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<h1>Communicate Between Components</h1>
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<div class="subHeader"></div>
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<p>For parent-child communication, simply <a href="/react/docs/multiple-components.html">pass props</a>.</p>
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<p>For child-parent communication:
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Say your <code>GroceryList</code> component has a list of items generated through an array. When a list item is clicked, you want to display its name:</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">GroceryList</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">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="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">'You clicked: '</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">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="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">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="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> <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> <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>
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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">'Apple'</span><span class="p">,</span> <span class="s1">'Banana'</span><span class="p">,</span> <span class="s1">'Cranberry'</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>Notice the use of <code>bind(this, arg1, arg2, ...)</code>: we're simply passing more arguments to <code>handleClick</code>. This is not a new React concept; it's just JavaScript.</p>
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<p>For communication between two components that don't have a parent-child relationship, you can set up your own global event system. Subscribe to events in <code>componentDidMount()</code>, unsubscribe in <code>componentWillUnmount()</code>, and when you receive an event, call <code>setState()</code>.</p>
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