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<h1>컴포넌트간의 통신</h1>
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<div class="subHeader"></div>
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<p>부모-자식 통신을 위해서는, 간단히 <a href="/react/docs/multiple-components-ko-KR.html">props를 넘기면 됩니다</a>.</p>
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<p>자식-부모 통신을 위해서는:
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<code>GroceryList</code> 컴포넌트가 배열로 생성된 아이템 목록을 가지고 있다고 해봅시다. 목록의 아이템이 클릭되면 아이템의 이름이 보이길 원할 겁니다:</p>
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<div class="highlight"><pre><code class="language-js" data-lang="js"><span class="kd">var</span> <span class="nx">handleClick</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">i</span><span class="p">,</span> <span class="nx">props</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">'클릭한 아이템: '</span> <span class="o">+</span> <span class="nx">props</span><span class="p">.</span><span class="nx">items</span><span class="p">[</span><span class="nx">i</span><span class="p">]);</span>
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<span class="p">}</span>
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<span class="kd">function</span> <span class="nx">GroceryList</span><span class="p">(</span><span class="nx">props</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="nx">props</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="k">return</span> <span class="p">(</span>
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<span class="o"><</span><span class="nx">div</span> <span class="nx">onClick</span><span class="o">=</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> <span class="nx">props</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="o">></span><span class="p">{</span><span class="nx">item</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="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="nx">ReactDOM</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span>
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<span class="o"><</span><span class="nx">GroceryList</span> <span class="nx">items</span><span class="o">=</span><span class="p">{[</span><span class="s1">'사과'</span><span class="p">,</span> <span class="s1">'바나나'</span><span class="p">,</span> <span class="s1">'크랜베리'</span><span class="p">]}</span> <span class="o">/></span><span class="p">,</span> <span class="nx">mountNode</span>
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<span class="p">);</span>
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</code></pre></div>
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<p><code>bind(this, arg1, arg2, ...)</code>의 사용을 확인하세요: 간단히 <code>handleClick</code>에 인자를 더 넘겼습니다. 이는 React의 새로운 컨셉이 아닙니다; 그냥 JavaScript죠.</p>
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<p>부모-자식 관계가 없는 두 컴포넌트간의 통신을 위해, 별도로 전역(global) 이벤트 시스템을 사용할 수 있습니다. <code>componentDidMount()</code>에서 이벤트를 구독하고, <code>componentWillUnmount()</code>에서 해제합니다. 이벤트를 받으면 <code>setState()</code>를 호출합니다. <a href="https://facebook.github.io/flux/">Flux</a> 패턴은 이를 정리하는 방법 중 하나입니다.</p>
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A Facebook & Instagram collaboration.<br>
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<a href="/react/acknowledgements.html">Acknowledgements</a>
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