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642 lines
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<title>事件系统 | React</title>
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<h3>Tips</h3>
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<a href="/react/tips/introduction.html">Introduction</a>
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<a href="/react/tips/maximum-number-of-jsx-root-nodes.html">Maximum Number of JSX Root Nodes</a>
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<a href="/react/tips/style-props-value-px.html">Shorthand for Specifying Pixel Values in style props</a>
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<a href="/react/tips/children-props-type.html">Type of the Children props</a>
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<a href="/react/tips/props-in-getInitialState-as-anti-pattern.html">Props in getInitialState Is an Anti-Pattern</a>
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<a href="/react/tips/dom-event-listeners.html">DOM Event Listeners in a Component</a>
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<a href="/react/tips/initial-ajax.html">Load Initial Data via AJAX</a>
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<a href="/react/tips/false-in-jsx.html">False in JSX</a>
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<a href="/react/tips/communicate-between-components.html">Communicate Between Components</a>
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<a href="/react/tips/expose-component-functions.html">Expose Component Functions</a>
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<a href="/react/tips/children-undefined.html">this.props.children undefined</a>
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<a href="/react/tips/use-react-with-other-libraries.html">Use React with Other Libraries</a>
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<a href="/react/tips/dangerously-set-inner-html.html">Dangerously Set innerHTML</a>
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</div>
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</div>
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<div class="inner-content">
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<h1>
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事件系统
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/ref-05-events.zh-CN.md" target="_blank">Edit on GitHub</a>
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</h1>
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<div class="subHeader"></div>
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<h2><a class="anchor" name=""></a>合成事件 <a class="hash-link" href="#">#</a></h2>
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<p>事件处理程序通过 <code>合成事件</code>（<code>SyntheticEvent</code>）的实例传递，<code>SyntheticEvent</code> 是浏览器原生事件跨浏览器的封装。<code>SyntheticEvent</code> 和浏览器原生事件一样有 <code>stopPropagation()</code>、<code>preventDefault()</code> 接口，而且这些接口夸浏览器兼容。</p>
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<p>如果出于某些原因想使用浏览器原生事件，可以使用 <code>nativeEvent</code> 属性获取。每个和成事件（<code>SyntheticEvent</code>）对象都有以下属性：</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">bubbles</span>
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<span class="kr">boolean</span> <span class="nx">cancelable</span>
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<span class="nx">DOMEventTarget</span> <span class="nx">currentTarget</span>
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<span class="kr">boolean</span> <span class="nx">defaultPrevented</span>
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<span class="nx">number</span> <span class="nx">eventPhase</span>
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<span class="kr">boolean</span> <span class="nx">isTrusted</span>
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<span class="nx">DOMEvent</span> <span class="nx">nativeEvent</span>
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<span class="k">void</span> <span class="nx">preventDefault</span><span class="p">()</span>
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<span class="kr">boolean</span> <span class="nx">isDefaultPrevented</span><span class="p">()</span>
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<span class="k">void</span> <span class="nx">stopPropagation</span><span class="p">()</span>
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<span class="kr">boolean</span> <span class="nx">isPropagationStopped</span><span class="p">()</span>
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<span class="nx">DOMEventTarget</span> <span class="nx">target</span>
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<span class="nx">number</span> <span class="nx">timeStamp</span>
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<span class="nx">string</span> <span class="nx">type</span>
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</code></pre></div>
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<blockquote>
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<p>注意：</p>
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<p>React v0.14 中，事件处理程序返回 <code>false</code> 不再停止事件传播，取而代之，应该根据需要手动触发 <code>e.stopPropagation()</code> 或 <code>e.preventDefault()</code>。</p>
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</blockquote>
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<h2><a class="anchor" name=""></a>事件池 <a class="hash-link" href="#">#</a></h2>
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<p><code>SyntheticEvent</code> 是池化的. 这意味着 <code>SyntheticEvent</code> 对象将会被重用并且所有的属性都会在事件回调被调用后被 nullified.
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这是因为性能的原因.
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因此,你不能异步的访问事件.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">function</span> <span class="nx">onClick</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">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">event</span><span class="p">);</span> <span class="c1">// => nullified object.</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="nx">event</span><span class="p">.</span><span class="nx">type</span><span class="p">);</span> <span class="c1">// => "click"</span>
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<span class="kd">var</span> <span class="nx">eventType</span> <span class="o">=</span> <span class="nx">event</span><span class="p">.</span><span class="nx">type</span><span class="p">;</span> <span class="c1">// => "click"</span>
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<span class="nx">setTimeout</span><span class="p">(</span><span class="kd">function</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="nx">event</span><span class="p">.</span><span class="nx">type</span><span class="p">);</span> <span class="c1">// => null</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="nx">eventType</span><span class="p">);</span> <span class="c1">// => "click"</span>
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<span class="p">},</span> <span class="mi">0</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">clickEvent</span><span class="o">:</span> <span class="nx">event</span><span class="p">});</span> <span class="c1">// Won't work. this.state.clickEvent will only contain null values.</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">eventType</span><span class="o">:</span> <span class="nx">event</span><span class="p">.</span><span class="nx">type</span><span class="p">});</span> <span class="c1">// You can still export event properties.</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>注意:</p>
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|
||
<p>如果你想异步访问事件属性,你应该在事件上调用 <code>event.persist()</code> ,这会从池中移除合成事件并允许对事件的引用被用会保留.</p>
|
||
</blockquote>
|
||
<h2><a class="anchor" name=""></a>支持的事件 <a class="hash-link" href="#">#</a></h2>
|
||
<p>React 将事件统一化，使事件在不同浏览器上有一致的属性.</p>
|
||
|
||
<p>下面的事件处理程序在事件冒泡阶段被触发。如果要注册事件捕获处理程序，应该使用 <code>Capture</code> 事件，例如使用 <code>onClickCapture</code> 处理点击事件的捕获阶段，而不是 <code>onClick</code>。</p>
|
||
<h3><a class="anchor" name=""></a>剪贴板事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称：</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onCopy onCut onPaste
|
||
</code></pre></div>
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">DOMDataTransfer</span> <span class="nx">clipboardData</span>
|
||
</code></pre></div><h3><a class="anchor" name="composition-"></a>Composition 事件 <a class="hash-link" href="#composition-">#</a></h3>
|
||
<p>事件名称:</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onCompositionEnd onCompositionStart onCompositionUpdate
|
||
</code></pre></div>
|
||
<p>属性:</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">string</span> <span class="nx">data</span>
|
||
</code></pre></div><h3><a class="anchor" name=""></a>键盘事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称：</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onKeyDown onKeyPress onKeyUp
|
||
</code></pre></div>
|
||
<p>属性:</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">altKey</span>
|
||
<span class="nx">number</span> <span class="nx">charCode</span>
|
||
<span class="kr">boolean</span> <span class="nx">ctrlKey</span>
|
||
<span class="kr">boolean</span> <span class="nx">getModifierState</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span>
|
||
<span class="nx">string</span> <span class="nx">key</span>
|
||
<span class="nx">number</span> <span class="nx">keyCode</span>
|
||
<span class="nx">string</span> <span class="nx">locale</span>
|
||
<span class="nx">number</span> <span class="nx">location</span>
|
||
<span class="kr">boolean</span> <span class="nx">metaKey</span>
|
||
<span class="kr">boolean</span> <span class="nx">repeat</span>
|
||
<span class="kr">boolean</span> <span class="nx">shiftKey</span>
|
||
<span class="nx">number</span> <span class="nx">which</span>
|
||
</code></pre></div><h3><a class="anchor" name=""></a>焦点事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onFocus onBlur
|
||
</code></pre></div>
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">DOMEventTarget</span> <span class="nx">relatedTarget</span>
|
||
</code></pre></div>
|
||
<p>焦点事件在所有的React DOM上工作,不仅仅是表单元素.</p>
|
||
<h3><a class="anchor" name=""></a>表单事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称：</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onChange onInput onSubmit
|
||
</code></pre></div>
|
||
<p>关于 <code>onChange</code> 事件的更多信息，参见 <a href="/react/docs/forms-zh-CN.html">表单组件</a>。</p>
|
||
<h3><a class="anchor" name=""></a>鼠标事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称：</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onClick onContextMenu onDoubleClick onDrag onDragEnd onDragEnter onDragExit
|
||
onDragLeave onDragOver onDragStart onDrop onMouseDown onMouseEnter onMouseLeave
|
||
onMouseMove onMouseOut onMouseOver onMouseUp
|
||
</code></pre></div>
|
||
<p><code>onMouseEnter</code> 和 <code>onMouseLeave</code> 事件从离开的元素传播到进入的元素,代替冒泡排序并且没有捕获阶段. </p>
|
||
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">altKey</span>
|
||
<span class="nx">number</span> <span class="nx">button</span>
|
||
<span class="nx">number</span> <span class="nx">buttons</span>
|
||
<span class="nx">number</span> <span class="nx">clientX</span>
|
||
<span class="nx">number</span> <span class="nx">clientY</span>
|
||
<span class="kr">boolean</span> <span class="nx">ctrlKey</span>
|
||
<span class="kr">boolean</span> <span class="nx">getModifierState</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span>
|
||
<span class="kr">boolean</span> <span class="nx">metaKey</span>
|
||
<span class="nx">number</span> <span class="nx">pageX</span>
|
||
<span class="nx">number</span> <span class="nx">pageY</span>
|
||
<span class="nx">DOMEventTarget</span> <span class="nx">relatedTarget</span>
|
||
<span class="nx">number</span> <span class="nx">screenX</span>
|
||
<span class="nx">number</span> <span class="nx">screenY</span>
|
||
<span class="kr">boolean</span> <span class="nx">shiftKey</span>
|
||
</code></pre></div><h3><a class="anchor" name="selection-events"></a>Selection Events <a class="hash-link" href="#selection-events">#</a></h3>
|
||
<p>事件名称:</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onSelect
|
||
</code></pre></div><h3><a class="anchor" name=""></a>触控事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称：</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onTouchCancel onTouchEnd onTouchMove onTouchStart
|
||
</code></pre></div>
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">altKey</span>
|
||
<span class="nx">DOMTouchList</span> <span class="nx">changedTouches</span>
|
||
<span class="kr">boolean</span> <span class="nx">ctrlKey</span>
|
||
<span class="kr">boolean</span> <span class="nx">getModifierState</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span>
|
||
<span class="kr">boolean</span> <span class="nx">metaKey</span>
|
||
<span class="kr">boolean</span> <span class="nx">shiftKey</span>
|
||
<span class="nx">DOMTouchList</span> <span class="nx">targetTouches</span>
|
||
<span class="nx">DOMTouchList</span> <span class="nx">touches</span>
|
||
</code></pre></div><h3><a class="anchor" name=""></a>用户界面事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称：</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onScroll
|
||
</code></pre></div>
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">number</span> <span class="nx">detail</span>
|
||
<span class="nx">DOMAbstractView</span> <span class="nx">view</span>
|
||
</code></pre></div><h3><a class="anchor" name=""></a>滚轮事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称：</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onWheel
|
||
</code></pre></div>
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">number</span> <span class="nx">deltaMode</span>
|
||
<span class="nx">number</span> <span class="nx">deltaX</span>
|
||
<span class="nx">number</span> <span class="nx">deltaY</span>
|
||
<span class="nx">number</span> <span class="nx">deltaZ</span>
|
||
</code></pre></div><h3><a class="anchor" name=""></a>媒体事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称:</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onAbort onCanPlay onCanPlayThrough onDurationChange onEmptied onEncrypted onEnded onError onLoadedData onLoadedMetadata onLoadStart onPause onPlay onPlaying onProgress onRateChange onSeeked onSeeking onStalled onSuspend onTimeUpdate onVolumeChange onWaiting
|
||
</code></pre></div><h3><a class="anchor" name=""></a>图片事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称:</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onLoad onError
|
||
</code></pre></div><h3><a class="anchor" name=""></a>动画事件 <a class="hash-link" href="#">#</a></h3>
|
||
<p>事件名称:</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onAnimationStart onAnimationEnd onAnimationIteration
|
||
</code></pre></div>
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">string</span> <span class="nx">animationName</span>
|
||
<span class="nx">string</span> <span class="nx">pseudoElement</span>
|
||
<span class="kr">float</span> <span class="nx">elapsedTime</span>
|
||
</code></pre></div><h3><a class="anchor" name="transition-events"></a>Transition Events <a class="hash-link" href="#transition-events">#</a></h3>
|
||
<p>事件名称:</p>
|
||
<div class="highlight"><pre><code class="language-text" data-lang="text">onTransitionEnd
|
||
</code></pre></div>
|
||
<p>属性：</p>
|
||
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">string</span> <span class="nx">propertyName</span>
|
||
<span class="nx">string</span> <span class="nx">pseudoElement</span>
|
||
<span class="kr">float</span> <span class="nx">elapsedTime</span>
|
||
</code></pre></div>
|
||
|
||
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© 2013–2016 Facebook Inc.<br>
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