Geolocation feedback while accepting the request

Asked 2011-01-19T13:58:57.490

the geolocation implementation is quite good and got few steps to observe but only on thing is missing, i guess. Im not able to see if the user accepted the request or not ( before i get the position object ), i dunno if the user just ignores my request ( during my timeout ) or if the request just get lost ( and the failure callback doesnt get called for no reason ).

It would be useful to set a timestamp when the user accepts the request, i couldnt find anything which gives me that kind of response.

html permissions geolocation

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2 Answers

Based on my new understanding of what you are after, you want something like this. (Tested: in Opera - works, Firefox 3.6 & Chrome 8 - not so much (I need more time to debug))

Scenario: Page attempts to get location... but user ignores the prompt completely thus there is no (accept or deny) and since the request for the location is never sent, there is no timeout either!

Based on this you may want to add your own logic to handle this scenario. For the sake of this example, I'm going to prototype my own "wrapper" method. (for the picky - I'm not condoning using globals etc. I was just trying to get something to work)

navigator.geolocation.requestCurrentPosition = function(successCB, errorCB, timeoutCB, timeoutThreshold, options){
  var successHandler = successCB;
  var errorHandler = errorCB;
  window.geolocationTimeoutHandler = function(){
    timeoutCB();
  }
  if(typeof(geolocationRequestTimeoutHandler) != 'undefined'){
    clearTimeout(window['geolocationRequestTimeoutHandler']);//clear any previous timers
  }
  var timeout = timeoutThreshold || 30000;//30 seconds
  window['geolocationRequestTimeoutHandler'] = setTimeout('geolocationTimeoutHandler()', timeout);//set timeout handler
  navigator.geolocation.getCurrentPosition(
    function(position){
      clearTimeout(window['geolocationRequestTimeoutHandler']);
      successHandler(position);
    },
    function(error){
      clearTimeout(window['geolocationRequestTimeoutHandler']);
      errorHandler(error);
    },
     options
  );
};
function timeoutCallback(){
  alert('Hi there! we are trying to locate you but you have not answered the security question yet.\n\nPlease choose "Share My Location" to enable us to find you.');
}
function successCallback(position){
  var msg = '';
  msg += 'Success! you are at: ';
  msg += '\nLatitude: ' + position.coords.latitude;
  msg += '\nLongitude: ' + position.coords.longitude;
  msg += '\nAltitude: ' + position.coord


                        
                        
                            answered 2011-01-19T17:00:01.660


            
            
                
                    
                        
                            
                            
                        
                        5
                        
                            
                            
                        
                        
                    
                    
                        
                        Tested it successful in FF 3.5, Opera 10.6, Chrome8, IE6-8..

var succeed = function(obj) {
    navigator.geolocation.received = true;
    !navigator.geolocation.timedout?alert('GOT YAH'):alert('GOT YAH but user was to slow'); 
};
var failed  = function(obj) { 
    navigator.geolocation.received = true;
    !navigator.geolocation.timedout?alert('just failed'):alert('failed and user was to slow as well, tzz ._.'); 
};
var timedout    = function() {
    navigator.geolocation.timedout = true; // could be used for other callbacks to trace if its timed out or not
    !navigator.geolocation.received?alert('Request timed out'):null;    
}

// Extend geolocation object
if ( navigator.geolocation  ) {
    navigator.geolocation.retrievePermission = function retrievePermission(succeed,failed,options,timeout) {
        this.received = false;              // reference for timeout callback
        this.timedout = false;              // reference for other callbacks
        this.getCurrentPosition.apply(this,arguments);  // actual request

        // Trigger timeout with its function; default timeout offset 5000ms
        if ( timeout ) {
            setTimeout(timeout.callback,timeout.offset || 5000);
        }
    }

    // New location request with timeout callback
    navigator.geolocation.retrievePermission(succeed,failed,{},{
        offset: 10000, // miliseconds
        callback: timedout  
    });

// Awesome thingy is not implemented
} else {
    alert('geolocation is not supported');
}


With that workaround we know if the request timedout, even when the succeess / failure callback get called afterwards.

                        
                        
                            answered 2011-01-20T14:02:48.593



        
        
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