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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

DataTransferItem() getter method implements support for accessing items in the DataTransferItemList using array-style syntax (that is DataTransferItem [ index ] ).

句法

dataItem = DataTransferItem[index];
					

参数

index

The zero-based index of the item in the drag data list to return.

返回值

DataTransferItem object at the specified index in the item list. If the index is less than zero or greater than or equal to the number of items in the list (as indicated by the list's length property, undefined is returned. The returned value is never null .

范例

This example shows how to use drag and drop.

JavaScript

function dragstart_handler(ev) {
  console.log("dragStart");
  // Add this element's id to the drag payload so the drop handler will
  // know which element to add to its tree
  var dataList = ev.dataTransfer.items;
  dataList.add(ev.target.id, "text/plain");
  // Add some other items to the drag payload
  dataList.add("<p>... paragraph ...</p>", "text/html");
  dataList.add("http://www.example.org","text/uri-list");
}
function drop_handler(ev) {
  console.log("Drop");
  ev.preventDefault();
  var data = ev.dataTransfer.items;
  // Loop through the dropped items and log their data
  for (var i = 0; i < data.length; i++) {
    if ((data[i].kind == 'string') && (data[i].type.match('^text/plain'))) {
      // This item is the target node
      data[i].getAsString(function (s){
        ev.target.appendChild(document.getElementById(s));
      });
    } else if ((data[i].kind == 'string') && (data[i].type.match('^text/html'))) {
      // Drag data item is HTML
      data[i].getAsString(function (s){
        console.log("... Drop: HTML = " + s);
      });
    } else if ((data[i].kind == 'string') && (data[i].type.match('^text/uri-list'))) {
      // Drag data item is URI
      data[i].getAsString(function (s){
        console.log("... Drop: URI = " + s);
      });
    }
  }
}
function dragover_handler(ev) {
  console.log("dragOver");
  ev.preventDefault();
  // Set the dropEffect to move
  ev.dataTransfer.dropEffect = "move"
}
function dragend_handler(ev) {
  console.log("dragEnd");
  var dataList = ev.dataTransfer.items;
  // Clear any remaining drag data
  dataList.clear();
}
					

HTML

<div>
  <p id="source" ondragstart="dragstart_handler(event);" ondragend="dragend_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>
					

CSS

div {
  margin: 0em;
  padding: 2em;
}
#source {
  color: blue;
  border: 1px solid black;
}
#target {
  border: 1px solid black;
}
					

结果

Drag and Drop demo link

规范

规范	状态	注释
HTML 实时标准 The definition of 'DataTransferItem getter' in that specification.	实时标准

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
DataTransferItemList[]	Chrome 13	Edge ≤79	Firefox 50	IE No	Opera 12	Safari 6	WebView Android 4.4	Chrome Android 18	Firefox Android 50	Opera Android No	Safari iOS 6	Samsung Internet Android 1.0

图例

完整支持

完整支持

不支持

不支持

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. HTML 拖放 API
2. DataTransferItemList
3. 特性

   1. length
4. 方法

   1. add()
   2. clear()
   3. DataTransferItem()
   4. remove()
5. Related pages for HTML Drag and Drop API

   1. DataTransfer
   2. DataTransferItem
   3. DragEvent