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<title>Utilities | Jinja Documentation</title>
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<div id="navigation">
<h3>Documentation</h3>
<ul>
<li><a href="index.html">back to index</a></li>
<li><a href="http://wsgiarea.pocoo.org/repos/jinja/trunk/docs/source/utils.txt">view source online</a></li>
</ul>
<h3>Table of Contents</h3>
<ul>
<li><a href="#capture-output">Capture Output</a></li>
<li><a href="#modify-set-variables">Modify / Set Variables</a></li>
</ul>
</div>
<h1>Utilities</h1>
<div id="page">
<p>Jinja comes with some utility tags shipped. Those arn't necessary but can help
you with your templates.</p>
<div class="section">
<h2><a id="capture-output" name="capture-output">Capture Output</a></h2>
<p>Captures output and stores it in a variable:</p>
<pre class="literal-block">
{% capture as loopdata %}
{% for item in navigation %}
<li><a href="{{ item.href }}">{{ item.caption|escapexml }}</a></li>
{% endfor %}
{% endcapture %}
</pre>
<p>The output of the for loop is now stored in the variable <tt class="docutils literal"><span class="pre">loopdata</span></tt>.</p>
<p>This allows the double usage of block tags:</p>
<pre class="literal-block">
{% capture as title %}{% marker "title" %}{% endcapture %}
<html>
<head>
<title>{{ title|escapexml }} | My Webpage</title>
</head>
<body>
<h1>{{ title }}</h1>
{% marker "body" %}
</body>
</html>
</pre>
</div>
<div class="section">
<h2><a id="modify-set-variables" name="modify-set-variables">Modify / Set Variables</a></h2>
<p><tt class="docutils literal"><span class="pre">{%</span> <span class="pre">define</span> <span class="pre">%}</span></tt> allows you to set a variable.</p>
<p>Usage:</p>
<pre class="literal-block">
{% define my_variable "Some Value" %}
</pre>
<p>You can also apply filters:</p>
<pre class="literal-block">
{% define escaped content | escapexml %}
</pre>
</div>
</div>
</body>
</html>
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