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124 .\" ========================================================================
126 .IX Title "Template::Plugin::Cycle 3"
127 .TH Template::Plugin::Cycle 3 "2008-06-19" "perl v5.8.7" "User Contributed Perl Documentation"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 Template::Plugin::Cycle \- Cyclically insert into a Template from a sequence of values
135 .IX Header "SYNOPSIS"
137 \& [% USE cycle(\*(Aqrow\*(Aq, \*(Aqaltrow\*(Aq) %]
139 \& <table border="1">
140 \& <tr class="[% class %]">
141 \& <td>First row</td>
143 \& <tr class="[% class %]">
144 \& <td>Second row</td>
146 \& <tr class="[% class %]">
147 \& <td>Third row</td>
155 \& ###################################################################
156 \& # Alternatively, you might want to make it available to all templates
157 \& # throughout an entire application.
159 \& use Template::Plugin::Cycle;
161 \& # Create a Cycle object and set some values
162 \& my $Cycle = Template::Plugin::Cycle\->new;
163 \& $Cycle\->init(\*(Aqnormalrow\*(Aq, \*(Aqalternaterow\*(Aq);
165 \& # Bind the Cycle object into the Template
166 \& $Template\->process( \*(Aqtablepage.html\*(Aq, class => $Cycle );
172 \& #######################################################
173 \& # Later that night in a Template
175 \& <table border="1">
176 \& <tr class="[% class %]">
177 \& <td>First row</td>
179 \& <tr class="[% class %]">
180 \& <td>Second row</td>
182 \& <tr class="[% class %]">
183 \& <td>Third row</td>
188 \& <table border="1">
189 \& <tr class="[% class %]">
190 \& <td>Another first row</td>
198 \& #######################################################
199 \& # Which of course produces
201 \& <table border="1">
202 \& <tr class="normalrow">
203 \& <td>First row</td>
205 \& <tr class="alternaterow">
206 \& <td>Second row</td>
208 \& <tr class="normalrow">
209 \& <td>Third row</td>
213 \& <table border="1">
214 \& <tr class="normalrow">
215 \& <td>Another first row</td>
220 .IX Header "DESCRIPTION"
221 Sometimes, apparently almost exclusively when doing alternating table row
222 backgrounds, you need to print an alternating, cycling, set of values
225 Template::Plugin::Cycle is a small, simple, and hopefully \s-1DWIM\s0 solution to
226 these sorts of tasks.
228 It can be used either as a normal Template::Plugin, or can be created
229 directly and passed in as a template argument, so that you can set up
230 situations where it is implicitly available in every page.
233 .ie n .SS "new [ $Context ] [, @list ]"
234 .el .SS "new [ \f(CW$Context\fP ] [, \f(CW@list\fP ]"
235 .IX Subsection "new [ $Context ] [, @list ]"
236 The \f(CW\*(C`new\*(C'\fR constructor creates and returns a new \f(CW\*(C`Template::Plugin::Cycle\*(C'\fR
237 object. It can be optionally passed an initial set of values to cycle
240 When called from within a Template, the new constructor will be passed the
241 current Template::Context as the first argument. This will be ignored.
243 By doing this, you can use it both directly, \s-1AND\s0 from inside a Template.
244 .ie n .SS "init @list"
245 .el .SS "init \f(CW@list\fP"
246 .IX Subsection "init @list"
247 If you need to set the values for a new empty object, of change the values
248 to cycle through for an existing object, they can be passed to the \f(CW\*(C`init\*(C'\fR
251 The method always returns the \f(CW\*(Aq\*(Aq\fR null string, to avoid inserting
252 anything into the template.
254 .IX Subsection "elements"
255 The \f(CW\*(C`elements\*(C'\fR method returns the number of items currently set for the
256 \&\f(CW\*(C`Template::Plugin::Cycle\*(C'\fR object.
258 .IX Subsection "list"
259 The \f(CW\*(C`list\*(C'\fR method returns the current list of values for the
260 \&\f(CW\*(C`Template::Plugin::Cycle\*(C'\fR object.
262 This is also the prefered method for getting access to a value at a
263 particular position within the list of items being cycled to.
266 \& [%# Access a variety of things from the list %]
267 \& The first item in the Cycle object is [% cycle.list.first %].
268 \& The second item in the Cycle object is [% cycle.list.[1] %].
269 \& The last item in the Cycle object is [% cycle.list.last %].
272 .IX Subsection "next"
273 The \f(CW\*(C`next\*(C'\fR method returns the next value from the Cycle. If the end of
274 the list of valuese is reached, it will \*(L"cycle\*(R" back the first object again.
276 This method is also the one called when the object is stringified. That is,
277 when it appears on its own in a template. Thus, you can do something like
281 \& <!\-\- An example of alternate row classes in a table\-\->
282 \& <table border="1">
283 \& <!\-\- Explicitly access the next class in the cycle \-\->
284 \& <tr class="[% rowclass.next %]">
285 \& <td>First row</td>
287 \& <!\-\- This has the same effect \-\->
288 \& <tr class="[% rowclass %]">
289 \& <td>Second row</td>
294 .IX Subsection "value"
295 The \f(CW\*(C`value\*(C'\fR method is an analogy for the \f(CW\*(C`next\*(C'\fR method.
297 .IX Subsection "reset"
298 If a single \f(CW\*(C`Template::Plugin::Cycle\*(C'\fR object is to be used it multiple
299 places within a template, and it is important that the same value be first
300 every time, then the \f(CW\*(C`reset\*(C'\fR method can be used.
302 The \f(CW\*(C`reset\*(C'\fR method resets the Cycle, so that the next value returned will
303 be the first value in the Cycle object.
306 Bugs should be submitted via the \s-1CPAN\s0 bug tracker, located at
308 <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Template\-Plugin\-Cycle>
310 For other issues, or commercial enhancement or support, contact the author..
313 Adam Kennedy <adamk@cpan.org>
315 Thank you to Phase N Australia (<http://phase\-n.com/>) for permitting
316 the open sourcing and release of this distribution as a spin-off from a
319 .IX Header "COPYRIGHT"
320 Copyright 2004 \- 2008 Adam Kennedy.
322 This program is free software; you can redistribute
323 it and/or modify it under the same terms as Perl itself.
325 The full text of the license can be found in the
326 \&\s-1LICENSE\s0 file included with this module.