The inputreport event of the HIDDevice interface fires when a new report is received from the HID device.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("inputreport", (event) => {});

oninputreport = (event) => {};

An HIDInputReportEvent. Inherits from Event.

This interface also inherits properties from Event.

HIDInputReportEvent.data Read only

A DataView containing the data from the input report, excluding the reportId if the HID interface uses report IDs.

HIDInputReportEvent.device Read only

The HIDDevice instance that represents the HID interface that sent the input report.

HIDInputReportEvent.reportId Read only

The one-byte identification prefix for this report, or 0 if the HID interface does not use report IDs.

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

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]}.`);
});