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diff --git a/files/zh-cn/web/api/document/dragstart_event/index.html b/files/zh-cn/web/api/document/dragstart_event/index.html new file mode 100644 index 0000000000..15ec167d42 --- /dev/null +++ b/files/zh-cn/web/api/document/dragstart_event/index.html @@ -0,0 +1,308 @@ +--- +title: dragstart +slug: Web/API/Document/dragstart_event +tags: + - DOM + - dragstart + - 事件 + - 拖动 +translation_of: Web/API/Document/dragstart_event +--- +<div>当用户开始拖动一个元素或者一个选择文本的时候 <code>dragstart</code> 事件就会触发。</div> + +<h2 id="基本信息">基本信息</h2> + +<table class="properties"> + <tbody> + <tr> + <td>Bubbles</td> + <td>Yes</td> + </tr> + <tr> + <td>Cancelable</td> + <td>Yes</td> + </tr> + <tr> + <td>Target objects</td> + <td>{{domxref("Document")}}, {{domxref("Element")}}</td> + </tr> + <tr> + <td>Interface</td> + <td>{{domxref("DragEvent")}}</td> + </tr> + <tr> + <td>Default Action</td> + <td>Initiate the drag-and-drop operation.</td> + </tr> + </tbody> +</table> + +<h2 id="属性">属性</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><a href="/en-US/docs/Web/API/EventTarget" title="EventTarget is an interface implemented by objects that can receive events and may have listeners for them."><code>EventTarget</code></a></td> + <td>The element that was underneath the element being dragged.</td> + </tr> + <tr> + <td><code>type</code> {{readonlyInline}}</td> + <td><a href="/en-US/docs/Web/API/DOMString" title="DOMString is a UTF-16 String. As JavaScript already uses such strings, DOMString is mapped directly to a String."><code>DOMString</code></a></td> + <td>The type of event.</td> + </tr> + <tr> + <td><code>bubbles</code> {{readonlyInline}}</td> + <td><a href="/en-US/docs/Web/API/Boolean" title="The Boolean object is an object wrapper for a boolean value."><code>Boolean</code></a></td> + <td>Whether the event normally bubbles or not</td> + </tr> + <tr> + <td><code>cancelable</code> {{readonlyInline}}</td> + <td><a href="/en-US/docs/Web/API/Boolean" title="The Boolean object is an object wrapper for a boolean value."><code>Boolean</code></a></td> + <td>Whether the event is cancellable or not?</td> + </tr> + <tr> + <td><code>view</code> {{readonlyInline}}</td> + <td><a class="new" href="/en-US/docs/Web/API/WindowProxy" rel="nofollow" title="The documentation about this has not yet been written; please consider contributing!"><code>WindowProxy</code></a></td> + <td><a href="/en-US/docs/Web/API/Document/defaultView" title="In browsers, document.defaultView returns the window object associated with a document, or null if none is available."><code>document.defaultView</code></a> (<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>dataTransfer</code></td> + <td>DataTransfer</td> + <td>The data that underlies a drag-and-drop operation, known as the <a href="/en-US/docs/Web/API/DataTransfer">drag data store</a>. Protected mode.</td> + </tr> + <tr> + <td><code>currentTarget</code> {{readonlyInline}}</td> + <td>EventTarget</td> + <td>The node that had the event listener attached.</td> + </tr> + <tr> + <td><code>relatedTarget</code> {{readonlyInline}}</td> + <td>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="示例：dropzone" name="示例：dropzone">示例：dropzone</h2> + +<h3 id="HTML_内容">HTML 内容</h3> + +<pre class="brush: html"><div class="dropzone"> + <div id="draggable" draggable="true" ondragstart="event.dataTransfer.setData('text/plain',null)"> + This div is draggable + </div> +</div> +<div class="dropzone"></div> +<div class="dropzone"></div> +<div class="dropzone"></div></pre> + +<h3 id="CSS_内容">CSS 内容</h3> + +<pre class="brush: css"> #draggable { + width: 200px; + height: 20px; + text-align: center; + background: white; + } + + .dropzone { + width: 200px; + height: 20px; + background: blueviolet; + margin-bottom: 10px; + padding: 10px; + }</pre> + +<h3 id="JavaScript_内容">JavaScript 内容</h3> + +<pre class="brush: js"> var dragged; + + /* 可拖动的目标元素会触发事件 */ + document.addEventListener("drag", function( event ) { + + }, false); + + document.addEventListener("dragstart", function( event ) { + // 保存拖动元素的引用(ref.) + dragged = event.target; + // 使其半透明 + event.target.style.opacity = .5; + }, false); + + document.addEventListener("dragend", function( event ) { + // 重置透明度 + event.target.style.opacity = ""; + }, false); + + /* 放下目标节点时触发事件 */ + document.addEventListener("dragover", function( event ) { + // 阻止默认动作 + event.preventDefault(); + }, false); + + document.addEventListener("dragenter", function( event ) { + // 当可拖动的元素进入可放置的目标高亮目标节点 + if ( event.target.className == "dropzone" ) { + event.target.style.background = "purple"; + } + + }, false); + + document.addEventListener("dragleave", function( event ) { + // 当拖动元素离开可放置目标节点，重置其背景 + if ( event.target.className == "dropzone" ) { + event.target.style.background = ""; + } + + }, false); + + document.addEventListener("drop", function( event ) { + // 阻止默认动作（如打开一些元素的链接） + event.preventDefault(); + // 移动拖动的元素到所选择的放置目标节点 + if ( event.target.className == "dropzone" ) { + event.target.style.background = ""; + dragged.parentNode.removeChild( dragged ); + event.target.appendChild( dragged ); + } + + }, false);</pre> + +<p>{{ EmbedLiveSample('示例：dropzone') }}</p> + +<h2 id="浏览器支持">浏览器支持</h2> + +<div>{{CompatibilityTable}}</div> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Firefox (Gecko)</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari (WebKit)</th> + </tr> + <tr> + <td>Basic support</td> + <td>4</td> + <td>{{CompatGeckoDesktop("1.9.1")}}</td> + <td>10</td> + <td>12</td> + <td>3.1</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Android Webview</th> + <th>Chrome for Android</th> + <th>Firefox Mobile (Gecko)</th> + <th>Firefox OS</th> + <th>IE Mobile</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatIE("10")}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + </tr> + </tbody> +</table> +</div> + +<h2 id="相关事件">相关事件</h2> + +<ul> + <li>{{event("drag")}}</li> + <li>{{event("dragstart")}}</li> + <li>{{event("dragend")}}</li> + <li>{{event("dragover")}}</li> + <li>{{event("dragenter")}}</li> + <li>{{event("dragleave")}}</li> + <li>{{event("dragexit")}}</li> + <li>{{event("drop")}}</li> +</ul> |