README.md

@capacitor/motion

The Motion API tracks accelerometer and device orientation (compass heading, etc.)

Install

npm install @capacitor/motion
npx cap sync

Permissions

This plugin is currently implemented using Web APIs. Most browsers require permission before using this API. To request permission, prompt the user for permission on any user-initiated action (such as a button click):

import { PluginListenerHandle } from '@capacitor/core';
import { Motion } from '@capacitor/motion';


let accelHandler: PluginListenerHandle;

myButton.addEventListener('click', async () => {
  try {
    await DeviceMotionEvent.requestPermission();
  } catch (e) {
    // Handle error
    return;
  }

  // Once the user approves, can start listening:
  accelHandler = await Motion.addListener('accel', event => {
    console.log('Device motion event:', event);
  });
});

// Stop the acceleration listener
const stopAcceleration = () => {
  if (accelHandler) {
    accelHandler.remove();
  }
};

// Remove all listeners
const removeListeners = () => {
  Motion.removeAllListeners();
};

See the DeviceMotionEvent API to understand the data supplied in the 'accel' event.

API

• addListener('accel', ...)
• addListener('orientation', ...)
• removeAllListeners()
• Interfaces
• Type Aliases

addListener('accel', ...)

addListener(eventName: 'accel', listenerFunc: AccelListener) => Promise<PluginListenerHandle> & PluginListenerHandle

Add a listener for accelerometer data

Param	Type
eventName	'accel'
listenerFunc	AccelListener

Returns: Promise<PluginListenerHandle> & PluginListenerHandle

Since: 1.0.0

---

addListener('orientation', ...)

addListener(eventName: 'orientation', listenerFunc: OrientationListener) => Promise<PluginListenerHandle> & PluginListenerHandle

Add a listener for device orientation change (compass heading, etc.)

Param	Type
eventName	'orientation'
listenerFunc	OrientationListener

Returns: Promise<PluginListenerHandle> & PluginListenerHandle

Since: 1.0.0

---

removeAllListeners()

removeAllListeners() => Promise<void>

Remove all the listeners that are attached to this plugin.

Since: 1.0.0

---

Interfaces

PluginListenerHandle

Prop	Type
remove	() => Promise<void>

AccelListenerEvent

Prop	Type	Description	Since
acceleration	Acceleration	An object giving the acceleration of the device on the three axis X, Y and Z. Acceleration is expressed in m/s	1.0.0
accelerationIncludingGravity	Acceleration	An object giving the acceleration of the device on the three axis X, Y and Z with the effect of gravity. Acceleration is expressed in m/s	1.0.0
rotationRate	RotationRate	An object giving the rate of change of the device's orientation on the three orientation axis alpha, beta and gamma. Rotation rate is expressed in degrees per seconds.	1.0.0
interval	number	A number representing the interval of time, in milliseconds, at which data is obtained from the device.	1.0.0

Acceleration

Prop	Type	Description	Since
x	number	The amount of acceleration along the X axis.	1.0.0
y	number	The amount of acceleration along the Y axis.	1.0.0
z	number	The amount of acceleration along the Z axis.	1.0.0

RotationRate

Prop	Type	Description	Since
alpha	number	The amount of rotation around the Z axis, in degrees per second.	1.0.0
beta	number	The amount of rotation around the X axis, in degrees per second.	1.0.0
gamma	number	The amount of rotation around the Y axis, in degrees per second.	1.0.0

Type Aliases

AccelListener

(event: AccelListenerEvent): void

OrientationListener

(event: RotationRate): void

OrientationListenerEvent

RotationRate