javascript - Google Maps API: Combining Directions Service with watchPosition Geolocation -


i'm trying display map using google's directions service origin, destination, , blue directions line connecting two. however, trying use watchposition origin lat/lng.

so far displays correctly, except green origin marker doesn't move watchposition updates new lat/lng coordinates. i'm trying possible? or have create third marker follows user's coordinates?

here have in script:

    var directionsdisplay;     var directionsservice = new google.maps.directionsservice();     var map;      function initialize() {       directionsdisplay = new google.maps.directionsrenderer();       var mapoptions = {         zoom:7,         center: new google.maps.latlng(38.5815719, -121.4943996)       }       map = new google.maps.map(document.getelementbyid('map-canvas'), mapoptions);       directionsdisplay.setmap(map);       calcroute(); }  function handlenogeolocation(errorflag) {   if (errorflag) {     var content = 'error: geolocation service failed.'; } else {     var content = 'error: browser doesn\'t support geolocation.'; }    var options = {     map: map,     position: new google.maps.latlng(<%= @order.origin_lat %>, <%= @order.origin_lng %>),     content: content   };    var infowindow = new google.maps.infowindow(options);   map.setcenter(options.position); }    function calcroute() {     if(navigator.geolocation) {         navigator.geolocation.watchposition(function(position) {             var pos = new google.maps.latlng(position.coords.latitude, position.coords.longitude);             var request = {                   origin: pos,                   destination: new google.maps.latlng(<%= @order.user.latitude %>, <%= @order.user.longitude %>),                   travelmode: google.maps.travelmode.driving               };             directionsservice.route(request, function(response, status) {             if (status == google.maps.directionsstatus.ok) {                   directionsdisplay.setdirections(response);                 }             });         },          function() {         handlenogeolocation(true);         });     } else {     // browser doesn't support geolocation         handlenogeolocation(false);     }  }  google.maps.event.adddomlistener(window, 'load', initialize);

it doesn't accomplishable in mobile web, created third marker moves according user's position.


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