GlobalEventHandlers.ondragenter

在此页

句法
范例
规范
浏览器兼容性
另请参阅
相关话题

A global event handler 为 dragenter 事件。

句法

var dragenterHandler = targetElement.ondragenter;

返回值

dragenterHandler

范例

This example demonstrates using the ondragenter attribute handler to set an element's dragenter event handler.

<!DOCTYPE html>
<html lang=en>
<title>Examples of using the Drag and Drop Global Event Attribute</title>
<meta content="width=device-width">
<style>
  div {
    margin: 0em;
    padding: 2em;
  }
  #source {
    color: blue;
    border: 1px solid black;
  }
  #target {
    border: 1px solid black;
  }
</style>
</head>
<script>
function dragstart_handler(ev) {
 console.log("dragStart");
 // Change the source element's background color to signify drag has started
 ev.currentTarget.style.border = "dashed";
 ev.dataTransfer.setData("text", ev.target.id);
}
function dragover_handler(ev) {
 console.log("dragOver");
 // Change the target element's border to signify a drag over event
 // has occurred
 ev.currentTarget.style.background = "lightblue";
 ev.preventDefault();
}
function drop_handler(ev) {
 console.log("Drop");
 ev.preventDefault();
 var data = ev.dataTransfer.getData("text");
 ev.target.appendChild(document.getElementById(data));
}
function dragenter_handler(ev) {
 console.log("dragEnter");
 // Change the source element's background color for enter events
 ev.currentTarget.style.background = "yellow";
}
function dragleave_handler(ev) {
 console.log("dragLeave");
 // Change the source element's border back to white
 ev.currentTarget.style.background = "white";
}
function dragend_handler(ev) {
 console.log("dragEnd");
 // Change the target element's background color to visually indicate
 // the drag ended.
 var el=document.getElementById("target");
 el.style.background = "pink";
}
function dragexit_handler(ev) {
 console.log("dragExit");
 // Change the source element's border back to green to signify a dragexit event
 ev.currentTarget.style.background = "green";
}
function init() {
 // Set handlers for the source's enter/leave/end/exit events
 var el=document.getElementById("source");
 el.ondragenter = dragenter_handler;
 el.ondragleave = dragleave_handler;
 el.ondragend = dragend_handler;
 el.ondragexit = dragexit_handler;
}
</script>
<body onload="init();">
<h1>Examples of <code>ondragenter</code>, <code>ondragleave</code>, <code>ondragend</code>, <code>ondragexit</code></h1>
 <div>
   <p id="source" ondragstart="dragstart_handler(event);" draggable="true">
     Select this element, drag it to the Drop Zone and then release the selection to move the element.</p>
 </div>
 <div id="target" ondrop="drop_handler(event);" ondragover="dragover_handler(event);">Drop Zone</div>
</body>
</html>

规范

规范	状态	注释
HTML 实时标准 The definition of 'ondragenter' in that specification.	实时标准
HTML 5.1 The definition of 'ondragenter' in that specification.	推荐	初始定义

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`ondragenter`	Chrome 4	Edge 12	Firefox 3.5	IE 10	Opera 12	Safari 3.1	WebView Android No	Chrome Android No	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android No

图例

完整支持
不支持

另请参阅

dragenter

元数据

最后修改： 2019 年 3 月 23 日

在此页

句法

返回值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题