dragend - Web API 接口参考 编辑

拖放事件在拖放操作结束时触发(通过释放鼠标按钮或单击escape键)。

基本信息

Bubbles	Yes
Cancelable	No
Target objects	Document, Element
Interface	DragEvent
Default Action	Varies.

属性

Property	Type	Description
target 只读	EventTarget	The element that was underneath the element being dragged.
type 只读	DOMString	事件类型。
bubbles 只读	Boolean	是否允许冒泡
cancelable 只读	Boolean	默认行为是否可以取消
view 只读	WindowProxy	document.defaultView (window of the document)
detail 只读	long (float)	0.
dataTransfer	DataTransfer	The data that underlies a drag-and-drop operation, known as the drag data store. Protected mode.
currentTarget 只读	EventTarget	绑定事件监听的DOM结点
relatedTarget 只读	EventTarget	For mouseover, mouseout, mouseenter and mouseleave events: the target of the complementary event (the mouseleave target in the case of a mouseenter event). null otherwise.
screenX 只读	long	The X coordinate of the mouse pointer in global (screen) coordinates.
screenY 只读	long	The Y coordinate of the mouse pointer in global (screen) coordinates.
clientX 只读	long	The X coordinate of the mouse pointer in local (DOM content) coordinates.
clientY 只读	long	The Y coordinate of the mouse pointer in local (DOM content) coordinates.
button 只读	unsigned short	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.
buttons 只读	unsigned short	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). More info.
mozPressure 只读	float	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).
ctrlKey 只读	boolean	当事件触发的时候，如果Ctrl键是按下的，这个值就是true,否则就是false
shiftKey 只读	boolean	当事件触发的时候，如果Shift键是按下的，这个值就是true,否则就是false
altKey 只读	boolean	当事件触发的时候，如果Alt键是按下的，这个值就是true,否则就是false
metaKey 只读	boolean	当事件触发的时候，如果Meta键是按下的，这个值就是true,否则就是false

示例：dropzone

HTML 内容

<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>

CSS 内容

  #draggable {
    width: 200px;
    height: 20px;
    text-align: center;
    background: white;
  }

  .dropzone {
    width: 200px;
    height: 20px;
    background: blueviolet;
    margin-bottom: 10px;
    padding: 10px;
  }

JavaScript 内容

  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);

规范

Specification	Status	Comment
HTML Living Standard dragend	Living Standard
HTML 5.1 dragend	Recommendation	Initial definition

浏览器支持

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	4	3.5 (1.9.1)[1]	10	12	3.1

Feature	Android	Android Webview	Chrome for Android	Firefox Mobile (Gecko)	Firefox OS	IE Mobile	Opera Mobile	Safari Mobile
Basic support	未实现	未实现	未实现	未实现	未实现	10	未实现	未实现

[1] In Gecko, dragend is not dispatched if the source node is moved or removed during the drag (e.g. on drop or dragover). See bug 460801.

相关

• drag
• dragstart
• dragend
• dragover
• dragenter
• dragleave
• dragexit
• drop