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<section id="view-layouts">
<h1>View Layouts<a class="headerlink" href="#view-layouts" title="Permalink to this heading"></a></h1>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#creating-a-layout" id="id2">Creating A Layout</a></p></li>
<li><p><a class="reference internal" href="#using-layouts-in-views" id="id3">Using Layouts in Views</a></p></li>
<li><p><a class="reference internal" href="#rendering-the-view" id="id4">Rendering the View</a></p></li>
<li><p><a class="reference internal" href="#including-view-partials" id="id5">Including View Partials</a></p></li>
</ul>
</nav>
<p>CodeIgniter supports a simple, yet very flexible, layout system that makes it simple to use one or more
base page layouts across your application. Layouts support sections of content that can be inserted from
any view being rendered. You could create different layouts to support one-column, two-column,
blog archive pages, and more. Layouts are never directly rendered. Instead, you render a view, which
specifies the layout that it wants to extend.</p>
<section id="creating-a-layout">
<span id="id1"></span><h2><a class="toc-backref" href="#id2" role="doc-backlink">Creating A Layout</a><a class="headerlink" href="#creating-a-layout" title="Permalink to this heading"></a></h2>
<p>Layouts are views like any other. The only difference is their intended usage. Layouts are the only view
files that would make use of the <code class="docutils literal notranslate"><span class="pre">renderSection()</span></code> method. This method acts as a placeholder for content.</p>
<p>E.g. <strong>app/Views/default.php</strong>:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;!</span><span class="nx">doctype</span> <span class="nx">html</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">html</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">head</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">title</span><span class="o">&gt;</span><span class="nx">My</span> <span class="nx">Layout</span><span class="o">&lt;/</span><span class="nx">title</span><span class="o">&gt;</span>
<span class="o">&lt;/</span><span class="nx">head</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">body</span><span class="o">&gt;</span>
<span class="o">&lt;?=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">renderSection</span><span class="p">(</span><span class="s1">&#39;content&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="p">&lt;/</span><span class="nt">body</span><span class="p">&gt;</span>
<span class="p">&lt;/</span><span class="nt">html</span><span class="p">&gt;</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">renderSection()</span></code> method has two arguments: <code class="docutils literal notranslate"><span class="pre">$sectionName</span></code> and <code class="docutils literal notranslate"><span class="pre">$saveData</span></code>. <code class="docutils literal notranslate"><span class="pre">$sectionName</span></code> is the name of
the section used by any child view to name the content section. If the boolean argument <code class="docutils literal notranslate"><span class="pre">$saveData</span></code> is set to true,
the method saves data for subsequent calls. Otherwise, the method cleans the data after displaying the contents.</p>
<p>E.g. <strong>app/Views/welcome_message.php</strong>:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;!</span><span class="nx">doctype</span> <span class="nx">html</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">html</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">head</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">title</span><span class="o">&gt;&lt;?=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">renderSection</span><span class="p">(</span><span class="s1">&#39;page_title&#39;</span><span class="p">,</span> <span class="k">true</span><span class="p">)</span> <span class="cp">?&gt;</span><span class="p">&lt;/</span><span class="nt">title</span><span class="p">&gt;</span>
<span class="p">&lt;/</span><span class="nt">head</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">body</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">h1</span><span class="p">&gt;</span><span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">renderSection</span><span class="p">(</span><span class="s1">&#39;page_title&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span><span class="p">&lt;</span><span class="nt">h1</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">p</span><span class="p">&gt;</span><span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">renderSection</span><span class="p">(</span><span class="s1">&#39;content&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span><span class="p">&lt;/</span><span class="nt">p</span><span class="p">&gt;</span>
<span class="p">&lt;/</span><span class="nt">body</span><span class="p">&gt;</span>
<span class="p">&lt;/</span><span class="nt">html</span><span class="p">&gt;</span>
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><code class="docutils literal notranslate"><span class="pre">$saveData</span></code> can be used since v4.4.0.</p>
</div>
</section>
<section id="using-layouts-in-views">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Using Layouts in Views</a><a class="headerlink" href="#using-layouts-in-views" title="Permalink to this heading"></a></h2>
<p>Whenever a view wants to be inserted into a layout, it must use the <code class="docutils literal notranslate"><span class="pre">extend()</span></code> method at the top of the file:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">extend</span><span class="p">(</span><span class="s1">&#39;default&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">extend()</span></code> method takes the name of any view file that you wish to use. Since they are standard views, they will
be located just like a view. By default, it will look in the applications View directory, but will also scan
other PSR-4 defined namespaces. You can include a namespace to locate the view in particular namespace View directory:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">extend</span><span class="p">(</span><span class="s1">&#39;Blog\Views\default&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
</pre></div>
</div>
<p>All content within a view that extends a layout must be included within <code class="docutils literal notranslate"><span class="pre">section($name)</span></code> and <code class="docutils literal notranslate"><span class="pre">endSection()</span></code> method calls.
Any content between these calls will be inserted into the layout wherever the <code class="docutils literal notranslate"><span class="pre">renderSection($name)</span></code> call that
matches the section name exists.</p>
<p>E.g. <strong>app/Views/some_view.php</strong>:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">extend</span><span class="p">(</span><span class="s1">&#39;default&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">section</span><span class="p">(</span><span class="s1">&#39;content&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="p">&lt;</span><span class="nt">h1</span><span class="p">&gt;</span>Hello World!<span class="p">&lt;/</span><span class="nt">h1</span><span class="p">&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">endSection</span><span class="p">()</span> <span class="cp">?&gt;</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">endSection()</span></code> does not need the section name. It automatically knows which one to close.</p>
<p>Sections can contain nested sections:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">extend</span><span class="p">(</span><span class="s1">&#39;default&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">section</span><span class="p">(</span><span class="s1">&#39;content&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="p">&lt;</span><span class="nt">h1</span><span class="p">&gt;</span>Hello World!<span class="p">&lt;/</span><span class="nt">h1</span><span class="p">&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">section</span><span class="p">(</span><span class="s1">&#39;javascript&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
let a = &#39;a&#39;;
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">endSection</span><span class="p">()</span> <span class="cp">?&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">endSection</span><span class="p">()</span> <span class="cp">?&gt;</span>
</pre></div>
</div>
</section>
<section id="rendering-the-view">
<h2><a class="toc-backref" href="#id4" role="doc-backlink">Rendering the View</a><a class="headerlink" href="#rendering-the-view" title="Permalink to this heading"></a></h2>
<p>Rendering the view and its layout is done exactly as any other view would be displayed within a controller:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>
<span class="k">class</span> <span class="nc">MyController</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
<span class="p">{</span>
<span class="k">return</span> <span class="nx">view</span><span class="p">(</span><span class="s1">&#39;some_view&#39;</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>It renders the View <strong>app/Views/some_view.php</strong> and if it extends <code class="docutils literal notranslate"><span class="pre">default</span></code>,
the Layout <strong>app/Views/default.php</strong> is also used automatically.
The renderer is smart enough to detect whether the view should be rendered on its own, or if it needs a layout.</p>
</section>
<section id="including-view-partials">
<h2><a class="toc-backref" href="#id5" role="doc-backlink">Including View Partials</a><a class="headerlink" href="#including-view-partials" title="Permalink to this heading"></a></h2>
<p>View partials are view files that do not extend any layout. They typically include content that can be reused from
view to view. When using view layouts you must use <code class="docutils literal notranslate"><span class="pre">$this-&gt;include()</span></code> to include any view partials.</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">extend</span><span class="p">(</span><span class="s1">&#39;default&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">section</span><span class="p">(</span><span class="s1">&#39;content&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="p">&lt;</span><span class="nt">h1</span><span class="p">&gt;</span>Hello World!<span class="p">&lt;/</span><span class="nt">h1</span><span class="p">&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">include</span><span class="p">(</span><span class="s1">&#39;sidebar&#39;</span><span class="p">)</span> <span class="cp">?&gt;</span>
<span class="cp">&lt;?</span><span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">endSection</span><span class="p">()</span> <span class="cp">?&gt;</span>
</pre></div>
</div>
<p>When calling the <code class="docutils literal notranslate"><span class="pre">include()</span></code> method, you can pass it all of the same options that can when rendering a normal view, including
cache directives, etc.</p>
</section>
</section>
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