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519 lines
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</div>
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<div class="inner-content">
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<h1>
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클래스 이름 조작
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/10.3-class-name-manipulation.ko-KR.md" target="_blank">Edit on GitHub</a>
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</h1>
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<div class="subHeader"></div>
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<blockquote>
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<p>주의:</p>
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<p>이 모듈은 폐기예정입니다. 대신 <a href="https://github.com/JedWatson/classnames">JedWatson/classnames</a>를 사용하세요.</p>
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</blockquote>
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<p><code>classSet()</code>은 간단히 DOM <code>class</code> 문자열을 조작하는 편리한 도구입니다.</p>
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<p>일반적으로 있을법한 경우와 <code>classSet()</code>을 사용하지 않았을 때의 처리법을 보시죠.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// 어떤 `<Message />` React 컴포넌트의 안쪽</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="kd">var</span> <span class="nx">classString</span> <span class="o">=</span> <span class="s1">'message'</span><span class="p">;</span>
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<span class="k">if</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">isImportant</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">classString</span> <span class="o">+=</span> <span class="s1">' message-important'</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">if</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">isRead</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">classString</span> <span class="o">+=</span> <span class="s1">' message-read'</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="c1">// 'message message-important message-read'</span>
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<span class="k">return</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="p">{</span><span class="nx">classString</span><span class="p">}</span><span class="o">></span><span class="err">좋아요</span><span class="p">,</span> <span class="err">거기서</span> <span class="err">봅시다</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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</code></pre></div>
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<p>이것은 순식간에 장황해질 수 있습니다. 클래스 이름 문자열은 읽기 어렵고 에러가 발생하기도 쉽죠. <code>classSet()</code>가 이 문제를 해결할 수 있습니다.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><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="kd">var</span> <span class="nx">cx</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">addons</span><span class="p">.</span><span class="nx">classSet</span><span class="p">;</span>
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<span class="kd">var</span> <span class="nx">classes</span> <span class="o">=</span> <span class="nx">cx</span><span class="p">({</span>
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<span class="s1">'message'</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
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<span class="s1">'message-important'</span><span class="o">:</span> <span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">isImportant</span><span class="p">,</span>
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<span class="s1">'message-read'</span><span class="o">:</span> <span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">isRead</span>
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<span class="p">});</span>
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<span class="c1">// 최종 문자열은 동일하지만, 훨씬 깔끔함</span>
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<span class="k">return</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="p">{</span><span class="nx">classes</span><span class="p">}</span><span class="o">></span><span class="err">좋아요</span><span class="p">,</span> <span class="err">거기서</span> <span class="err">봅시다</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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</code></pre></div>
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<p><code>classSet()</code>을 사용할 때 사용할지 안할지 잘 모르는 CSS 클래스 이름 키와 함께 객체를 전달합니다. true로 간주되는(Truthy) 값은 키를 결과 문자열의 일부로 만듭니다.</p>
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<p><code>classSet()</code>은 클래스 이름을 인자로 넘겨 연결되게 할 수도 있습니다.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><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="kd">var</span> <span class="nx">cx</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">addons</span><span class="p">.</span><span class="nx">classSet</span><span class="p">;</span>
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<span class="kd">var</span> <span class="nx">importantModifier</span> <span class="o">=</span> <span class="s1">'message-important'</span><span class="p">;</span>
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<span class="kd">var</span> <span class="nx">readModifier</span> <span class="o">=</span> <span class="s1">'message-read'</span><span class="p">;</span>
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<span class="kd">var</span> <span class="nx">classes</span> <span class="o">=</span> <span class="nx">cx</span><span class="p">(</span><span class="s1">'message'</span><span class="p">,</span> <span class="nx">importantModifier</span><span class="p">,</span> <span class="nx">readModifier</span><span class="p">);</span>
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<span class="c1">// 최종 문자열은 'message message-important message-read'</span>
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<span class="k">return</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="p">{</span><span class="nx">classes</span><span class="p">}</span><span class="o">></span><span class="err">좋아요</span><span class="p">,</span> <span class="err">거기서</span> <span class="err">봅시다</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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</code></pre></div>
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<p>복잡한 문자열 연결은 이제 안하셔도 됩니다!</p>
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