[OpenLayers-Users] Refresh marker without refreshing whole map

Mon Jan 25 17:05:16 EST 2010

Hi,   i am currently using OS Open Space which i believe is similer to  
Open Layers.

I am currenty displaying a map with a marker. However my marker  
coordinates can change whilst the user is viewing the map so i would  
like the Marker code to refresh and re-plot the marker every 10  
seconds however i cannot work out how to do this. I have tried adding  
aHTML refresh command <meta http-equiv="refresh" content="10"> causes  
the whole map to refresh.

I tried creating a refresh function that calls the marker function i  
created that plots the marker as shown below. however the marker looks  
like it refreshes as the marker flashes every 10 seconds however it  
does not replot if the coordinates if they have changed. Does anyone  
have any suggestions for refreshing a function within javascript?

Thanks for any help in advance my code is below

<script type="text/javascript">

var osMap;

function init()
{
osMap = new OpenSpace.Map('map');

osMap.setCenter(new OpenSpace.MapPoint(439300, 114760), 8);

}

function refresh()

{

setInterval('marker()', 10000);

}

function marker()
{

var markers = new OpenLayers.Layer.Markers("Markers");
osMap.addLayer(markers);

// Default icon
var pos = new OpenSpace.MapPoint(438760, 114760);
var marker = new OpenLayers.Marker(pos);

markers.addMarker(marker);
}

</script>
</head>
<body onload="init(); refresh()">

Thanks for any help in advance

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