javascript - How set the current position center on the map? -

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i tried different approaches found on site , in web don't work me(

this code:

<h:panelgroup id="gmwrapper" style="background-color: red">    <p:gmap widgetvar="mainmap" center="49.835, 24.0083" zoom="15"            id="maingooglemap" type="hybrid"            style="width: 600px; height: 400px" model="#{userplaces.model}"            styleclass="gmappstyle" onpointclick="handlepointclick(event)" />    <p:commandbutton onclick="somefunc()"></p:commandbutton>    <script type="text/javascript">      function somefunc() {        if (navigator.geolocation) {          alert("start")          navigator.geolocation          .getcurrentposition(success);          alert("successful!")          var elem = document          .getelementbyid("maingooglemap");          alert("element find")          elem.setcenter(new google.maps.latlng(37.4419, -122.1419));          alert("good done!");        } else {          error('geo location not supported');          currentlat = 0.0;          currentlng = 0.0;        }      }        var currentlat;      var currentlng;        function success(position) {        currentlat = position.coords.latitude;        currentlng = position.coords.longitude;      }    </script>  </h:panelgroup>

javascript code works alert("element find")

also tried:

elem.setattribute("center", currentlat.tostring() + ", " + currentlng.tostring()); elem.setattribute("center", currentlat + ", " + currentlng); elem.setattribute("center", "37.4419, -122.1419"); , few other..

from google maps docs: panto(latlng:latlng|latlngliteral) - changes center of map given latlng. if change less both width , height of map, transition smoothly animated. below snippet creates map , centers map @ location.

<!doctype html>  <html>    <head>      <title>simple map</title>      <meta name="viewport" content="initial-scale=1.0, user-scalable=no">      <meta charset="utf-8">      <style>        html, body, #map-canvas {          height: 100%;          margin: 0px;          padding: 0px        }      </style>      <script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>      <script>  var map;  function initialize() {    var mapoptions = {      zoom: 8,      center: new google.maps.latlng(-34.397, 150.644)    };    map = new google.maps.map(document.getelementbyid('map-canvas'),        mapoptions);    map.panto(new google.maps.latlng(37.4419, -122.1419));  }    google.maps.event.adddomlistener(window, 'load', initialize);        </script>    </head>    <body>      <div id="map-canvas"></div>    </body>  </html>


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