Test if html5 geolocation permission already has been granted

Question

Does anyone know if there is a way to test if prior html5 geolocation permission has been granted?

I try to make a script that does not request the geolocation unles

Answer 1

The first part actually answers your question, at least on Chrome 43+ and Firefox 46+ (see https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API):

navigator.permissions &&
navigator.permissions.query({name: 'geolocation'}).then(function(PermissionStatus) {
    if('granted' === PermissionStatus.state) {
        navigator.geolocation.getCurrentPosition(function(geoposition) {
            console.log(geoposition) /* You can use this position without prompting the user if the permission had already been granted */
        })
    }
})