WakeLock.request() - Web APIs 编辑

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Secure context

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

The request() method of the WakeLock interface returns a Promise that resolves with a WakeLockSentinel object, which allows control over screen dimming and locking.

Syntax

var wakeLock = navigator.wakeLock.request(type);

Parameters

type

Options are as follows:

• 'screen': Requests a screen wake lock. Prevents devices from dimming or locking the screen.

Return value

A Promise that resolves with a WakeLockSentinel object.

Exceptions

NotAllowedError

Thrown when wake lock is not available, which can happen because:

• Document is not allowed to use screen wake lock due to screen-wake-lock policy.
• Document is not fully active.
• Document is hidden.
• User Agent could not acquire platform's wake lock.

Examples

The following asynchronous function requests a WakeLockSentinel object. The request() method is wrapped in a try...catch statement to account for if the browser refuses the request for any reason.

const requestWakeLock = async () => {
  try {

    const wakeLock = await navigator.wakeLock.request('screen');

  } catch (err) {
    // the wake lock request fails - usually system related, such low as battery

    console.log(`${err.name}, ${err.message}`);
  }
}

requestWakeLock();

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• WakeLock
• Navigator.wakeLock