XRSession.cancelAnimationFrame() - Web APIs 编辑

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The cancelAnimationFrame() method of the XRSession interface cancels an animation frame which was previously requested by calling requestAnimationFrame.

Syntax

xrSession.cancelAnimationFrame(handle);

Parameters

handle

The unique value returned by the call to requestAnimationFrame() that previously scheduled the animation callback.

Return value

None.

Usage notes

This function has no effect if the specified handle cannot be found.

Example

In the example below we see code which starts up a WebXR session if immersive VR mode is supported. Once started, the session schedules its first frame to be rendered by calling requestAnimationFrame().

The pauseXR() function shown at the bottom can be called to suspend the WebVR session, in essence, by canceling any pending animation frame callback. Since each frame callback schedules the next one, removing the callback terminates updating of the WebXR scene.

const XR = navigator.xr;

let requestHandle = null;
let xrSession = null;

if (XR) {
  XR.isSessionSupported('immersive-vr')
  .then((isSupported) => {
    if (isSupported) {
      startXR();
    }
  });
}

function frameCallback(time, xrFrame) {
  xrSession.requestAnimationFrame(frameCallback);

  // Update and render the frame
}

async function startXR() {
  xrSession = XR.requestSession("immersive-vr");

  if (xrSession) {
    stopButton.onclick = stopXR;
    requestHandle = xrSession.requestAnimationFrame(frameCallback);
  }
}

function pauseXR() {
  if (xrSession && requestHandle) {
    xrSession.cancelAnimationFrame(requestHandle);
    requestHandle = null;
  }
}

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Window.cancelAnimationFrame
• XRSession.requestAnimationFrame