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Dan Abramov
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648 lines
26 KiB
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/reference-events.md" target="_blank">Edit on GitHub</a>
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<h1>
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SyntheticEvent
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</h1>
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<div class="subHeader"></div>
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<p>This reference guide documents the <code>SyntheticEvent</code> wrapper that forms part of React's Event System. See the <a href="/react/docs/handling-events.html">Handling Events</a> guide to learn more.</p>
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<h2>Overview</h2>
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<p>Your event handlers will be passed instances of <code>SyntheticEvent</code>, a cross-browser wrapper around the browser's native event. It has the same interface as the browser's native event, including <code>stopPropagation()</code> and <code>preventDefault()</code>, except the events work identically across all browsers.</p>
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<p>If you find that you need the underlying browser event for some reason, simply use the <code>nativeEvent</code> attribute to get it. Every <code>SyntheticEvent</code> object has the following attributes:</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>Note:</p>
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<p>As of v0.14, returning <code>false</code> from an event handler will no longer stop event propagation. Instead, <code>e.stopPropagation()</code> or <code>e.preventDefault()</code> should be triggered manually, as appropriate.</p>
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</blockquote>
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<h3>Event Pooling</h3>
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<p>The <code>SyntheticEvent</code> is pooled. This means that the <code>SyntheticEvent</code> object will be reused and all properties will be nullified after the event callback has been invoked.
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This is for performance reasons.
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As such, you cannot access the event in an asynchronous way.</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="kr">const</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="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">clickEvent</span><span class="o">:</span> <span class="nx">event</span><span class="p">});</span>
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<span class="c1">// You can still export event properties.</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>
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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>If you want to access the event properties in an asynchronous way, you should call <code>event.persist()</code> on the event, which will remove the synthetic event from the pool and allow references to the event to be retained by user code.</p>
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</blockquote>
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<h2>Supported Events</h2>
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<p>React normalizes events so that they have consistent properties across different browsers.</p>
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<p>The event handlers below are triggered by an event in the bubbling phase. To register an event handler for the capture phase, append <code>Capture</code> to the event name; for example, instead of using <code>onClick</code>, you would use <code>onClickCapture</code> to handle the click event in the capture phase.</p>
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<ul>
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<li><a href="#clipboard-events">Clipboard Events</a></li>
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<li><a href="#composition-events">Composition Events</a></li>
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<li><a href="#keyboard-events">Keyboard Events</a></li>
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<li><a href="#focus-events">Focus Events</a></li>
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<li><a href="#form-events">Form Events</a></li>
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<li><a href="#mouse-events">Mouse Events</a></li>
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<li><a href="#selection-events">Selection Events</a></li>
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<li><a href="#touch-events">Touch Events</a></li>
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<li><a href="#ui-events">UI Events</a></li>
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<li><a href="#wheel-events">Wheel Events</a></li>
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<li><a href="#media-events">Media Events</a></li>
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<li><a href="#image-events">Image Events</a></li>
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<li><a href="#animation-events">Animation Events</a></li>
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<li><a href="#transition-events">Transition Events</a></li>
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</ul>
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<hr>
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<h2>Reference</h2>
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<h3>Clipboard Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onCopy onCut onPaste
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">DOMDataTransfer</span> <span class="nx">clipboardData</span>
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</code></pre></div>
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<hr>
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<h3>Composition Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onCompositionEnd onCompositionStart onCompositionUpdate
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">string</span> <span class="nx">data</span>
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</code></pre></div>
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<hr>
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<h3>Keyboard Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onKeyDown onKeyPress onKeyUp
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">altKey</span>
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<span class="nx">number</span> <span class="nx">charCode</span>
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<span class="kr">boolean</span> <span class="nx">ctrlKey</span>
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<span class="kr">boolean</span> <span class="nx">getModifierState</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span>
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<span class="nx">string</span> <span class="nx">key</span>
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<span class="nx">number</span> <span class="nx">keyCode</span>
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<span class="nx">string</span> <span class="nx">locale</span>
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<span class="nx">number</span> <span class="nx">location</span>
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<span class="kr">boolean</span> <span class="nx">metaKey</span>
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<span class="kr">boolean</span> <span class="nx">repeat</span>
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<span class="kr">boolean</span> <span class="nx">shiftKey</span>
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<span class="nx">number</span> <span class="nx">which</span>
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</code></pre></div>
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<hr>
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<h3>Focus Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onFocus onBlur
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</code></pre></div>
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<p>These focus events work on all elements in the React DOM, not just form elements.</p>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">DOMEventTarget</span> <span class="nx">relatedTarget</span>
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</code></pre></div>
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<hr>
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<h3>Form Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onChange onInput onSubmit
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</code></pre></div>
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<p>For more information about the onChange event, see <a href="/react/docs/forms.html">Forms</a>.</p>
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<hr>
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<h3>Mouse Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onClick onContextMenu onDoubleClick onDrag onDragEnd onDragEnter onDragExit
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onDragLeave onDragOver onDragStart onDrop onMouseDown onMouseEnter onMouseLeave
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onMouseMove onMouseOut onMouseOver onMouseUp
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</code></pre></div>
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<p>The <code>onMouseEnter</code> and <code>onMouseLeave</code> events propagate from the element being left to the one being entered instead of ordinary bubbling and do not have a capture phase.</p>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">altKey</span>
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<span class="nx">number</span> <span class="nx">button</span>
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<span class="nx">number</span> <span class="nx">buttons</span>
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<span class="nx">number</span> <span class="nx">clientX</span>
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<span class="nx">number</span> <span class="nx">clientY</span>
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<span class="kr">boolean</span> <span class="nx">ctrlKey</span>
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<span class="kr">boolean</span> <span class="nx">getModifierState</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span>
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<span class="kr">boolean</span> <span class="nx">metaKey</span>
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<span class="nx">number</span> <span class="nx">pageX</span>
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<span class="nx">number</span> <span class="nx">pageY</span>
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<span class="nx">DOMEventTarget</span> <span class="nx">relatedTarget</span>
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<span class="nx">number</span> <span class="nx">screenX</span>
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<span class="nx">number</span> <span class="nx">screenY</span>
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<span class="kr">boolean</span> <span class="nx">shiftKey</span>
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</code></pre></div>
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<hr>
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<h3>Selection Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onSelect
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</code></pre></div>
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<hr>
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<h3>Touch Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onTouchCancel onTouchEnd onTouchMove onTouchStart
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">altKey</span>
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<span class="nx">DOMTouchList</span> <span class="nx">changedTouches</span>
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<span class="kr">boolean</span> <span class="nx">ctrlKey</span>
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<span class="kr">boolean</span> <span class="nx">getModifierState</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span>
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<span class="kr">boolean</span> <span class="nx">metaKey</span>
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<span class="kr">boolean</span> <span class="nx">shiftKey</span>
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<span class="nx">DOMTouchList</span> <span class="nx">targetTouches</span>
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<span class="nx">DOMTouchList</span> <span class="nx">touches</span>
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</code></pre></div>
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<hr>
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<h3>UI Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onScroll
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">number</span> <span class="nx">detail</span>
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<span class="nx">DOMAbstractView</span> <span class="nx">view</span>
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</code></pre></div>
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<hr>
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<h3>Wheel Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onWheel
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">number</span> <span class="nx">deltaMode</span>
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<span class="nx">number</span> <span class="nx">deltaX</span>
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<span class="nx">number</span> <span class="nx">deltaY</span>
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<span class="nx">number</span> <span class="nx">deltaZ</span>
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</code></pre></div>
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<hr>
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<h3>Media Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onAbort onCanPlay onCanPlayThrough onDurationChange onEmptied onEncrypted
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onEnded onError onLoadedData onLoadedMetadata onLoadStart onPause onPlay
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onPlaying onProgress onRateChange onSeeked onSeeking onStalled onSuspend
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onTimeUpdate onVolumeChange onWaiting
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</code></pre></div>
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<hr>
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<h3>Image Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onLoad onError
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</code></pre></div>
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<hr>
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<h3>Animation Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onAnimationStart onAnimationEnd onAnimationIteration
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">string</span> <span class="nx">animationName</span>
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<span class="nx">string</span> <span class="nx">pseudoElement</span>
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<span class="kr">float</span> <span class="nx">elapsedTime</span>
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</code></pre></div>
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<hr>
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<h3>Transition Events</h3>
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<p>Event names:</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">onTransitionEnd
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</code></pre></div>
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<p>Properties:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">string</span> <span class="nx">propertyName</span>
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<span class="nx">string</span> <span class="nx">pseudoElement</span>
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<span class="kr">float</span> <span class="nx">elapsedTime</span>
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</code></pre></div>
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