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var osm = new OpenLayers.Layer.OSM();
var utfgrid = new OpenLayers.Layer.UTFGrid({
url: "utfgrid/world_utfgrid/${z}/${x}/${y}.json",
utfgridResolution: 4, // default is 2
displayInLayerSwitcher: false
});
var map = new OpenLayers.Map({
div: "map",
projection: "EPSG:900913",
controls: [],
layers: [osm, utfgrid],
center: [0, 0],
zoom: 1
});
var callback = function(infoLookup) {
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) {
msg += "[" + info.id + "] <strong>In 2005, " +
info.data.NAME + " had a population of " +
info.data.POP2005 + " people.</strong> ";
}
}
}
document.getElementById("attrs").innerHTML = msg;
};
var controls = {
move: new OpenLayers.Control.UTFGrid({
callback: callback,
handlerMode: "move"
}),
hover: new OpenLayers.Control.UTFGrid({
callback: callback,
handlerMode: "hover"
}),
click: new OpenLayers.Control.UTFGrid({
callback: callback,
handlerMode: "click"
})
};
for (var key in controls) {
map.addControl(controls[key]);
}
function toggleControl(el) {
for (var c in controls) {
controls[c].deactivate();
}
controls[el.value].activate();
}
// activate the control that responds to mousemove
toggleControl({value: "move"});
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