InputDeviceCapabilities API

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The InputDeviceCapabilities API provides details about the underlying sources of input events. The API attempts to describe how the device behaves rather than what it is. For example, the first version of the API indicates whether a device fires touch events rather than whether it is a touch screen.

Input device capabilities concepts and usage

Because DOM events abstract device input, they provide no way to learn what device or type of device fired an event. This can lead to instances where the same action triggers multiple event handlers.  To deal with this, developers make assumptions and use heuristics to normalize behavior on web pages. 

The InputDeviceCapabilities API addresses this problem by abstracting the capabilities of input devices. For example, let's say we have a web page that implements both a touchstart and a mousedown event. We can assume that if the touchstart event is triggered that the user's device has a touch interface.  What about when the mousedown event is triggered? It would be useful to know if a touchstart event were also triggered so that we don't take the same action twice. We can do this by checking the sourceCapabilities property of the UIEvent.

myButton.addEventListener('mousedown', function(e) {
  // Touch event case handled above, don't change the style again on tap.
  if (!e.sourceCapabilities.firesTouchEvents)
    myButton.classList.add("pressed");
});

Interfaces

InputDeviceCapabilities
Provides logical information about an input device.

Specifications

Specification Status Comment
InputDeviceCapabilities Editor's Draft Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 47 ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 47 ? ? ? ? ? 47

Document Tags and Contributors

 Contributors to this page: chanthygithup, jpmedley
 Last updated by: chanthygithup,