HIDDevice

The HIDDevice interface of the WebHID API represents a HID Device. It provides properties for accessing information about the device, methods for opening and closing the connection, and the sending and receiving of reports.

This interface also inherits properties from EventTarget.

HIDDevice.openedRead only

Returns a boolean, true if the device has an open connection.

HIDDevice.vendorIdRead only

Returns the vendorId of the HID device.

HIDDevice.productIdRead only

Returns the productID of the HID device.

HIDDevice.productNameRead only

Returns a string containing the product name of the HID device.

HIDDevice.collectionsRead only

Returns an array of report formats for the HID device.

inputreport

Fires when a report is sent from the device.

This interface also inherits methods from EventTarget.

HIDDevice.open()

Opens a connection to this HID device, and returns a Promise which resolves once the connection has been successful.

HIDDevice.close()

Closes the connection to this HID device, and returns a Promise which resolves once the connection has been closed.

HIDDevice.sendReport()

Sends an output report to this HID Device, and returns a Promise which resolves once the report has been sent.

HIDDevice.sendFeatureReport()

Sends a feature report to this HID device, and returns a Promise which resolves once the report has been sent.

HIDDevice.receiveFeatureReport()

Receives a feature report from this HID device in the form of a Promise which resolves with a DataView. This allows typed access to the contents of this message.

The following example demonstrates listening for an inputreport event that will allow the application to detect which button is pressed on a Joy-Con Right device.

device.addEventListener("inputreport", event => {
  const { data, device, reportId } = event;

  // Handle only the Joy-Con Right device and a specific report ID.
  if (device.productId !== 0x2007 && reportId !== 0x3f) return;

  const value = data.getUint8(0);
  if (value === 0) return;

  const someButtons = { 1: "A", 2: "X", 4: "B", 8: "Y" };
  console.log(`User pressed button ${someButtons[value]}.`);
});

In the following example sendFeatureReport is used to make a device blink.

const reportId = 1;
for (let i = 0; i < 10; i++) {
  // Turn off
  await device.sendFeatureReport(reportId, Uint32Array.from([0, 0]));
  await waitFor(100);
  // Turn on
  await device.sendFeatureReport(reportId, Uint32Array.from([512, 0]));
  await waitFor(100);
}

You can see more examples, and live demos in the article Connecting to uncommon HID devices.