This API is available on Firefox OS for privileged or certified applications only.


This method attempts to focus the camera. If the camera is able to attempt to focus, a success callback is issued, regardless of whether or not the focusing attempt succeeds. If unable to attempt to focus, an error callback is performed instead.

The success or failure of the focus operation is indicated by the value of a parameter passed into the callback function.


CameraControl.autoFocus(onsuccess[, onerror]);


A callback function called when a focus attempt is made
onerror Optional
An optional callback function that accepts an error string as an input parameter; this is called if it's not possible to attempt to focus the camera.


function onFocusPossible( success ) {
  if ( success ) {
    console.log("The image has been focused");
  } else {
    console.log("The image has not been focused");

function onFocusNotPossible( error ) {
  console.log("The camera is not able to focus anything");
  console.log( error );

function onAccessCamera( camera ) {
  camera.autoFocus(onFocusPossible, onFocusNotPossible);

var options = {
  camera: navigator.mozCameras.getListOfCameras()[0]

navigator.mozCameras.getCamera(options, onAccessCamera)


Not part of any specification; however, this API should be removed when the WebRTC Capture and Stream API has been implemented.

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API B2G Camera camera Firefox OS Graphics JavaScript Method Reference Référence WebAPI