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diff --git a/files/pt-br/web/api/element/mouseenter_event/index.html b/files/pt-br/web/api/element/mouseenter_event/index.html new file mode 100644 index 0000000000..881958914b --- /dev/null +++ b/files/pt-br/web/api/element/mouseenter_event/index.html @@ -0,0 +1,314 @@ +--- +title: mouseenter +slug: Web/API/Element/mouseenter_event +translation_of: Web/API/Element/mouseenter_event +--- +<div>{{APIRef}}</div> + +<p>O evento <code>mouseenter</code> é disparado quando um dispositivo de apontamento (geralmente um mouse) se move sobre um elemento (para dentro do mesmo).</p> + +<p>Similar ao {{event('mouseover')}}, ele se diferencia no fato de que não ocorre a fase <a href="/en-US/docs/Web/API/Event/bubbles">bubble</a> e não é disparado quando o cursor / apontador mover-se do espaço físico de um de seus descendentes para o seu próprio espaço físico.</p> + +<div style="-moz-column-width: 455px; -webkit-column-width: 455px; column-width: 455px; border: solid 1px; padding: 5px; margin-bottom: 10px;"> +<div style="text-align: center;"><img alt="mouseenter.png" class="default internal" src="/@api/deki/files/5908/=mouseenter.png"></div> +Um evento <code>mouseenter</code> é enviado para cada elemento da hierarquia ao entrar neles. Aqui 4 eventos são enviados aos quatro elementos da hierarquia quando o cursor / apontador chega no Text. + +<div style="text-align: center;"><img alt="mouseover.png" class="default internal" src="/@api/deki/files/5909/=mouseover.png"></div> +Um único evento <code>mouseover</code> é enviado ao elemento de maior profundidade na árvore DOM, a partir do qual ocorre a fase bubble e o mesmo percorre subindo na hierarquia dos elementos até que seja cancelado por um <em>handler</em> ou alcance a raíz da árvore.</div> + +<p>De acordo com a profundidade da hierarquia, a quantidade de eventos <code>mouseenter</code> disparados pode se tornar muito grande e causar problemas de performance significativos. Nestes casos é melhor escutar por eventos mouseover.</p> + +<p>Combinado ao comportamento do seu evento simétrico, <code>mouseleave</code>, o evento DOM <code>mouseenter</code> age de modo bastante similar à pseudo-classe CSS {{cssxref(':hover')}}.</p> + +<h2 id="Informações_Gerais">Informações Gerais</h2> + +<dl> + <dt style="float: left; text-align: right; width: 120px;">Especificação</dt> + <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.w3.org/TR/DOM-Level-3-Events/#event-type-mouseenter">DOM L3</a></dd> + <dt style="float: left; text-align: right; width: 120px;">Interface</dt> + <dd style="margin: 0 0 0 120px;">{{domxref('MouseEvent')}}</dd> + <dt style="float: left; text-align: right; width: 120px;">Sincronismo</dt> + <dd style="margin: 0 0 0 120px;">Síncrono</dd> + <dt style="float: left; text-align: right; width: 120px;">Fase Bubble</dt> + <dd style="margin: 0 0 0 120px;">Não</dd> + <dt style="float: left; text-align: right; width: 120px;">Cancelável</dt> + <dd style="margin: 0 0 0 120px;">Não</dd> + <dt style="float: left; text-align: right; width: 120px;">Target</dt> + <dd style="margin: 0 0 0 120px;">Element</dd> + <dt style="float: left; text-align: right; width: 120px;">Ação Padrão</dt> + <dd style="margin: 0 0 0 120px;">Nenhuma</dd> +</dl> + +<h2 id="Propriedades">Propriedades</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Property</th> + <th scope="col">Type</th> + <th scope="col">Description</th> + </tr> + </thead> + <tbody> + <tr> + <td><code>target</code> {{readonlyInline}}</td> + <td>{{domxref("EventTarget")}}</td> + <td>The event target (the topmost target in the DOM tree).</td> + </tr> + <tr> + <td><code>type</code> {{readonlyInline}}</td> + <td>{{domxref("DOMString")}}</td> + <td>The type of event.</td> + </tr> + <tr> + <td><code>bubbles</code> {{readonlyInline}}</td> + <td>Boolean</td> + <td>Whether the event normally bubbles or not</td> + </tr> + <tr> + <td><code>cancelable</code> {{readonlyInline}}</td> + <td><code>Boolean</code></td> + <td>Whether the event is cancellable or not?</td> + </tr> + <tr> + <td><code>view</code> {{readonlyInline}}</td> + <td>{{domxref("WindowProxy")}}</td> + <td>{{domxref("document.defaultView")}} (<code>window</code> of the document)</td> + </tr> + <tr> + <td><code>detail</code> {{readonlyInline}}</td> + <td><code>long</code> (<code>float</code>)</td> + <td>0.</td> + </tr> + <tr> + <td><code>currentTarget</code> {{readonlyInline}}</td> + <td>{{domxref("EventTarget")}}</td> + <td>The node that had the event listener attached.</td> + </tr> + <tr> + <td><code>relatedTarget</code> {{readonlyInline}}</td> + <td>{{domxref("EventTarget")}}</td> + <td>For <code>mouseover</code>, <code>mouseout</code>, <code>mouseenter</code> and <code>mouseleave</code> events: the target of the complementary event (the <code>mouseleave</code> target in the case of a <code>mouseenter</code> event). <code>null</code> otherwise.</td> + </tr> + <tr> + <td><code>screenX</code> {{readonlyInline}}</td> + <td>long</td> + <td>The X coordinate of the mouse pointer in global (screen) coordinates.</td> + </tr> + <tr> + <td><code>screenY</code> {{readonlyInline}}</td> + <td>long</td> + <td>The Y coordinate of the mouse pointer in global (screen) coordinates.</td> + </tr> + <tr> + <td><code>clientX</code> {{readonlyInline}}</td> + <td>long</td> + <td>The X coordinate of the mouse pointer in local (DOM content) coordinates.</td> + </tr> + <tr> + <td><code>clientY</code> {{readonlyInline}}</td> + <td>long</td> + <td>The Y coordinate of the mouse pointer in local (DOM content) coordinates.</td> + </tr> + <tr> + <td><code>button</code> {{readonlyInline}}</td> + <td>unsigned short</td> + <td>The button number that was pressed when the mouse event was fired: Left button=0, middle button=1 (if present), right button=2. For mice configured for left handed use in which the button actions are reversed the values are instead read from right to left.</td> + </tr> + <tr> + <td><code>buttons</code> {{readonlyInline}}</td> + <td>unsigned short</td> + <td>The buttons being pressed when the mouse event was fired: Left button=1, Right button=2, Middle (wheel) button=4, 4th button (typically, "Browser Back" button)=8, 5th button (typically, "Browser Forward" button)=16. If two or more buttons are pressed, returns the logical sum of the values. E.g., if Left button and Right button are pressed, returns 3 (=1 | 2). <a href="/en-US/docs/Web/API/MouseEvent">More info</a>.</td> + </tr> + <tr> + <td><code>mozPressure</code> {{readonlyInline}}</td> + <td>float</td> + <td>The amount of pressure applied to a touch or tabdevice when generating the event; this value ranges between 0.0 (minimum pressure) and 1.0 (maximum pressure).</td> + </tr> + <tr> + <td><code>ctrlKey</code> {{readonlyInline}}</td> + <td>boolean</td> + <td><code>true</code> if the control key was down when the event was fired. <code>false</code> otherwise.</td> + </tr> + <tr> + <td><code>shiftKey</code> {{readonlyInline}}</td> + <td>boolean</td> + <td><code>true</code> if the shift key was down when the event was fired. <code>false</code> otherwise.</td> + </tr> + <tr> + <td><code>altKey</code> {{readonlyInline}}</td> + <td>boolean</td> + <td><code>true</code> if the alt key was down when the event was fired. <code>false</code> otherwise.</td> + </tr> + <tr> + <td><code>metaKey</code> {{readonlyInline}}</td> + <td>boolean</td> + <td><code>true</code> if the meta key was down when the event was fired. <code>false</code> otherwise.</td> + </tr> + </tbody> +</table> + +<h2 id="Examples">Examples</h2> + +<p>The <a href="/en-US/docs/Web/Events/mouseover#Example"><code>mouseover</code> </a>documentation has an example illustrating the difference between <code>mouseover</code> and <code>mouseenter</code>.</p> + +<p>The following example illustrates how to use <code>mouseover</code> to simulate the principle of event delegation for the mouseenter event.</p> + +<pre class="brush: html"><ul id="test"> + <li> + <ul class="enter-sensitive"> + <li>item 1-1</li> + <li>item 1-2</li> + </ul> + </li> + <li> + <ul class="enter-sensitive"> + <li>item 2-1</li> + <li>item 2-2</li> + </ul> + </li> +</ul> + +<script> + var delegationSelector = ".enter-sensitive"; + + document.getElementById("test").addEventListener("mouseover", function( event ) { + var target = event.target, + related = event.relatedTarget, + match; + + // search for a parent node matching the delegation selector + while ( target && target != document && !( match = matches( target, delegationSelector ) ) ) { + target = target.parentNode; + } + + // exit if no matching node has been found + if ( !match ) { return; } + + // loop through the parent of the related target to make sure that it's not a child of the target + while ( related && related != target && related != document ) { + related = related.parentNode; + } + + // exit if this is the case + if ( related == target ) { return; } + + // the "delegated mouseenter" handler can now be executed + // change the color of the text + target.style.color = "orange"; + // reset the color after a small amount of time + setTimeout(function() { + target.style.color = ""; + }, 500); + + + }, false); + + + // function used to check if a DOM element matches a given selector + // the following code can be replaced by this IE8 compatible function: https://gist.github.com/2851541 + function matches( elem, selector ){ + // the matchesSelector is prefixed in most (if not all) browsers + return elem.matchesSelector( selector ); + }; +</script></pre> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<p>{{CompatibilityTable}}</p> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Edge</th> + <th>Firefox (Gecko)</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari</th> + </tr> + <tr> + <td>Basic support</td> + <td>30<sup>[1]</sup></td> + <td>{{CompatVersionUnknown}}</td> + <td>10<sup>[2]</sup></td> + <td>5.5</td> + <td>{{CompatVersionUnknown}}<br> + {{CompatNo}} 15.0<br> + 17.0</td> + <td>7<sup>[3]</sup></td> + </tr> + <tr> + <td>On disabled form elements</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatGeckoDesktop("44.0")}}<sup>[4]</sup></td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Chrome for Android</th> + <th>Edge</th> + <th>Firefox Mobile (Gecko)</th> + <th>IE Mobile</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + <tr> + <td>On disabled form elements</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<p>[1] Implemented in <a href="https://crbug.com/236215">bug 236215</a>.</p> + +<p>[2] Implemented in {{bug("432698")}}.</p> + +<p>[3] Safari 7 fires the event in many situations where it's not allowed to, making the whole event useless. See <a href="https://crbug.com/470258">bug 470258</a> for the description of the bug (it existed in old Chrome versions as well). Safari 8 has correct behavior</p> + +<p>[4] Implemented in {{bug("218093")}}.</p> + +<h2 id="See_also">See also</h2> + +<ul> + <li>{{Event("mousedown")}}</li> + <li>{{Event("mouseup")}}</li> + <li>{{Event("mousemove")}}</li> + <li>{{Event("click")}}</li> + <li>{{Event("dblclick")}}</li> + <li>{{Event("mouseover")}}</li> + <li>{{Event("mouseout")}}</li> + <li>{{Event("mouseenter")}}</li> + <li>{{Event("mouseleave")}}</li> + <li>{{Event("contextmenu")}}</li> +</ul> |