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