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<title>Handling Events - React</title>
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/handling-events.md" target="_blank">Edit on GitHub</a>
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<h1>
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Handling Events
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</h1>
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<div class="subHeader"></div>
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<p>Handling events with React elements is very similar to handling events on DOM elements. There are some syntactic differences:</p>
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<ul>
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<li>React events are named using camelCase, rather than lowercase.</li>
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<li>With JSX you pass a function as the event handler, rather than a string.</li>
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</ul>
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<p>For example, the HTML:</p>
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<div class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><button</span> <span class="na">onclick=</span><span class="s">"activateLasers()"</span><span class="nt">></span>
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Activate Lasers
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<span class="nt"></button></span>
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</code></pre></div>
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<p>is slightly different in React:</p>
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<div class="highlight"><pre><code class="language-js" data-lang="js"><span class="hll"><span class="o"><</span><span class="nx">button</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="nx">activateLasers</span><span class="p">}</span><span class="o">></span>
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</span> <span class="nx">Activate</span> <span class="nx">Lasers</span>
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<span class="o"><</span><span class="err">/button></span>
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</code></pre></div>
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<p>Another difference is that you cannot return <code>false</code> to prevent default behavior in React. You must call <code>preventDefault</code> explicitly. For example, with plain HTML, to prevent the default link behavior of opening a new page, you can write:</p>
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<div class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><a</span> <span class="na">href=</span><span class="s">"#"</span> <span class="na">onclick=</span><span class="s">"console.log('The link was clicked.'); return false"</span><span class="nt">></span>
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Click me
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<span class="nt"></a></span>
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</code></pre></div>
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<p>In React, this could instead be:</p>
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<div class="highlight"><pre><code class="language-js" data-lang="js"><span class="kd">function</span> <span class="nx">ActionLink</span><span class="p">()</span> <span class="p">{</span>
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<span class="hll"> <span class="kd">function</span> <span class="nx">handleClick</span><span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
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</span><span class="hll"> <span class="nx">e</span><span class="p">.</span><span class="nx">preventDefault</span><span class="p">();</span>
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</span><span class="hll"> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">'The link was clicked.'</span><span class="p">);</span>
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</span><span class="hll"> <span class="p">}</span>
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</span>
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<span class="k">return</span> <span class="p">(</span>
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<span class="hll"> <span class="o"><</span><span class="nx">a</span> <span class="nx">href</span><span class="o">=</span><span class="s2">"#"</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="o">></span>
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</span> <span class="nx">Click</span> <span class="nx">me</span>
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<span class="o"><</span><span class="err">/a></span>
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<span class="p">);</span>
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<span class="p">}</span>
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</code></pre></div>
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<p>Here, <code>e</code> is a synthetic event. React defines these synthetic events according to the <a href="https://www.w3.org/TR/DOM-Level-3-Events/">W3C spec</a>, so you don't need to worry about cross-browser compatibility. See the <a href="/react/docs/events.html"><code>SyntheticEvent</code></a> reference guide to learn more.</p>
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<p>When using React you should generally not need to call <code>addEventListener</code> to add listeners to a DOM element after it is created. Instead, just provide a listener when the element is initially rendered.</p>
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<p>When you define a component using an <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Classes">ES6 class</a>, a common pattern is for an event handler to be a method on the class. For example, this <code>Toggle</code> component renders a button that lets the user toggle between "ON" and "OFF" states:</p>
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<div class="highlight"><pre><code class="language-js" data-lang="js"><span class="kr">class</span> <span class="nx">Toggle</span> <span class="kr">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
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<span class="nx">constructor</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
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<span class="kr">super</span><span class="p">(</span><span class="nx">props</span><span class="p">);</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">state</span> <span class="o">=</span> <span class="p">{</span><span class="nx">isToggleOn</span><span class="o">:</span> <span class="kc">true</span><span class="p">};</span>
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<span class="hll"> <span class="c1">// This binding is necessary to make `this` work in the callback</span>
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</span><span class="hll"> <span class="k">this</span><span class="p">.</span><span class="nx">handleClick</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>
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</span> <span class="p">}</span>
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<span class="hll"> <span class="nx">handleClick</span><span class="p">()</span> <span class="p">{</span>
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</span><span class="hll"> <span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">(</span><span class="nx">prevState</span> <span class="o">=></span> <span class="p">({</span>
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</span><span class="hll"> <span class="nx">isToggleOn</span><span class="o">:</span> <span class="o">!</span><span class="nx">prevState</span><span class="p">.</span><span class="nx">isToggleOn</span>
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</span><span class="hll"> <span class="p">}));</span>
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</span><span class="hll"> <span class="p">}</span>
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</span>
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<span class="nx">render</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="hll"> <span class="o"><</span><span class="nx">button</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="o">></span>
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</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">isToggleOn</span> <span class="o">?</span> <span class="s1">'ON'</span> <span class="o">:</span> <span class="s1">'OFF'</span><span class="p">}</span>
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<span class="o"><</span><span class="err">/button></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">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">Toggle</span> <span class="o">/></span><span class="p">,</span>
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<span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'root'</span><span class="p">)</span>
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<span class="p">);</span>
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</code></pre></div>
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<p><a href="http://codepen.io/gaearon/pen/xEmzGg?editors=0010">Try it on CodePen.</a></p>
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<p>You have to be careful about the meaning of <code>this</code> in JSX callbacks. In JavaScript, class methods are not <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Function/bind">bound</a> by default. If you forget to bind <code>this.handleClick</code> and pass it to <code>onClick</code>, <code>this</code> will be <code>undefined</code> when the function is actually called.</p>
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<p>This is not React-specific behavior; it is a part of <a href="https://www.smashingmagazine.com/2014/01/understanding-javascript-function-prototype-bind/">how functions work in JavaScript</a>. Generally, if you refer to a method without <code>()</code> after it, such as <code>onClick={this.handleClick}</code>, you should bind that method.</p>
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<p>If calling <code>bind</code> annoys you, there are two ways you can get around this. If you are using the experimental <a href="https://babeljs.io/docs/plugins/transform-class-properties/">public class fields syntax</a>, you can use class fields to correctly bind callbacks:</p>
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<div class="highlight"><pre><code class="language-js" data-lang="js"><span class="kr">class</span> <span class="nx">LoggingButton</span> <span class="kr">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
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<span class="hll"> <span class="c1">// This syntax ensures `this` is bound within handleClick.</span>
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</span><span class="hll"> <span class="c1">// Warning: this is *experimental* syntax.</span>
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</span><span class="hll"> <span class="nx">handleClick</span> <span class="o">=</span> <span class="p">()</span> <span class="o">=></span> <span class="p">{</span>
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</span><span class="hll"> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">'this is:'</span><span class="p">,</span> <span class="k">this</span><span class="p">);</span>
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</span><span class="hll"> <span class="p">}</span>
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</span>
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<span class="nx">render</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">button</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="o">></span>
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<span class="nx">Click</span> <span class="nx">me</span>
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<span class="o"><</span><span class="err">/button></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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</code></pre></div>
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<p>This syntax is enabled by default in <a href="https://github.com/facebookincubator/create-react-app">Create React App</a>.</p>
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<p>If you aren't using class fields syntax, you can use an <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Functions/Arrow_functions">arrow function</a> in the callback:</p>
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<div class="highlight"><pre><code class="language-js" data-lang="js"><span class="kr">class</span> <span class="nx">LoggingButton</span> <span class="kr">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
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<span class="nx">handleClick</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">'this is:'</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="p">()</span> <span class="p">{</span>
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<span class="hll"> <span class="c1">// This syntax ensures `this` is bound within handleClick</span>
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</span><span class="hll"> <span class="k">return</span> <span class="p">(</span>
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</span><span class="hll"> <span class="o"><</span><span class="nx">button</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{(</span><span class="nx">e</span><span class="p">)</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">e</span><span class="p">)}</span><span class="o">></span>
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</span> <span class="nx">Click</span> <span class="nx">me</span>
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<span class="o"><</span><span class="err">/button></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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</code></pre></div>
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<p>The problem with this syntax is that a different callback is created each time the <code>LoggingButton</code> renders. In most cases, this is fine. However, if this callback is passed as a prop to lower components, those components might do an extra re-rendering. We generally recommend binding in the constructor or using the class fields syntax, to avoid this sort of performance problem.</p>
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