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---
title: UIEvent
slug: Web/API/UIEvent
tags:
- API
translation_of: Web/API/UIEvent
---
<p>{{APIRef("DOM Events")}}</p>
<p>The <strong><code>UIEvent</code></strong> interface represents simple user interface events.</p>
<p><code>UIEvent</code> derives from {{domxref("Event")}}. Though the {{domxref("UIEvent.initUIEvent()")}} method is kept for backward compatibility, creating of a <code>UIEvent</code> object should be done using the {{domxref("UIEvent.UIEvent", "UIEvent()")}} constructor.</p>
<p>Several interfaces are direct or indirect descendants of this one: {{domxref("MouseEvent")}}, {{domxref("FocusEvent")}}, {{domxref("KeyboardEvent")}}, {{domxref("WheelEvent")}}, {{domxref("InputEvent")}}, and {{domxref("CompositionEvent")}}.</p>
<h2 id="Constructors">Constructors</h2>
<dl>
<dt>{{domxref("UIEvent.UIEvent()", "UIEvent()")}}</dt>
<dd>Creates a <code>UIEvent</code> object.</dd>
</dl>
<h2 id="Properties">Properties</h2>
<p><em>This interface also inherits properties of its parent, {{domxref("Event")}}.</em></p>
<dl>
<dt>{{domxref("UIEvent.cancelBubble")}} {{Deprecated_inline}}{{Non-standard_inline}}</dt>
<dd>Is a {{jsxref("Boolean")}} indicating whether the bubbling of the event has been canceled or not.</dd>
</dl>
<dl>
<dt>{{domxref("UIEvent.detail")}}{{readonlyinline}}</dt>
<dd>Returns a <code>long</code> that gives some detail about the event, depending on the type of event.</dd>
<dt>{{domxref("UIEvent.isChar")}} {{Non-standard_inline}} {{readonlyinline}}</dt>
<dd>Returns a {{jsxref("Boolean")}} indicating whether the event produced a key character or not.</dd>
<dt>{{domxref("UIEvent.layerX")}} {{Non-standard_inline}} {{readonlyinline}}</dt>
<dd>Returns the horizontal coordinate of the event relative to the current layer.</dd>
<dt>{{domxref("UIEvent.layerY")}} {{Non-standard_inline}} {{readonlyinline}}</dt>
<dd>Returns the vertical coordinate of the event relative to the current layer.</dd>
<dt>{{domxref("UIEvent.pageX")}} {{Non-standard_inline}} {{readonlyinline}}</dt>
<dd>Returns the horizontal coordinate of the event relative to the whole document.</dd>
<dt>{{domxref("UIEvent.pageY")}} {{Non-standard_inline}} {{readonlyinline}}</dt>
<dd>Returns the vertical coordinate of the event relative to the whole document.</dd>
<dt>{{domxref("UIEvent.view")}}{{readonlyinline}}</dt>
<dd>Returns a {{domxref("WindowProxy")}} that contains the view that generated the event.</dd>
<dt>{{domxref("UIEvent.which")}} {{Non-standard_inline}} {{readonlyinline}}</dt>
<dd>Returns the numeric <code>keyCode</code> of the key pressed, or the character code (<code>charCode</code>) for an alphanumeric key pressed.</dd>
</dl>
<h2 id="Methods">Methods</h2>
<p><em>This interface also inherits methods of its parent, {{domxref("Event")}}.</em></p>
<dl>
<dt>{{domxref("UIEvent.initUIEvent()")}} {{deprecated_inline}}</dt>
<dd>Initializes a <code>UIEvent</code> object. If the event has already being dispatched, this method does nothing.</dd>
</dl>
<h2 id="Specifications">Specifications</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('DOM3 Events', '#interface-UIEvent', 'UIEvent')}}</td>
<td>{{Spec2('DOM3 Events')}}</td>
<td>From {{SpecName('DOM2 Events')}}:
<ul>
<li>added the <code>UIEvent()</code> constructor,</li>
<li>deprecated the <code>initUIEvent()</code> method,</li>
<li>and changed the type of <code>view</code> from <code>AbstractView</code> to <code>WindowProxy</code>.</li>
</ul>
</td>
</tr>
<tr>
<td>{{SpecName('DOM2 Events', '#Events-UIEvent', 'UIEvent')}}</td>
<td>{{Spec2('DOM2 Events')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility" name="Browser_compatibility">Browser compatibility</h2>
{{Compat("api.UIEvent")}}
<h2 class="editable" id="See_also"><span>See also</span></h2>
<ul>
<li>{{ domxref("Event") }}</li>
</ul>
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