javascript - marker disappears after setPosition on google maps -


i worked on gps position show on google maps. issue here google mark appears on first time (set google marker part). disappeard every time after setposition method called. appreciated.

<!doctype html> <html> <head> <script src="http://maps.google.com/maps/api/js?sensor=false"> </script> <script type="text/javascript">     var index=0;     var latitudes = new array(35.71434,35.715612,35.711779,35.70913,35.710646);     var longitudes = new array(-77.92854,-77.924076,-77.925171,-77.925943,-77.930278);     var mapoptions;     var coords = new google.maps.latlng(latitudes[index],longitudes[index]);     var marker = null;     var map;     var newpoint;      function autoupdate(){         navigator.geolocation.getcurrentposition(function(position){             mapoptions = {                 zoom: 15,                 center: coords,                 maptypecontrol: true,                 navigationcontroloptions: {                     style: google.maps.navigationcontrolstyle.small                 },                 maptypeid: google.maps.maptypeid.roadmap             };             map = new google.maps.map(                 document.getelementbyid("mapcontainer"), mapoptions             );             if(marker){                 newpoint = new google.maps.latlng(latitudes[index],longitudes[index]);                 marker.setposition(newpoint);             }                else{                 marker = new google.maps.marker({                     position: coords,                     map: map,                 });             }             if(newpoint!=null){                 map.setcenter(newpoint);                 marker.setvisible(true);             }         });          index=index+1;         if(index==5){             index=0;         }         settimeout(autoupdate,5000);     }      autoupdate(); </script> <style type="text/css"> #mapcontainer {     height: 500px;     width: 800px;     border:10px solid #eaeaea; } </style> </head> <body>     <div id="mapcontainer"></div> </body> </html>

thank help.

move code creates map out of autoupdate function, run once on page load:

        mapoptions = {             zoom: 15,             center: coords,             maptypecontrol: true,             navigationcontroloptions: {                 style: google.maps.navigationcontrolstyle.small             },             maptypeid: google.maps.maptypeid.roadmap         };         map = new google.maps.map(             document.getelementbyid("mapcontainer"), mapoptions         );

or similar marker, create once, if has been initialized/created, change center.


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