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<time class="post-full-meta-date" datetime=" 1 October 2019"> 1 October 2019</time>
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<a href='/category/react/'>REACT</a>
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<h1 class="post-full-title">React 튜토리얼 2</h1>
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<h3 id="1-시작하기">1. 시작하기</h3>
<p>시작 코드를 가지고 시작해봅시다.</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">class</span> <span class="nx">Square</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">button</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">square</span><span class="dl">"</span><span class="o">></span>
<span class="p">{</span><span class="cm">/* TODO */</span><span class="p">}</span>
<span class="o"><</span><span class="sr">/button</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="kd">class</span> <span class="nx">Board</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="nx">renderSquare</span><span class="p">(</span><span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="o"><</span><span class="nx">Square</span> <span class="o">/></span><span class="p">;</span>
<span class="p">}</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">const</span> <span class="nx">status</span> <span class="o">=</span> <span class="dl">'</span><span class="s1">Next player: X</span><span class="dl">'</span><span class="p">;</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">div</span><span class="o">></span>
<span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">status</span><span class="dl">"</span><span class="o">></span><span class="p">{</span><span class="nx">status</span><span class="p">}</span><span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">board-row</span><span class="dl">"</span><span class="o">></span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">0</span><span class="p">)}</span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">1</span><span class="p">)}</span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">2</span><span class="p">)}</span>
<span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">board-row</span><span class="dl">"</span><span class="o">></span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">3</span><span class="p">)}</span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">4</span><span class="p">)}</span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">5</span><span class="p">)}</span>
<span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">board-row</span><span class="dl">"</span><span class="o">></span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">6</span><span class="p">)}</span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">7</span><span class="p">)}</span>
<span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">renderSquare</span><span class="p">(</span><span class="mi">8</span><span class="p">)}</span>
<span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="kd">class</span> <span class="nx">Game</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">game</span><span class="dl">"</span><span class="o">></span>
<span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">game-board</span><span class="dl">"</span><span class="o">></span>
<span class="o"><</span><span class="nx">Board</span> <span class="o">/></span>
<span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">game-info</span><span class="dl">"</span><span class="o">></span>
<span class="o"><</span><span class="nx">div</span><span class="o">></span><span class="p">{</span><span class="cm">/* status */</span><span class="p">}</span><span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="o"><</span><span class="nx">ol</span><span class="o">></span><span class="p">{</span><span class="cm">/* TODO */</span><span class="p">}</span><span class="o"><</span><span class="sr">/ol</span><span class="err">>
</span> <span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="c1">// ========================================</span>
<span class="nx">ReactDOM</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span>
<span class="o"><</span><span class="nx">Game</span> <span class="o">/></span><span class="p">,</span>
<span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="dl">'</span><span class="s1">root</span><span class="dl">'</span><span class="p">)</span>
<span class="p">);</span>
</code></pre></div></div>
<p>이 코드는 우리가 구현할 틱택토 게임의 틀을 가지고 있습니다. 필요한 스타일들을 준비해두었기 때문에 JavaScript만 신경쓰면 됩니다.</p>
<p>세 가지 컴포넌트로 구성되어 있습니다:</p>
<p>-Square
-Board
-Game</p>
<p>Square 컴포넌트는 하나의 <code class="language-plaintext highlighter-rouge"><button></code>을 랜더링합니다. Board 컴포넌트는 9개의 사각형을 랜더링합니다. Game 컴포넌트는 나중에 우리가 채워 넣어야 할 공백이 있는 하나의 보드를 랜더링합니다. 지금 이 컴포넌트들은 아무런 동작도 하지 않습니다.</p>
<p>props를 통해 데이터 전달하기
본격적으로 시작하기 위해 데이터를 Board 컴포넌트에서 Square 컴포넌트로 전달해봅시다.</p>
<p>Board의 renderSquare 메서드에서 Square 컴포넌트 prop에 value 값을 전달하도록 코드를 변경해주세요</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">class</span> <span class="nx">Board</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="nx">renderSquare</span><span class="p">(</span><span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="o"><</span><span class="nx">Square</span> <span class="nx">value</span><span class="o">=</span><span class="p">{</span><span class="nx">i</span><span class="p">}</span> <span class="sr">/></span><span class="err">;
</span> <span class="p">}</span>
</code></pre></div></div>
<p>value 값을 보여주기 위해 Square 컴포넌트의 render 메서드 안의 코드 {/* TODO */}를 {this.props.value}로 변경해주세요</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">class</span> <span class="nx">Square</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">button</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">square</span><span class="dl">"</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">value</span><span class="p">}</span>
<span class="o"><</span><span class="sr">/button</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div></div>
<p>대화형 컴포넌트
클릭 시 “X”로 채워지는 Square 컴포넌트를 만들어봅시다. Square의 render() 함수에서 반환된 버튼 태그를 다음과 같이 변경해주세요</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">class</span> <span class="nx">Square</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">button</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">square</span><span class="dl">"</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{()</span> <span class="o">=></span> <span class="nx">alert</span><span class="p">(</span><span class="dl">'</span><span class="s1">click</span><span class="dl">'</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">value</span><span class="p">}</span>
<span class="o"><</span><span class="sr">/button</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div></div>
<p>이제 사각형을 클릭하면 브라우저에서 알럿창이 뜨는걸 확인할 수 있습니다.</p>
<p>새로운 JavaScript 문법인 화살표 함수를 사용하였습니다. onClick prop에 함수를 전달하였습니다. onClick={alert(‘click’)} 코드를 작성하고 버튼을 클릭하면 알럿창 대신 경고가 뜨게됩니다.</p>
<p>React 컴포넌트는 생성자에서 this.state를 설정하여 state를 가질 수 있고 state는 컴포넌트에서 private으로 간주되어야 합니다. 사각형의 현재 value 값을 상태에 저장하고 클릭할 때 바뀌도록 만들어봅시다.</p>
<p>먼저 state를 초기화하기 위해 클래스에 생성자를 추가해주세요</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">class</span> <span class="nx">Square</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="kd">constructor</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
<span class="k">super</span><span class="p">(</span><span class="nx">props</span><span class="p">);</span>
<span class="k">this</span><span class="p">.</span><span class="nx">state</span> <span class="o">=</span> <span class="p">{</span>
<span class="na">value</span><span class="p">:</span> <span class="kc">null</span><span class="p">,</span>
<span class="p">};</span>
<span class="p">}</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">button</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">square</span><span class="dl">"</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{()</span> <span class="o">=></span> <span class="nx">alert</span><span class="p">(</span><span class="dl">'</span><span class="s1">click</span><span class="dl">'</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">value</span><span class="p">}</span>
<span class="o"><</span><span class="sr">/button</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div></div>
<p>JavaScript 클래스에서 서브클래스의 생성자를 정의할 때 super(); 메서드를 명시적으로 호출해줘야 합니다.</p>
<p>이제 Square의 render 메서드에서 현재 상태의 value 값을 표시하고 클릭할 때 바뀌도록 수정해주세요.</p>
<p><code class="language-plaintext highlighter-rouge"><button></code> 태그 안의 this.props.value 를 this.state.value로 변경해주세요.
() => alert() 이벤트 핸들러를 () => this.setState({value: ‘X’})로 변경해주세요.
<code class="language-plaintext highlighter-rouge"><button></code> 태그는 다음과 같습니다</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">class</span> <span class="nx">Square</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="kd">constructor</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
<span class="k">super</span><span class="p">(</span><span class="nx">props</span><span class="p">);</span>
<span class="k">this</span><span class="p">.</span><span class="nx">state</span> <span class="o">=</span> <span class="p">{</span>
<span class="na">value</span><span class="p">:</span> <span class="kc">null</span><span class="p">,</span>
<span class="p">};</span>
<span class="p">}</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">button</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">square</span><span class="dl">"</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{()</span> <span class="o">=></span> <span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="na">value</span><span class="p">:</span> <span class="dl">'</span><span class="s1">X</span><span class="dl">'</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">state</span><span class="p">.</span><span class="nx">value</span><span class="p">}</span>
<span class="o"><</span><span class="sr">/button</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div></div>
<p>this.setState가 호출될 때마다 컴포넌트가 업데이트되므로 업데이트된 state가 전달되어 React가 이를 병합하고 하위 컴포넌트와 함께 다시 랜더링합니다. 컴포넌트가 랜더링될 때 this.state.value는 ‘X’가 되어 그리드 안에 X가 보이게 됩니다.</p>
<p>이제 사각형을 클릭하면 그 안에 X가 표시됩니다.</p>
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