Request location coordinates after user has blocked access in javascript

问题

How can I prompt a user for their geo-location in javascript if they've blocked my request in the past? (using navigator.geolocation.getCurrentPosition).

For example, my web app requires location services, and the user accidentally clicks "block", or they change their mind. What can I do to prompt them again?

回答1:

As mentioned by @matthew-shwery, you can not change the permission.
the best you could do is check for the permission and notify the user is the permission is denied

navigator.permissions.query({
     name: 'geolocation'
 }).then(function(result) {
     if (result.state == 'granted') {
         report(result.state);
         geoBtn.style.display = 'none';
     } else if (result.state == 'prompt') {
         report(result.state);
         geoBtn.style.display = 'none';

         navigator.geolocation.getCurrentPosition(revealPosition, positionDenied, geoSettings);
     } else if (result.state == 'denied') {
         report(result.state);
         geoBtn.style.display = 'inline';
     }
     result.onchange = function() {
         report(result.state);
     }
 });

Geolocation docs

回答2:

You can't.

The user must manage their browser settings manually because your site is added to a blacklist when denied location permissions.

Here are instructions for Chrome users to manage their location permissions: https://support.google.com/chrome/answer/142065?hl=en

来源：https://stackoverflow.com/questions/42476180/request-location-coordinates-after-user-has-blocked-access-in-javascript