javascript - How to get my markers to update on a Leaflet map? -


i've created map grabs data json-source , puts marker drivers inside json-data. problem is, want these drivers position update time. so, i've created function repeats every 3 seconds. cause duplicated drivers, how markers update position, not creating one? code below, json-data doesn't work due cors.

code:

<html xmlns="http://www.w3.org/1999/xhtml"> <head>   <meta name="generator" content=   "html tidy linux/x86 (vers 25 march 2009), see www.w3.org" />    <title></title>   <meta charset="utf-8" />   <meta name="viewport" content=   "width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />   <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.5/leaflet.css" type=   "text/css" />   <script src="http://code.jquery.com/jquery-1.9.1.min.js" type="text/javascript"> </script><!--[if lte ie 8]>             <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.5/leaflet.ie.css" />         <![endif]-->    <style type="text/css"> /*<![cdata[*/             body {                 padding: 0;                 margin: 0;             }             html, body, #map {                 height: 100%;             }   /*]]>*/   </style> </head>  <body>   <div id="map"></div><script src="https://www.google.com/jsapi?.js" type=   "text/javascript"> </script><script src="http://cdn.leafletjs.com/leaflet-0.5/leaflet.js" type= "text/javascript"> </script><script src="leaflet-ajax.js" type="text/javascript"> </script><script type="text/javascript"> //<![cdata[             init(); //calls "grab location" function   function init() {     var map = l.map('map', {         center: [51.505, -0.09],         zoom: 13     }),         marker = l.marker(map.getcenter()).addto(map)             .bindpopup("<center><b>jag<\/b><\/center>").openpopup();     glcl = google.loader.clientlocation,     onlocationfound = function (e) {         marker.setlatlng(e.latlng);         map.setview(marker.getlatlng(), map.getzoom());     };      l.tilelayer('http://{s}.tile.cloudmade.com/1fa9625d371549a298938509a2eac256/997/256/{z}/{x}/{y}.png').addto(map);      map.on('locationfound', onlocationfound);      if (glcl) { //when google.loader.clientlocation contains result         onlocationfound({             latlng: [glcl.latitude, glcl.longitude]         });     } else {}     map.locate();      driversrealtime();    function driversrealtime() {    setinterval(function () {     var url = "data.json";     var name;     var img;      $.getjson(url,      function (response) {         name = response.drivers[0].name;         img = response.drivers[0].img;         (var = 0; < response.drivers.length; i++) {             var driver = response.drivers[i];             var m = l.marker(new l.latlng(driver.currentlat, driver.currentlon)).addto(map)                 .bindpopup("<center><b>" + driver.name + "<\/b><\/center>");         }     });   }, 3000); //delay millisekunder   }   }          // api-url: http://blackcab.didair.se/api/drivers   //]]>   </script> </body> </html>


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