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I have a map on the link below:
http://gis.xyz/openlayers/openlayer.html The map works well, however there is one thing what is frustrating me. When I load the page and the first thing what I try to do on the map is pan the map window change to white and the coordinates change to NaN, NaN. If I start with zoom in or out the map and the pan function work as well. Is there anybody who can provide me a solution?

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Make sure that your view center coordinates and zoom level are numbers. Currently they are strings (sometimes empty strings even), which leads to unexpected behavior. Something like

var zoomy = parseFloat(getParameterByName('zoomy') || 0);
var laty = parseFloat(getParameterByName('laty') || 0);
var lony = parseFloat(getParameterByName('lony') || 0);

Also make sure that your view center coordinates are in EPSG:3857 and x, y order. If it was your intention to use latitude and longitude (as your variable names suggest), then you'll have to change your view configuration:

view: new ol.View({
    center: ol.proj.transform([lony, laty], 'EPSG:4326', 'EPSG:3857'),
    zoom: zoomy
});
  • I changed them to numbers and it solved the problem. Thank you. – Tamas Kosa Feb 4 '15 at 9:39

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