HIDDevice: open() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Note: This feature is available in Web Workers.
The open()
method of the HIDDevice
interface requests that the operating system opens the HID device.
Note:
HID devices are not opened automatically. Therefore, a HIDDevice
returned by HID.requestDevice()
must be opened with this method before it is available to transfer data.
Syntax
open()
Parameters
None.
Return value
A Promise
that resolves with undefined
once the connection is opened.
Exceptions
InvalidStateError
DOMException
-
Thrown if the connection is already open.
NotAllowedError
DOMException
-
Thrown if the attempt to open the connection fails for any reason.
Examples
In the following example, we wait for the HID connection to open before attempting to send or receive data.
await device.open();
Specifications
Specification |
---|
WebHID API # dom-hiddevice-open |
Browser compatibility
BCD tables only load in the browser