检查用户设备的GPS是否已打开

Question

I am developing an app using jQuery Mobile with PHP. I am not using Phonegap or other frameworks. I need to find user's geolocation. If user device's GPS is off, then I cant get a location. now I need to find user device's GPS is on or off.

this is what i using now.

function getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(showPosition);
  } else { 
    x.innerHTML = "Geolocation is not supported by this browser.";
  }
}

function showPosition(position) {
  var lat=position.coords.latitude;
  var long=position.coords.longitude;
}

Answer 1

You can call this function on load

      // Function to get location
      function getLocation(){
          navigator.geolocation.getCurrentPosition(function (pos) {
              var lat = pos.coords.latitude;
              var lng = pos.coords.longitude;
              if (lat == null) {
                  alert("GPS not activated!");
              } else {
                  alert("Latitude: "+ lat + " , Longitude: " + lng );
              }
          });
      }