech->get('file:///home/example/path/index.html');
die "Cannot open file: ", $mech->response->status_line
    unless $mech->success;

my @list = $mech->look_down(_tag => "a", class => "links);
foreach (@list) {

    my $url = "file:///home/example/path/";
    $url = $url . $_->attr("href");

    print $_->as_text(), " - ", $url, "\n";

    $mech->get($url);
    $mech->back();
}
[download]

index.html

<html>
<head>
<title>Web Scraper Testing Grounds</title>

<style>
.links { font-family: Sans-Serif; }
.spans { font-family: Serif; }
.trs { border: 1px solid; }
</style>

</head>


<body>

<h1>Test Page for WWW::Mechanize scraping</h1>

<table>
<tr class="trs">
  <td><a href="s1.html" class="links">S1 Link Content</a></td>
  <td><span class="spans">Page S1</span></td>
</tr>

<tr class="trs">
  <td><a href="s2.html" class="links">S2 Link Content</a></td>
  <td><span class="spans">Page S2</span></td>
</tr>

<tr class="trs">
  <td><a href="s3.html" class="links">S3 Link Content</a></td>
  <td><span class="spans">Page S3</td>
</tr>

</table>

</body>
</html>
[download]

s1.html

<html>
<head></head>

<body>

<h1>This is the S1 page, first in set</h1>

</body>
</html>
[download]

s2.html

<html>
<head></head>

<body>

<h1>This is the S2 page, second in set</h1>

</body>
</html>
[download]

s3.html

<html>
<head></head>

<body>

<h1>This is the S3 page, third and final</h1>

</body>
</html>
[download]

When I try and run the code, this is the output I get

mdro79@mycpu$ ./mech.pl
S1 Link Content - file:///home/example/path/s1.html
Use of uninitialized value in concatenation (.) or string at ./scrMe.p
+l line 31.
Use of uninitialized value $tag in string eq at /usr/local/share/perl/
+5.14.2/HTML/Element.pm line 1109.
Use of uninitialized value $tag in string eq at /usr/local/share/perl/
+5.14.2/HTML/Element.pm line 1109.
 - file:///home/example/path/
Use of uninitialized value in concatenation (.) or string at ./scrMe.p
+l line 31.
Use of uninitialized value $tag in string eq at /usr/local/share/perl/
+5.14.2/HTML/Element.pm line 1109.
Use of uninitialized value $tag in string eq at /usr/local/share/perl/
+5.14.2/HTML/Element.pm line 1109.
 - file:///home/example/path/
[download]

Comment on Re^2: WWW::Mechanize::TreeBuilder and WWW::Mechanize. Following links but can't return without error Select or Download Code

Replies are listed 'Best First'.
Re^3: WWW::Mechanize::TreeBuilder and WWW::Mechanize. Following links but can't return without error by choroba (Cardinal) on Jan 05, 2013 at 07:32 UTC
You do not have to go `back` if you are not `follow`ing the links. Also, if `$url` is static, you can declare it just once before entering the loop. لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^3: WWW::Mechanize::TreeBuilder and WWW::Mechanize. Following links but can't return without error by Anonymous Monk on Jan 05, 2013 at 00:55 UTC
Whoa, well that is the trouble with trees and trying to save memory :) you can work around it like this `@list = map { $_->clone } @list;` [download] or `my @list = map { $_->clone } $mech->look_down(_tag => "a", class => "l +inks" );` [download]	[reply] [d/l] [select]

In Section Seekers of Perl Wisdom