NAME¶
Template::Plugin::Cycle - Cyclically insert into a Template from a sequence of
values
SYNOPSIS¶
[% USE cycle('row', 'altrow') %]
<table border="1">
<tr class="[% class %]">
<td>First row</td>
</tr>
<tr class="[% class %]">
<td>Second row</td>
</tr>
<tr class="[% class %]">
<td>Third row</td>
</tr>
</table>
###################################################################
# Alternatively, you might want to make it available to all templates
# throughout an entire application.
use Template::Plugin::Cycle;
# Create a Cycle object and set some values
my $Cycle = Template::Plugin::Cycle->new;
$Cycle->init('normalrow', 'alternaterow');
# Bind the Cycle object into the Template
$Template->process( 'tablepage.html', class => $Cycle );
#######################################################
# Later that night in a Template
<table border="1">
<tr class="[% class %]">
<td>First row</td>
</tr>
<tr class="[% class %]">
<td>Second row</td>
</tr>
<tr class="[% class %]">
<td>Third row</td>
</tr>
</table>
[% class.reset %]
<table border="1">
<tr class="[% class %]">
<td>Another first row</td>
</tr>
</table>
#######################################################
# Which of course produces
<table border="1">
<tr class="normalrow">
<td>First row</td>
</tr>
<tr class="alternaterow">
<td>Second row</td>
</tr>
<tr class="normalrow">
<td>Third row</td>
</tr>
</table>
<table border="1">
<tr class="normalrow">
<td>Another first row</td>
</tr>
</table>
DESCRIPTION¶
Sometimes, apparently almost exclusively when doing alternating table row
backgrounds, you need to print an alternating, cycling, set of values into a
template.
Template::Plugin::Cycle is a small, simple, and hopefully DWIM solution to these
sorts of tasks.
It can be used either as a normal Template::Plugin, or can be created directly
and passed in as a template argument, so that you can set up situations where
it is implicitly available in every page.
METHODS¶
new [ $Context ] [, @list ]¶
The "new" constructor creates and returns a new
"Template::Plugin::Cycle" object. It can be optionally passed an
initial set of values to cycle through.
When called from within a Template, the new constructor will be passed the
current Template::Context as the first argument. This will be ignored.
By doing this, you can use it both directly, AND from inside a Template.
init @list¶
If you need to set the values for a new empty object, of change the values to
cycle through for an existing object, they can be passed to the
"init" method.
The method always returns the '' null string, to avoid inserting anything into
the template.
elements¶
The "elements" method returns the number of items currently set for
the "Template::Plugin::Cycle" object.
list¶
The "list" method returns the current list of values for the
"Template::Plugin::Cycle" object.
This is also the prefered method for getting access to a value at a particular
position within the list of items being cycled to.
[%# Access a variety of things from the list %]
The first item in the Cycle object is [% cycle.list.first %].
The second item in the Cycle object is [% cycle.list.[1] %].
The last item in the Cycle object is [% cycle.list.last %].
next¶
The "next" method returns the next value from the Cycle. If the end of
the list of valuese is reached, it will "cycle" back the first
object again.
This method is also the one called when the object is stringified. That is, when
it appears on its own in a template. Thus, you can do something like the
following.
<!-- An example of alternate row classes in a table-->
<table border="1">
<!-- Explicitly access the next class in the cycle -->
<tr class="[% rowclass.next %]">
<td>First row</td>
</tr>
<!-- This has the same effect -->
<tr class="[% rowclass %]">
<td>Second row</td>
</tr>
</table>
value¶
The "value" method is an analogy for the "next" method.
reset¶
If a single "Template::Plugin::Cycle" object is to be used it multiple
places within a template, and it is important that the same value be first
every time, then the "reset" method can be used.
The "reset" method resets the Cycle, so that the next value returned
will be the first value in the Cycle object.
SUPPORT¶
Bugs should be submitted via the CPAN bug tracker, located at
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Template-Plugin-Cycle
<
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Template-Plugin-Cycle>
For other issues, or commercial enhancement or support, contact the author..
AUTHOR¶
Adam Kennedy <adamk@cpan.org>
Thank you to Phase N Australia (
http://phase-n.com/ <
http://phase-n.com/>)
for permitting the open sourcing and release of this distribution as a
spin-off from a commercial project.
COPYRIGHT¶
Copyright 2004 - 2008 Adam Kennedy.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included with this
module.