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<div class="section" id="extends">
<h1><code class="docutils literal"><span class="pre">extends</span></code><a class="headerlink" href="#extends" title="Permalink to this headline">¶</a></h1>
<p>The <code class="docutils literal"><span class="pre">extends</span></code> tag can be used to extend a template from another one.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Like PHP, Twig does not support multiple inheritance. So you can only have
one extends tag called per rendering. However, Twig supports horizontal
<a class="reference internal" href="use.html"><span class="doc">reuse</span></a>.</p>
</div>
<p>Let’s define a base template, <code class="docutils literal"><span class="pre">base.html</span></code>, which defines a simple HTML
skeleton document:</p>
<div class="highlight-html+jinja"><div class="highlight"><pre><span></span><span class="cp"><!DOCTYPE html></span>
<span class="p"><</span><span class="nt">html</span><span class="p">></span>
<span class="p"><</span><span class="nt">head</span><span class="p">></span>
<span class="cp">{%</span> <span class="k">block</span> <span class="nv">head</span> <span class="cp">%}</span>
<span class="p"><</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">"stylesheet"</span> <span class="na">href</span><span class="o">=</span><span class="s">"style.css"</span> <span class="p">/></span>
<span class="p"><</span><span class="nt">title</span><span class="p">></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">title</span> <span class="cp">%}{%</span> <span class="k">endblock</span> <span class="cp">%}</span> - My Webpage<span class="p"></</span><span class="nt">title</span><span class="p">></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span>
<span class="p"></</span><span class="nt">head</span><span class="p">></span>
<span class="p"><</span><span class="nt">body</span><span class="p">></span>
<span class="p"><</span><span class="nt">div</span> <span class="na">id</span><span class="o">=</span><span class="s">"content"</span><span class="p">></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">content</span> <span class="cp">%}{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="p"></</span><span class="nt">div</span><span class="p">></span>
<span class="p"><</span><span class="nt">div</span> <span class="na">id</span><span class="o">=</span><span class="s">"footer"</span><span class="p">></span>
<span class="cp">{%</span> <span class="k">block</span> <span class="nv">footer</span> <span class="cp">%}</span>
<span class="ni">&copy;</span> Copyright 2011 by <span class="p"><</span><span class="nt">a</span> <span class="na">href</span><span class="o">=</span><span class="s">"http://domain.invalid/"</span><span class="p">></span>you<span class="p"></</span><span class="nt">a</span><span class="p">></span>.
<span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span>
<span class="p"></</span><span class="nt">div</span><span class="p">></span>
<span class="p"></</span><span class="nt">body</span><span class="p">></span>
<span class="p"></</span><span class="nt">html</span><span class="p">></span>
</pre></div>
</div>
<p>In this example, the <a class="reference internal" href="block.html"><span class="doc">block</span></a> tags define four blocks that child
templates can fill in.</p>
<p>All the <code class="docutils literal"><span class="pre">block</span></code> tag does is to tell the template engine that a child
template may override those portions of the template.</p>
<div class="section" id="child-template">
<h2>Child Template<a class="headerlink" href="#child-template" title="Permalink to this headline">¶</a></h2>
<p>A child template might look like this:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">extends</span> <span class="s2">"base.html"</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">block</span> <span class="nv">title</span> <span class="cp">%}</span><span class="x">Index</span><span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">block</span> <span class="nv">head</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{{</span> <span class="nv">parent</span><span class="o">()</span> <span class="cp">}}</span><span class="x"></span>
<span class="x"> <style type="text/css"></span>
<span class="x"> .important { color: #336699; }</span>
<span class="x"> </style></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">block</span> <span class="nv">content</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> <h1>Index</h1></span>
<span class="x"> <p class="important"></span>
<span class="x"> Welcome on my awesome homepage.</span>
<span class="x"> </p></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>The <code class="docutils literal"><span class="pre">extends</span></code> tag is the key here. It tells the template engine that this
template “extends” another template. When the template system evaluates this
template, first it locates the parent. The extends tag should be the first tag
in the template.</p>
<p>Note that since the child template doesn’t define the <code class="docutils literal"><span class="pre">footer</span></code> block, the
value from the parent template is used instead.</p>
<p>You can’t define multiple <code class="docutils literal"><span class="pre">block</span></code> tags with the same name in the same
template. This limitation exists because a block tag works in “both”
directions. That is, a block tag doesn’t just provide a hole to fill - it also
defines the content that fills the hole in the <em>parent</em>. If there were two
similarly-named <code class="docutils literal"><span class="pre">block</span></code> tags in a template, that template’s parent wouldn’t
know which one of the blocks’ content to use.</p>
<p>If you want to print a block multiple times you can however use the
<code class="docutils literal"><span class="pre">block</span></code> function:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="x"><title></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">title</span> <span class="cp">%}{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></title></span>
<span class="x"><h1></span><span class="cp">{{</span> <span class="nb">block</span><span class="o">(</span><span class="s1">'title'</span><span class="o">)</span> <span class="cp">}}</span><span class="x"></h1></span>
<span class="cp">{%</span> <span class="k">block</span> <span class="nv">body</span> <span class="cp">%}{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
</div>
<div class="section" id="parent-blocks">
<h2>Parent Blocks<a class="headerlink" href="#parent-blocks" title="Permalink to this headline">¶</a></h2>
<p>It’s possible to render the contents of the parent block by using the
<a class="reference internal" href="../functions/parent.html"><span class="doc">parent</span></a> function. This gives back the results of
the parent block:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">sidebar</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> <h3>Table Of Contents</h3></span>
<span class="x"> ...</span>
<span class="x"> </span><span class="cp">{{</span> <span class="nv">parent</span><span class="o">()</span> <span class="cp">}}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
</div>
<div class="section" id="named-block-end-tags">
<h2>Named Block End-Tags<a class="headerlink" href="#named-block-end-tags" title="Permalink to this headline">¶</a></h2>
<p>Twig allows you to put the name of the block after the end tag for better
readability:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">sidebar</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">inner_sidebar</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> ...</span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">endblock</span> <span class="nv">inner_sidebar</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="nv">sidebar</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>Of course, the name after the <code class="docutils literal"><span class="pre">endblock</span></code> word must match the block name.</p>
</div>
<div class="section" id="block-nesting-and-scope">
<h2>Block Nesting and Scope<a class="headerlink" href="#block-nesting-and-scope" title="Permalink to this headline">¶</a></h2>
<p>Blocks can be nested for more complex layouts. Per default, blocks have access
to variables from outer scopes:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">for</span> <span class="nv">item</span> <span class="k">in</span> <span class="nv">seq</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> <li></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">loop_item</span> <span class="cp">%}{{</span> <span class="nv">item</span> <span class="cp">}}{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></li></span>
<span class="cp">{%</span> <span class="k">endfor</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
</div>
<div class="section" id="block-shortcuts">
<h2>Block Shortcuts<a class="headerlink" href="#block-shortcuts" title="Permalink to this headline">¶</a></h2>
<p>For blocks with little content, it’s possible to use a shortcut syntax. The
following constructs do the same thing:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">title</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{{</span> <span class="nv">page_title</span><span class="o">|</span><span class="nf">title</span> <span class="cp">}}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">title</span> <span class="nv">page_title</span><span class="o">|</span><span class="nf">title</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
</div>
<div class="section" id="dynamic-inheritance">
<h2>Dynamic Inheritance<a class="headerlink" href="#dynamic-inheritance" title="Permalink to this headline">¶</a></h2>
<p>Twig supports dynamic inheritance by using a variable as the base template:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">extends</span> <span class="nv">some_var</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>If the variable evaluates to a <code class="docutils literal"><span class="pre">Twig_Template</span></code> or a <code class="docutils literal"><span class="pre">Twig_TemplateWrapper</span></code>
instance, Twig will use it as the parent template:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span>// {% extends layout %}
$layout = $twig->load('some_layout_template.twig');
$twig->display('template.twig', array('layout' => $layout));
</pre></div>
</div>
<p>You can also provide a list of templates that are checked for existence. The
first template that exists will be used as a parent:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">extends</span> <span class="o">[</span><span class="s1">'layout.html'</span><span class="o">,</span> <span class="s1">'base_layout.html'</span><span class="o">]</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
</div>
<div class="section" id="conditional-inheritance">
<h2>Conditional Inheritance<a class="headerlink" href="#conditional-inheritance" title="Permalink to this headline">¶</a></h2>
<p>As the template name for the parent can be any valid Twig expression, it’s
possible to make the inheritance mechanism conditional:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">extends</span> <span class="nv">standalone</span> <span class="p">?</span> <span class="s2">"minimum.html"</span> <span class="o">:</span> <span class="s2">"base.html"</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>In this example, the template will extend the “minimum.html” layout template
if the <code class="docutils literal"><span class="pre">standalone</span></code> variable evaluates to <code class="docutils literal"><span class="pre">true</span></code>, and “base.html”
otherwise.</p>
</div>
<div class="section" id="how-do-blocks-work">
<h2>How do blocks work?<a class="headerlink" href="#how-do-blocks-work" title="Permalink to this headline">¶</a></h2>
<p>A block provides a way to change how a certain part of a template is rendered
but it does not interfere in any way with the logic around it.</p>
<p>Let’s take the following example to illustrate how a block works and more
importantly, how it does not work:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="c">{# base.twig #}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">for</span> <span class="nv">post</span> <span class="k">in</span> <span class="nv">posts</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">post</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> <h1></span><span class="cp">{{</span> <span class="nv">post.title</span> <span class="cp">}}</span><span class="x"></h1></span>
<span class="x"> <p></span><span class="cp">{{</span> <span class="nv">post.body</span> <span class="cp">}}</span><span class="x"></p></span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">endfor</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>If you render this template, the result would be exactly the same with or
without the <code class="docutils literal"><span class="pre">block</span></code> tag. The <code class="docutils literal"><span class="pre">block</span></code> inside the <code class="docutils literal"><span class="pre">for</span></code> loop is just a way
to make it overridable by a child template:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="c">{# child.twig #}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">extends</span> <span class="s2">"base.twig"</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">block</span> <span class="nv">post</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> <article></span>
<span class="x"> <header></span><span class="cp">{{</span> <span class="nv">post.title</span> <span class="cp">}}</span><span class="x"></header></span>
<span class="x"> <section></span><span class="cp">{{</span> <span class="nv">post.text</span> <span class="cp">}}</span><span class="x"></section></span>
<span class="x"> </article></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>Now, when rendering the child template, the loop is going to use the block
defined in the child template instead of the one defined in the base one; the
executed template is then equivalent to the following one:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">for</span> <span class="nv">post</span> <span class="k">in</span> <span class="nv">posts</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> <article></span>
<span class="x"> <header></span><span class="cp">{{</span> <span class="nv">post.title</span> <span class="cp">}}</span><span class="x"></header></span>
<span class="x"> <section></span><span class="cp">{{</span> <span class="nv">post.text</span> <span class="cp">}}</span><span class="x"></section></span>
<span class="x"> </article></span>
<span class="cp">{%</span> <span class="k">endfor</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>Let’s take another example: a block included within an <code class="docutils literal"><span class="pre">if</span></code> statement:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">if</span> <span class="nv">posts</span> <span class="k">is</span> <span class="nf">empty</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">head</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{{</span> <span class="nv">parent</span><span class="o">()</span> <span class="cp">}}</span><span class="x"></span>
<span class="x"> <meta name="robots" content="noindex, follow"></span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">endblock</span> <span class="nv">head</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">endif</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<p>Contrary to what you might think, this template does not define a block
conditionally; it just makes overridable by a child template the output of
what will be rendered when the condition is <code class="docutils literal"><span class="pre">true</span></code>.</p>
<p>If you want the output to be displayed conditionally, use the following
instead:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">block</span> <span class="nv">head</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{{</span> <span class="nv">parent</span><span class="o">()</span> <span class="cp">}}</span><span class="x"></span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">if</span> <span class="nv">posts</span> <span class="k">is</span> <span class="nf">empty</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> <meta name="robots" content="noindex, follow"></span>
<span class="x"> </span><span class="cp">{%</span> <span class="k">endif</span> <span class="cp">%}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">endblock</span> <span class="nv">head</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
</div>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="../functions/block.html"><span class="doc">block</span></a>, <a class="reference internal" href="block.html"><span class="doc">block</span></a>, <a class="reference internal" href="../functions/parent.html"><span class="doc">parent</span></a>, <a class="reference internal" href="use.html"><span class="doc">use</span></a></p>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
<div class="sphinxsidebarwrapper">
<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#"><code class="docutils literal"><span class="pre">extends</span></code></a><ul>
<li><a class="reference internal" href="#child-template">Child Template</a></li>
<li><a class="reference internal" href="#parent-blocks">Parent Blocks</a></li>
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