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GlobalEventHandlers.ondragenter - Web APIs 编辑

A global event handler for the dragenter event.

Syntax

var dragenterHandler = targetElement.ondragenter;

Return value

dragenterHandler: The dragenter event handler for element targetElement.

Example

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>

Specifications

Specification	Status	Comment
HTML Living Standard The definition of 'ondragenter' in that specification.	Living Standard
HTML 5.1 The definition of 'ondragenter' in that specification.	Recommendation	Initial definition

Browser compatibility

BCD tables only load in the browser

GlobalEventHandlers.ondragenter - Web APIs 编辑

Syntax

Return value

Example

Specifications

Browser compatibility

See also

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友情链接

GlobalEventHandlers.ondragenter - Web APIs 编辑

Syntax

Return value

Example

Specifications

Browser compatibility

See also

如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

词条统计

友情链接

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。