javascript - Why this code update every 13 second? -


just experimenting measuring distances via geolocation, script auto update every 13 seconds on galaxy s3 wonder part of script trigger timing update, how make update quicker every second .

window.onload = function () {     var startpos;      if (navigator.geolocation) {         navigator.geolocation.getcurrentposition(function (position) {             startpos = position;             document.getelementbyid("startlat").innerhtml = startpos.coords.latitude;             document.getelementbyid("startlon").innerhtml = startpos.coords.longitude;         }, function (error) {             alert("error occurred. error code: " + error.code);             // error.code can be:             //   0: unknown error             //   1: permission denied             //   2: position unavailable (error response locaton provider)             //   3: timed out         });          navigator.geolocation.watchposition(function (position) {             document.getelementbyid("currentlat").innerhtml = position.coords.latitude;             document.getelementbyid("currentlon").innerhtml = position.coords.longitude;             document.getelementbyid("distance").innerhtml = calculatedistance(startpos.coords.latitude, startpos.coords.longitude,             position.coords.latitude, position.coords.longitude);         });     } };  // reused code - copyright moveable type scripts - retrieved may 4, 2010. // http://www.movable-type.co.uk/scripts/latlong.html // under creative commons license http://creativecommons.org/licenses/by/3.0/ function calculatedistance(lat1, lon1, lat2, lon2) {     var r = 6371; // km     var dlat = (lat2 - lat1).torad();     var dlon = (lon2 - lon1).torad();     var = math.sin(dlat / 2) * math.sin(dlat / 2) + math.cos(lat1.torad()) * math.cos(lat2.torad()) * math.sin(dlon / 2) * math.sin(dlon / 2);     var c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a));     var d = r * c;     return d; } number.prototype.torad = function () {     return * math.pi / 180; }

view whole code here

this isn't possible current api. see documentation here

the geolocation.watchposition() method used register handler function called automatically each time position of device changes. can also, optionally, specify error handling callback function.

emphasis mine.

you not need poll the location every second, should notify when location has changed automatically.

you should able enable highaccuracy mode give best possible results:

options = {   enablehighaccuracy: true, };  id = navigator.geolocation.watchposition(success, error, options);

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