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Paul O’Shannessy
310 lines
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HTML
310 lines
24 KiB
HTML
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<li><a href="/react/docs/syntax.html">JSX Syntax</a></li>
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<li><a href="/react/docs/component-basics.html">Component Basics</a></li>
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<li><a href="/react/docs/component-lifecycle.html">Component Lifecycle</a></li>
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<li><a href="/react/docs/event-handling.html" class="active">Event Handling</a></li>
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<div class="inner-content">
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<h1>Event Handling</h1>
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<div class="subHeader">How do events work with React components?</div>
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<p>Events in React work the way they do with HTML, except the event names are
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camelCased.</p>
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<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">Clicker</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">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="o"><</span><span class="nx">span</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><span class="nx">Click</span> <span class="nx">me</span><span class="o">!<</span><span class="err">/span>;</span>
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<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">event</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">alert</span><span class="p">(</span><span class="s1">'You clicked me!'</span><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>When <code><Clicker></code> is clicked, the <code>handleClick()</code> function will get fired. Under
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the hood, React uses top-level event delegation to achieve high performance.</p>
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<h2>Automatically Binding Callbacks</h2>
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<p>Just like any callback in JavaScript, if you want to refer to the component as
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<code>this</code> from the callback, you need to bind the callback to the component:</p>
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<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">Clicker</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">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="hll"> <span class="kd">var</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="k">return</span> <span class="o"><</span><span class="nx">span</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><span class="nx">Click</span> <span class="nx">me</span><span class="o">!<</span><span class="err">/span>;</span>
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<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">event</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">alert</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">ALERT_MESSAGE</span><span class="p">);</span>
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<span class="p">},</span>
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<span class="nx">ALERT_MESSAGE</span><span class="o">:</span> <span class="s1">'You clicked me!'</span>
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<span class="p">});</span>
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</code></pre></div>
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<p>React provides a convenient and <em>efficient</em> way to bind methods using
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<code>React.autoBind()</code>:</p>
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<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">Clicker</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">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="hll"> <span class="k">return</span> <span class="o"><</span><span class="nx">span</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><span class="nx">Click</span> <span class="nx">me</span><span class="o">!<</span><span class="err">/span>;</span>
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</span> <span class="p">},</span>
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<span class="hll"> <span class="nx">handleClick</span><span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">autoBind</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">event</span><span class="p">)</span> <span class="p">{</span>
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</span><span class="hll"> <span class="nx">alert</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">ALERT_MESSAGE</span><span class="p">);</span>
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</span><span class="hll"> <span class="p">}),</span>
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</span> <span class="nx">ALERT_MESSAGE</span><span class="o">:</span> <span class="s1">'You clicked me!'</span>
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<span class="p">});</span>
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</code></pre></div>
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<blockquote>
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<p>Note:</p>
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<p>Binding a function allocates memory to create a new bound function. Since
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<code>render()</code> may be invoked many times, it is a bad place to bind functions.
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<code>React.autoBind()</code> sidesteps this issue by only binding once at instantiation
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time.</p>
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</blockquote>
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<h2>DOM Events</h2>
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<p>React uses <a href="http://davidwalsh.name/event-delegate">top-level event delegation</a>
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to achieve high performance when implementing DOM events. For each type of DOM
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event, React adds a single top-level listener and determines which event
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handlers to execute by simulating event capturing and bubbling.</p>
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<p>DOM event handlers are called with a normalized <code>AbstractEvent</code> object that has
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cross-browser compatible implementations of <code>stopPropagation</code> and
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<code>preventDefault()</code>. If you need access to the raw browser event, you can use the
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<code>nativeEvent</code> property.</p>
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<blockquote>
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<p>Note:</p>
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<p>The <code>AbstractEvent</code> object is JSON serializable so that React applications can
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be executed inside web workers.</p>
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</blockquote>
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<h3>Touch Events</h3>
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<p>If you want to use touch events, you must configure React's event system to
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initialize them:</p>
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<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="c1">// Invoke before calling `React.renderComponent()`.</span>
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<span class="nx">React</span><span class="p">.</span><span class="nx">initializeTouchEvents</span><span class="p">(</span><span class="kc">true</span><span class="p">);</span>
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</code></pre></div>
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<h2>Custom Events</h2>
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<p>Notice that event listeners are attached by simply passing them into components
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as props. For DOM components, events are handled using top-level event
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delegation. For composite components, event handling is up to the component's
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implementation.</p>
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<p>Here is an example of a toggle link that fires a custom <code>onToggle</code> event:</p>
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<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">ToggleLink</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">getInitialState</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><span class="nx">isEnabled</span><span class="o">:</span> <span class="kc">false</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="o"><</span><span class="nx">a</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><span class="nx">Toggle</span><span class="o"><</span><span class="err">/a>;</span>
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<span class="p">},</span>
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<span class="nx">handleClick</span><span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">autoBind</span><span class="p">(</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">willEnable</span> <span class="o">=</span> <span class="o">!</span><span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">isEnabled</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">onToggle</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">onToggle</span><span class="p">(</span><span class="nx">willEnable</span><span class="p">)</span>
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<span class="p">}</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">isEnabled</span><span class="o">:</span> <span class="nx">willEnable</span><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="kd">var</span> <span class="nx">handleToggle</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">enabled</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">alert</span><span class="p">(</span><span class="nx">enabled</span> <span class="o">?</span> <span class="s1">'Enabled.'</span> <span class="o">:</span> <span class="s1">'Disabled.'</span><span class="p">);</span>
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<span class="p">};</span>
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<span class="kd">var</span> <span class="nx">myToggleLink</span> <span class="o">=</span> <span class="o"><</span><span class="nx">ToggleLink</span> <span class="nx">onToggle</span><span class="o">=</span><span class="p">{</span><span class="nx">handleToggle</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
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</code></pre></div>
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<h3>Common Patterns</h3>
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<p>With React your event handlers should be quite small. Large event handlers may
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be symptomatic of code that should be moved into helpers or into <code>render()</code>.
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Here are some common usage patterns for event handlers.</p>
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<h4>Updating State</h4>
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<p>The most common thing to do in response to a user action is to call
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<code>this.setState()</code> to update the component's state, which will in turn trigger
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an update to the rendered component.</p>
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<h4>Server Requests</h4>
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<p>Many event handlers will issue a server request to read or write some data in
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response to an event. The response handler for the request will often call
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<code>this.setState()</code>.</p>
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<h4>Invoke a Callback</h4>
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<p>Your component will often be a small, reusable building block that does not know
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how to respond to a user action. In these situations, we delegate the
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responsibility to the owner by exposing a handler on <code>this.props</code>. This is what
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the <code>ToggleLink</code> example above is doing.</p>
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<h4>Inter-component Communication</h4>
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<p>A common scenario involves communicating to <strong>Component A</strong> that a user action
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has occurred on <strong>Component B</strong>. To solve this problem, a common parent to
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both components should listen for the event on <strong>Component B</strong>, update its
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internal state, and pass that data into <strong>Component A</strong>.</p>
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<p>For example, say we have two components: <strong>Clicker</strong>, a component that fires an
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<code>onCountChange</code> custom event, and <strong>ClickCountLabel</strong>, a component that displays
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the number of clicks that have happened:</p>
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<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">Clicker</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">getInitialState</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><span class="nx">count</span><span class="o">:</span> <span class="mi">0</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="o"><</span><span class="nx">span</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><span class="nx">Click</span> <span class="nx">me</span><span class="o">!<</span><span class="err">/span>;</span>
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<span class="p">},</span>
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<span class="nx">handleClick</span><span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">autoBind</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">count</span><span class="o">:</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">count</span> <span class="o">+</span> <span class="mi">1</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">onCountChange</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">onCountChange</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">count</span><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="p">});</span>
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<span class="kd">var</span> <span class="nx">ClickCountLabel</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">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="o"><</span><span class="nx">p</span><span class="o">></span><span class="nx">You</span> <span class="nx">have</span> <span class="nx">clicked</span> <span class="o"><</span><span class="nx">strong</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">count</span><span class="p">}</span><span class="o"><</span><span class="err">/strong> times.</p>;</span>
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<span class="p">}</span>
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<span class="p">});</span>
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<span class="kd">var</span> <span class="nx">ClickApp</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">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">count</span> <span class="o">=</span> <span class="mi">0</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="o"><</span><span class="nx">Clicker</span> <span class="nx">onCountChange</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">handleCountChange</span><span class="p">}</span> <span class="o">/></span>
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<span class="o"><</span><span class="nx">ClickCountLabel</span> <span class="nx">count</span><span class="o">=</span><span class="p">{</span><span class="nx">count</span><span class="p">}</span> <span class="o">/></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">handleCountChange</span><span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">autoBind</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">count</span><span class="p">)</span> <span class="p">{</span>
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<span class="c1">// Somehow update `count`.</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>In order to communicate the click count from <code>Clicker</code> to <code>ClickCountLabel</code>, we
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modify <code>ClickApp</code> to maintain state that will be passed into <code>ClickCountLabel</code>:</p>
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<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">ClickApp</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="hll"> <span class="nx">getInitialState</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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</span><span class="hll"> <span class="k">return</span> <span class="p">{</span><span class="nx">count</span><span class="o">:</span> <span class="mi">0</span><span class="p">};</span>
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</span><span class="hll"> <span class="p">},</span>
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</span> <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="hll"> <span class="kd">var</span> <span class="nx">count</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">count</span><span class="p">;</span>
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</span> <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="o"><</span><span class="nx">Clicker</span> <span class="nx">onCountChange</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">handleCountChange</span><span class="p">}</span> <span class="o">/></span>
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|
<span class="o"><</span><span class="nx">ClickCountLabel</span> <span class="nx">count</span><span class="o">=</span><span class="p">{</span><span class="nx">count</span><span class="p">}</span> <span class="o">/></span>
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|
<span class="o"><</span><span class="err">/div></span>
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|
<span class="p">);</span>
|
|
<span class="p">},</span>
|
|
<span class="nx">handleCountChange</span><span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">autoBind</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">count</span><span class="p">)</span> <span class="p">{</span>
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|
<span class="hll"> <span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">count</span><span class="o">:</span> <span class="nx">count</span><span class="p">});</span>
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|
</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>Now when <code>Clicker</code> fires the <code>onCountChange</code> event, the <code>ClickCountLabel</code> will
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get updated!</p>
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