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<h1>Expose Component Functions</h1>
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<div class="subHeader"></div>
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<p>There's another (uncommon) way of <a href="/react/tips/communicate-between-components.html">communicating between components</a>: simply expose a method on the child component for the parent to call.</p>
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<p>Say a list of todos, which upon clicking get removed. If there's only one unfinished todo left, animate it:</p>
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<div class="highlight"><pre><code class="js language-js" data-lang="js"><span class="cm">/** @jsx React.DOM */</span>
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<span class="kd">var</span> <span class="nx">Todo</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
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<span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">return</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">onClick</span><span class="p">}</span><span class="o">></span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">title</span><span class="p">}</span><span class="o"><</span><span class="err">/div>;</span>
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<span class="p">},</span>
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<span class="c1">//this component will be accessed by the parent through the `ref` attribute</span>
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<span class="nx">animate</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">'Pretend %s is animating'</span><span class="p">,</span> <span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">title</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="p">});</span>
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<span class="kd">var</span> <span class="nx">Todos</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
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<span class="nx">getInitialState</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">return</span> <span class="p">{</span><span class="nx">items</span><span class="o">:</span> <span class="p">[</span><span class="s1">'Apple'</span><span class="p">,</span> <span class="s1">'Banana'</span><span class="p">,</span> <span class="s1">'Cranberry'</span><span class="p">]};</span>
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<span class="p">},</span>
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<span class="nx">handleClick</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">index</span><span class="p">)</span> <span class="p">{</span>
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<span class="kd">var</span> <span class="nx">items</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">.</span><span class="nx">filter</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">item</span><span class="p">,</span> <span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nx">index</span> <span class="o">!==</span> <span class="nx">i</span><span class="p">;</span>
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<span class="p">});</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">items</span><span class="o">:</span> <span class="nx">items</span><span class="p">},</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="nx">items</span><span class="p">.</span><span class="nx">length</span> <span class="o">===</span> <span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">refs</span><span class="p">.</span><span class="nx">item0</span><span class="p">.</span><span class="nx">animate</span><span class="p">();</span>
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<span class="p">}</span>
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<span class="p">}.</span><span class="nx">bind</span><span class="p">(</span><span class="k">this</span><span class="p">));</span>
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<span class="p">},</span>
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<span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">return</span> <span class="p">(</span>
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<span class="o"><</span><span class="nx">div</span><span class="o">></span>
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<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">item</span><span class="p">,</span> <span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
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<span class="kd">var</span> <span class="nx">boundClick</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">handleClick</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="nx">i</span><span class="p">);</span>
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<span class="k">return</span> <span class="p">(</span>
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<span class="o"><</span><span class="nx">Todo</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="nx">boundClick</span><span class="p">}</span> <span class="nx">key</span><span class="o">=</span><span class="p">{</span><span class="nx">i</span><span class="p">}</span> <span class="nx">title</span><span class="o">=</span><span class="p">{</span><span class="nx">item</span><span class="p">}</span> <span class="nx">ref</span><span class="o">=</span><span class="p">{</span><span class="s1">'item'</span> <span class="o">+</span> <span class="nx">i</span><span class="p">}</span> <span class="o">/></span>
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<span class="p">);</span>
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<span class="p">},</span> <span class="k">this</span><span class="p">)}</span>
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<span class="o"><</span><span class="err">/div></span>
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<span class="p">);</span>
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<span class="p">}</span>
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<span class="p">});</span>
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<span class="nx">React</span><span class="p">.</span><span class="nx">renderComponent</span><span class="p">(</span><span class="o"><</span><span class="nx">Todos</span> <span class="o">/></span><span class="p">,</span> <span class="nx">mountNode</span><span class="p">);</span>
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</code></pre></div>
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<p>Alternatively, you could have achieved this by passing the <code>todo</code> an <code>isLastUnfinishedItem</code> prop, let it check this prop in <code>componentDidUpdate</code>, then animate itself; however, this quickly gets messy if you pass around different props to control animations.</p>
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<div class="docs-prevnext">
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