Files
openlayers/examples/utfgrid.html
2012-02-26 19:23:22 -07:00

138 lines
4.5 KiB
HTML

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>OpenLayers UTFGrid Demo</title>
<link rel="stylesheet" href="style.css" type="text/css">
<script src="../lib/OpenLayers.js"></script>
<style>
#attrsdiv {
float: right;
}
#controlToggle li { list-style: none; }
</style>
</head>
<body>
<h1 id="title">OpenLayers UTFGrid Demo</h1>
<div>
<div id="shortdesc">
This page demonstrates the use of the OpenLayers UTFGrid Controls.
</div>
<div id="attrsdiv"></div>
<div id="themap" class="smallmap"></div>
<p>
When the selected event is triggered, the underlying feature attributes are shown below.
</p>
<ul id="controlToggle">
<li>
<input type="radio" name="type" value="move" id="moveHandler"
onclick="toggleControl(this);" checked="checked" />
<label for="moveHandler">Move</label>
</li>
<li>
<input type="radio" name="type" value="hover" id="hoverHandler"
onclick="toggleControl(this);" />
<label for="hoverHandler">Hover</label>
</li>
<li>
<input type="radio" name="type" value="click" id="clickHandler"
onclick="toggleControl(this);" />
<label for="clickHandler">Click</label>
</li>
</ul>
</div>
<div id="docs">
<p><a href="http://mapbox.com/mbtiles-spec/utfgrid/">UTFGrids</a> can be used to
output highly optimized feature "hit grids". The UTFGrid encoding scheme encodes
interactivity data for a tile in a space efficient manner. It is designed to be
used in browsers for interactive features like displaying tooltips without
having to hit the server for an "info query".
</p>
<p>
For more info, view the
<a href="https://github.com/mapbox/utfgrid-spec"> UTFGrid Specification</a>
or check out the <a href="http://mapbox.com/demo/visiblemap/">Visible Map Demo</a>
(implemented in Wax and ModestMaps).
</p>
</div>
<script>
/*
* Map
*/
var map = new OpenLayers.Map({
div: "themap",
projection: "EPSG:900913",
controls: [] // No default controls; no pan zoom for demo
});
/*
* Controls
*/
var callback = function(dataLookup) {
var msg = "";
if (dataLookup) {
var data;
for (var idx in dataLookup) {
// idx can be used to retrieve layer from map.layers[idx]
data = dataLookup[idx];
if (data) {
msg += "<strong>In 2005, " + data.NAME + " had a population of " +
data.POP2005 + " people.</strong> ";
}
}
}
document.getElementById("attrsdiv").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'
})
};
var control;
for(var key in controls) {
control = controls[key];
control.deactivate();
map.addControl(control);
}
controls['move'].activate();
function toggleControl(el) {
for(var c in controls) {
control = controls[c];
control.deactivate();
}
control = controls[el.value];
control.activate();
}
/*
* Layers
*/
var osm = new OpenLayers.Layer.OSM();
map.addLayer(osm);
var grid_layer = new OpenLayers.Layer.UTFGrid(
'Invisible UTFGrid Layer',
"./utfgrid/world_utfgrid/${z}/${x}/${y}.json"
);
map.addLayer(grid_layer);
map.zoomTo(1);
</script>
</body>
</html>