如何获取JavaScript中被拖动元素的ID？ [英] How to get the id of the dragged element in javascript?
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问题描述
我想在放置事件处理程序的 javascript 中获取被拖动元素的ID。
I want to get the id of the dragged element in javascript in the drop event handler.
div ID为place5的div可与
div with id place5 is draggable with drop location being another div with id dropArea.
在放置事件处理程序中，如何获取div（place5）的ID？
In the drop event handler how to get the id of div(place5)?
<html>
<head>
<style>
.mainArea{
width: 500px;
height : 500px;
border-color:red;
border-style:solid;
border-width:5px;
}
</style>
<script>
function dragEventHandler(theEvent) {
theEvent.dataTransfer.setData("Text", theEvent.target.id);
//Some code here.
}
function dropEventHandler(theEvent) {
//how to get the id of div with id "place5" here?
}
</script>
</head>
<body>
<div id="dropArea" class="mainArea" ondrop="dropEventHandler(event);" ondragover="event.preventDefault();>
</div>
<div id="place5" draggable="true" ondragstart="dragEventHandler(event);">
</div>
</body>
</html>
推荐答案
执行与拖动开始事件相反的操作。
Perform the reverse of what you did during the drag start event.
因此，在dragstart上，您将：
So on dragstart you have:
function dragEventHandler(theEvent) {
theEvent.dataTransfer.setData("Text", theEvent.target.id);
//Some code here.
}
因此，在拖放时您将拥有：
Thus on drop you would have:
function dropEventHandler(theEvent) {
var id = theEvent.dataTransfer.getData("Text");
//Other code here.
}
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