DataTransfer.items
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
DataTransfer的items 属性只读，是拖动操作中 数据传输项的列表。该列表包含了操作中每一项目的对应项，如果操作没有项目，则列表为空。
语法
itemList = dataTransfer.items;
返回值
一个DataTransferItemList 对象，包含了表示拖动操作中被拖动项的DataTransferItem对象，每一个拖动项对应一个列表项。如果拖动操作中没有数据，则列表为空。
示例
这个例子演示了 items 和 types 属性的用法。
js
<!DOCTYPE html>
<html lang=en>
<title>Examples of DataTransfer.{types,items} properties</title>
<meta content="width=device-width">
<style>
div {
margin: 0em;
padding: 2em;
}
#target {
border: 1px solid black;
}
</style>
<script>
function dragstart_handler(ev) {
console.log("dragStart: target.id = " + ev.target.id);
// Add this element's id to the drag payload so the drop handler will
// know which element to add to its tree
ev.dataTransfer.setData("text/plain", ev.target.id);
ev.dataTransfer.effectAllowed = "move";
}
function drop_handler(ev) {
console.log("drop: target.id = " + ev.target.id);
ev.preventDefault();
// Get the id of the target and add the moved element to the target's DOM
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
// Print each format type
if (ev.dataTransfer.types != null) {
for (var i=0; i < ev.dataTransfer.types.length; i++) {
console.log("... types[" + i + "] = " + ev.dataTransfer.types[i]);
}
}
// Print each item's "kind" and "type"
if (ev.dataTransfer.items != null) {
for (var i=0; i < ev.dataTransfer.items.length; i++) {
console.log("... items[" + i + "].kind = " + ev.dataTransfer.items[i].kind + " ; type = " + ev.dataTransfer.items[i].type);
}
}
}
function dragover_handler(ev) {
console.log("dragOver");
ev.preventDefault();
// Set the dropEffect to move
ev.dataTransfer.dropEffect = "move"
}
</script>
<body>
<h1>Examples of <code>DataTransfer</code>.{<code>types</code>, <code>items</code>} properties</h1>
<ul>
<li id="i1" ondragstart="dragstart_handler(event);" draggable="true">Drag Item 1 to the Drop Zone</li>
<li id="i2" ondragstart="dragstart_handler(event);" draggable="true">Drag Item 2 to the Drop Zone</li>
</ul>
<div id="target" ondrop="drop_handler(event);" ondragover="dragover_handler(event);">Drop Zone</div>
</body>
</html>
规范
| Specification |
|---|
| HTML # dom-datatransfer-items-dev |