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smarty/docs/en/designers/language-builtin-functions/language-function-capture.xml
2005-05-27 16:25:02 +00:00

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<?xml version="1.0" encoding="iso-8859-1"?>
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<sect1 id="language.function.capture">
<title>{capture}</title>
<informaltable frame="all">
<tgroup cols="5">
<colspec colname="param" align="center" />
<colspec colname="type" align="center" />
<colspec colname="required" align="center" />
<colspec colname="default" align="center" />
<colspec colname="desc" />
<thead>
<row>
<entry>Attribute Name</entry>
<entry>Type</entry>
<entry>Required</entry>
<entry>Default</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>name</entry>
<entry>string</entry>
<entry>no</entry>
<entry><emphasis>default</emphasis></entry>
<entry>The name of the captured block</entry>
</row>
<row>
<entry>assign</entry>
<entry>string</entry>
<entry>No</entry>
<entry><emphasis>n/a</emphasis></entry>
<entry>The variable name where to assign the captured output to</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>
{capture} is used to collect the output of the template into a
variable instead of displaying it. Any content between {capture
name="foo"} and {/capture} is collected into the variable specified
in the name attribute. The captured content can be used in the
template from the special variable <link
linkend="language.variables.smarty.capture">$smarty.capture.foo</link>
where "foo" is the value passed in the name attribute. If you do not
supply a name attribute, then "default" will be used. All {capture}
commands must be paired with {/capture}. You can nest capture commands.
</para>
<note>
<title>Technical Note</title>
<para>
Smarty 1.4.0 - 1.4.4 placed the captured content into the
variable named $return. As of 1.4.5, this behavior was changed to use
the name attribute, so update your templates accordingly.
</para>
</note>
<caution>
<para>
Be careful when capturing <link
linkend="language.function.insert">{insert}</link>
output. If you have
<link linkend="caching">caching</link>
turned on and you have
<link linkend="language.function.insert">{insert}</link>
commands that you expect to run
within cached content, do not capture this content.
</para>
</caution>
<para>
<example>
<title>capturing template content</title>
<programlisting>
<![CDATA[
{* we don't want to print a table row unless content is displayed *}
{capture name=banner}
{include file="get_banner.tpl"}
{/capture}
{if $smarty.capture.banner ne ''}
<table>
<tr>
<td>
{$smarty.capture.banner}
</td>
</tr>
</table>
{/if}
]]>
</programlisting>
</example>
</para>
<para>
See also
<link
linkend="language.variables.smarty.capture">$smarty.capture</link>,
<link linkend="language.function.eval">{eval}</link>,
<link linkend="language.function.fetch">{fetch}</link>,
<link linkend="api.fetch">fetch()</link>
and <link linkend="language.function.assign">{assign}</link>.
</para>
</sect1>
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