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<h1><code class="docutils literal"><span class="pre">defined</span></code><a class="headerlink" href="#defined" title="Permalink to this headline">ΒΆ</a></h1>
<p><code class="docutils literal"><span class="pre">defined</span></code> checks if a variable is defined in the current context. This is very
useful if you use the <code class="docutils literal"><span class="pre">strict_variables</span></code> option:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="c">{# defined works with variable names #}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">if</span> <span class="nv">foo</span> <span class="k">is</span> <span class="nf">defined</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> ...</span>
<span class="cp">{%</span> <span class="k">endif</span> <span class="cp">%}</span><span class="x"></span>
<span class="c">{# and attributes on variables names #}</span><span class="x"></span>
<span class="cp">{%</span> <span class="k">if</span> <span class="nv">foo.bar</span> <span class="k">is</span> <span class="nf">defined</span> <span class="cp">%}</span><span class="x"></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">if</span> <span class="nv">foo</span><span class="o">[</span><span class="s1">'bar'</span><span class="o">]</span> <span class="k">is</span> <span class="nf">defined</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> ...</span>
<span class="cp">{%</span> <span class="k">endif</span> <span class="cp">%}</span><span class="x"></span>
</pre></div>
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<p>When using the <code class="docutils literal"><span class="pre">defined</span></code> test on an expression that uses variables in some
method calls, be sure that they are all defined first:</p>
<div class="highlight-jinja"><div class="highlight"><pre><span></span><span class="cp">{%</span> <span class="k">if</span> <span class="nv">var</span> <span class="k">is</span> <span class="nf">defined</span> <span class="k">and</span> <span class="nv">foo.method</span><span class="o">(</span><span class="nv">var</span><span class="o">)</span> <span class="k">is</span> <span class="nf">defined</span> <span class="cp">%}</span><span class="x"></span>
<span class="x"> ...</span>
<span class="cp">{%</span> <span class="k">endif</span> <span class="cp">%}</span><span class="x"></span>
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