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<h1 class="headline">Template::Plugin::URL</h1>
<h2 class="subhead">Plugin to construct complex URLs</h1>
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<pre><span class="tt">[% USE url('/cgi-bin/foo.pl') %]</span>
<span class="tt">[% url(debug = 1, id = 123) %]</span>
# ==> /cgi/bin/foo.pl?debug=1&amp;id=123
<span class="tt">[% USE mycgi = url('/cgi-bin/bar.pl', mode='browse', debug=1) %]</span>
<span class="tt">[% mycgi %]</span>
# ==> /cgi/bin/bar.pl?mode=browse&amp;debug=1
<span class="tt">[% mycgi(mode='submit') %]</span>
# ==> /cgi/bin/bar.pl?mode=submit&amp;debug=1
<span class="tt">[% mycgi(debug='d2 p0', id='D4-2k[4]') %]</span>
# ==> /cgi-bin/bar.pl?mode=browse&amp;debug=d2%20p0&amp;id=D4-2k%5B4%5D</pre>
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<p>
The <code>URL</code> plugin can be used to construct complex URLs from a
base stem and a hash array of additional query parameters.
</p>
<p>
The constructor should be passed a base URL and optionally, a hash array
reference of default parameters and values. Used from with a template, it
would look something like the following:
</p>
<pre><span class="tt">[% USE url('http://www.somewhere.com/cgi-bin/foo.pl') %]</span>
<span class="tt">[% USE url('/cgi-bin/bar.pl', mode='browse') %]</span>
<span class="tt">[% USE url('/cgi-bin/baz.pl', mode='browse', debug=1) %]</span></pre>
<p>
When the plugin is then called without any arguments, the default base
and parameters are returned as a formatted query string.
</p>
<pre><span class="tt">[% url %]</span></pre>
<p>
For the above three examples, these will produce the following outputs:
</p>
<pre>http://www.somewhere.com/cgi-bin/foo.pl
/cgi-bin/bar.pl?mode=browse
/cgi-bin/baz.pl?mode=browse&amp;debug=1</pre>
<p>
Note that additional parameters are separated by '<code>&amp;</code>'
rather than simply '<code>&</code>'. This is the correct behaviour
for HTML pages but is, unfortunately, incorrect when creating URLs that
do not need to be encoded safely for HTML. This is likely to be corrected
in a future version of the plugin (most probably with TT3). In the mean
time, you can set <code>$Template::Plugin::URL::JOINT</code> to
<code>&</code> to get the correct behaviour.
</p>
<p>
Additional parameters may be also be specified to the URL:
</p>
<pre><span class="tt">[% url(mode='submit', id='wiz') %]</span></pre>
<p>
Which, for the same three examples, produces:
</p>
<pre>http://www.somewhere.com/cgi-bin/foo.pl?mode=submit&amp;id=wiz
/cgi-bin/bar.pl?mode=browse&amp;id=wiz
/cgi-bin/baz.pl?mode=browse&amp;debug=1&amp;id=wiz</pre>
<p>
A new base URL may also be specified as the first option:
</p>
<pre><span class="tt">[% url('/cgi-bin/waz.pl', test=1) %]</span></pre>
<p>
producing
</p>
<pre>/cgi-bin/waz.pl?test=1
/cgi-bin/waz.pl?mode=browse&amp;test=1
/cgi-bin/waz.pl?mode=browse&amp;debug=1&amp;test=1</pre>
<p>
The ordering of the parameters is non-deterministic due to fact that
Perl's hashes themselves are unordered. This isn't a problem as the
ordering of CGI parameters is insignificant (to the best of my
knowledge). All values will be properly escaped thanks to some code
borrowed from Lincoln Stein's <code>CGI</code> module. e.g.
</p>
<pre><span class="tt">[% USE url('/cgi-bin/woz.pl') %]</span>
<span class="tt">[% url(name="Elrich von Benjy d'Weiro") %]</span></pre>
<p>
Here the spaces and "<code>'</code>" character are escaped in the output:
</p>
<pre>/cgi-bin/woz.pl?name=Elrich%20von%20Benjy%20d%27Weiro</pre>
<p>
An alternate name may be provided for the plugin at construction time as
per regular Template Toolkit syntax.
</p>
<pre><span class="tt">[% USE mycgi = url('cgi-bin/min.pl') %]</span>
<span class="tt">[% mycgi(debug=1) %]</span></pre>
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<p>
Andy Wardley <abw@wardley.org> <a
href="http://wardley.org/">http://wardley.org/</a>
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<p>
Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved.
</p>
<p>
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
</p>
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