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The DataTransfer.types
read-only property is an array of the drag data formats (as strings
) that were set in the dragstart
event. The order of the formats is the same order as the data included in the drag operation.
The formats are Unicode strings giving the type or format of the data, generally given by a MIME type. Some values that are not MIME types are special-cased for legacy reasons (for example "text
").
Syntax
dataTransfer.types;
Return value
An array of the data formats used in the drag operation. Each format is string
. If the drag operation included no data, this list will be empty. If any files are included in the drag operation, then one of the types will be the string Files
.
Example
This example shows the use of the types
and items
properties.
<!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>
Specifications
Specification | Status | Comment |
---|---|---|
WHATWG HTML Living Standard The definition of 'types' in that specification. |
Living Standard | |
HTML5.1 The definition of 'types' in that specification. |
Working Draft | Initial definition |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 4 | 3.5 | 10 | 12 | 3.1 |
Feature | Android | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|---|
Basic support | No support | No support | No support | No support | No support | 10 | No support | No support |