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var osm = new OpenLayers.Layer.XYZ(
"MapQuest OSM",
[
"http://otile1.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
"http://otile2.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
"http://otile3.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
"http://otile4.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png"
],
{transitionEffect: "resize", wrapDateLine: true}
);
var utfgrid = new OpenLayers.Layer.UTFGrid({
url: "utfgrid/geography-class/${z}/${x}/${y}.grid.json",
utfgridResolution: 4, // default is 2
displayInLayerSwitcher: false
});
var map = new OpenLayers.Map({
div: "map",
projection: "EPSG:900913",
numZoomLevels: 3,
layers: [osm, utfgrid],
controls: [
new OpenLayers.Control.Navigation({
dragPanOptions: {
enableKinetic: true
}
}),
new OpenLayers.Control.Zoom()
],
center: [0, 0],
zoom: 1
});
var output = document.getElementById("output");
var flag = document.getElementById("flag");
var callback = function(infoLookup, loc, pixel) {
var msg = "";
if (infoLookup) {
var info;
for (var idx in infoLookup) {
// idx can be used to retrieve layer from map.layers[idx]
info = infoLookup[idx];
if (info && info.data) {
output.innerHTML = info.data.admin;
flag.innerHTML = "<img src='data:image/png;base64," + info.data.flag_png + "'>";
flag.style.left = (pixel.x + 15) + "px";
flag.style.top = (pixel.y + 15) + "px";
} else {
output.innerHTML = flag.innerHTML = " ";
}
}
}
};
var control = new OpenLayers.Control.UTFGrid({
callback: callback,
handlerMode: "move"
});
map.addControl(control);
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