Chrome Permissions

[Kira Corbin]

I'm want to create a pop-up message to the user to allow permissions for NFC reader to be read from a webpage.

I have Javascript code written and linked to the html, but no pop-up is activated. 

I'm not getting the pop up to fire, I want to get it working on all browsers and smart phones.

These are my console log errors.

Uncaught ReferenceError: NDEFReader is not defined at permissions.js:73

permissions.js:17 Uncaught (in promise) TypeError: Failed to execute 'query' on 'Permissions': GenericSensorExtraClasses flag is not enabled.

    at checkPermission (permissions.js:17)

    at permissions.js:36

/client/client.ed17b3c8.js:1 Failed to load resource: the server responded with a status of 404 (Not Found)

permissions.js:45 [Deprecation] getCurrentPosition() and watchPosition() no longer work on insecure origins. To use this feature, you should consider switching your application to a secure origin, such as HTTPS. See https://goo.gl/rStTGz for more details.

requestGeolocation @ permissions.js:45

Here is my code:

// make permissions request work

// state of permissions: granted, denied, prompt

// Status of a permission

if ('permissions' in navigator) {

    var logTarget = document.getElementById('logTarget');

    function handleChange(permissionName, newState) {

        var timeBadge = new Date().toTimeString().split(' ')[0];

        var newStateInfo = document.createElement('p');

        newStateInfo.innerHTML = '' + timeBadge + ' State of ' + permissionName + ' permission status changed to ' + newState + '.';

        logTarget.appendChild(newStateInfo);

    }

    function checkPermission(permissionName, descriptor) {

        try {

            navigator.permissions.query(Object.assign({ name: permissionName }, descriptor))

                .then(function (permission) {

                    document.getElementById(permissionName + '-status').innerHTML = permission.state;

                    permission.addEventListener('change', function (e) {

                        document.getElementById(permissionName + '-status').innerHTML = permission.state;

                        handleChange(permissionName, permission.state);

                    });

                });

        } catch (e) {

        }

    }

    checkPermission('geolocation');

    checkPermission('notifications');

    checkPermission('push', { userVisibleOnly: true });

    checkPermission('midi', { sysex: true });

    checkPermission('camera');

    checkPermission('microphone');

    checkPermission('background-sync');

    checkPermission('ambient-light-sensor');

    checkPermission('accelerometer');

    checkPermission('gyroscope');

    checkPermission('magnetometer');

    var noop = function () { };

    navigator.getUserMedia = (navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia);

    function requestGeolocation() {

        navigator.geolocation.getCurrentPosition(noop);

    }

    function requestNotifications() {

        Notification.requestPermission();

    }

    function requestPush() {

        navigator.serviceWorker.getRegistration()

            .then(function (serviceWorkerRegistration) {

                serviceWorkerRegistration.pushManager.subscribe();

            });

    }

    function requestMidi() {

        navigator.requestMIDIAccess({ sysex: true });

    }

    function requestCamera() {

        navigator.getUserMedia({ video: true }, noop, noop)

    }

    function requestMicrophone() {

        navigator.getUserMedia({ audio: true }, noop, noop)

    }

}

// API glimpse

const reader = new NDEFReader()

// Creates an object used for NDEF readings.

    reader.scan(options)

//   Returns a Promise resolved if starting NFC scan was successful.

    reader.addEventListener('reading', listener)

// An event fired when a new reading is available.

    reader.addEventListener('error', listener)

// An event fired when an error happened during reading.

const writer = new NDEFWriter()

// Creates an object used for NDEF writings.

    writer.write(message, options)

//   Returns a Promise resolved if writing the message(String, ArrayBuffer or NDEF record) with options was successful.

[Derek Schuff]

Hi Kira,

This mailing list is for discussion of Native Client specifically, so this post about general JS and permissions is off-topic (and you aren't really reaching the right set of experts in any case). Offhand I don't know of any other mailing lists that are meant for webNFC, but there is the W3C community group (https://www.w3.org/community/web-nfc/) and of course the obvious.

-Derek

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