Element.requestPointerLock()

options Optional

An options object that can contain the following properties:

unadjustedMovement Optional

Disables OS-level adjustment for mouse acceleration, and accesses raw mouse input instead. The default value is false; setting it to true will disable mouse acceleration.

A Promise that resolves with undefined.

Pointer lock is often used in online games, when you want your mouse movement to be focused on controlling the game, without the distraction of the mouse pointer moving around, going outside the game area, or reaching the edge of the window.

To enable pointer lock, you would get the user to interact with the UI in some way, perhaps by pressing a button, or the game canvas itself.

canvas.addEventListener("click", async () => {
  await canvas.requestPointerLock();
});

Operating systems enable mouse acceleration by default, which is useful when you sometimes want slow precise movement (think about you might use a graphics package), but also want to move great distances with a faster mouse movement (think about scrolling, and selecting several files). For some first-person perspective games however, raw mouse input data is preferred for controlling camera rotation — where the same distance movement, fast or slow, results in the same rotation. This results in a better gaming experience and higher accuracy, according to professional gamers.

To disable OS-level mouse acceleration and access raw mouse input, you can set the unadjustedMovement to true:

canvas.addEventListener("click", async () => {
  await canvas.requestPointerLock({
    unadjustedMovement: true,
  });
});

For more example code, see:

• pointer lock demo (see source code)
• Pointer Lock API
• Disable mouse acceleration to provide a better FPS gaming experience

Transient user activation is required. The user has to interact with the page or a UI element in order for this feature to work.

• Document.pointerLockElement
• Document.exitPointerLock()
• Pointer Lock