2012-08-07 22:45:47 +08:00
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<!DOCTYPE html>
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<html>
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<head>
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<title>Leaflet Layers Control Example</title>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link rel="stylesheet" href="../dist/leaflet.css" />
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<!--[if lte IE 8]><link rel="stylesheet" href="../dist/leaflet.ie.css" /><![endif]-->
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<style>
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#map {
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width: 800px;
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height: 500px;
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}
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.info {
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padding: 6px 8px;
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font: 14px/16px Arial, Helvetica, sans-serif;
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background: white;
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background: rgba(255,255,255,0.8);
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box-shadow: 0 0 15px rgba(0,0,0,0.2);
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border-radius: 5px;
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}
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.info h4 {
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margin: 0 0 5px;
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color: #777;
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}
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.legend {
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text-align: left;
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line-height: 18px;
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color: #555;
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}
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.legend i {
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width: 18px;
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height: 18px;
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float: left;
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margin-right: 8px;
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opacity: 0.7;
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}
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</style>
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</head>
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<body>
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<div id="map"></div>
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<script src="../dist/leaflet.js"></script>
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<script type="text/javascript" src="us-states.js"></script>
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<script type="text/javascript">
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var map = L.map('map').setView([37.8, -96], 4);
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var cloudmade = L.tileLayer('http://{s}.tile.cloudmade.com/{key}/{styleId}/256/{z}/{x}/{y}.png', {
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attribution: 'Map data © 2011 OpenStreetMap contributors, Imagery © 2011 CloudMade',
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key: 'BC9A493B41014CAABB98F0471D759707',
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styleId: 22677
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}).addTo(map);
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// control that shows state info on hover
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var info = L.control();
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info.onAdd = function (map) {
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this._div = L.DomUtil.create('div', 'info');
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this.update();
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return this._div;
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};
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info.update = function (props) {
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this._div.innerHTML = '<h4>US Population Density</h4>' + (props ?
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'<b>' + props.name + '</b><br />' + props.density + ' people / mi<sup>2</sup>'
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: 'Hover over a state');
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};
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info.addTo(map);
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// get color depending on population density value
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function getColor(d) {
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return d > 1000 ? '#800026' :
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d > 500 ? '#BD0026' :
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d > 200 ? '#E31A1C' :
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d > 100 ? '#FC4E2A' :
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d > 50 ? '#FD8D3C' :
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d > 20 ? '#FEB24C' :
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d > 10 ? '#FED976' :
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'#FFEDA0';
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}
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function style(feature) {
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return {
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weight: 2,
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opacity: 1,
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color: 'white',
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dashArray: '3',
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fillOpacity: 0.7,
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fillColor: getColor(feature.properties.density)
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};
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}
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function highlightFeature(e) {
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var layer = e.target;
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2012-08-08 17:22:27 +08:00
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layer.setStyle({
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2012-08-07 22:45:47 +08:00
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weight: 5,
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color: '#666',
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dashArray: '',
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fillOpacity: 0.7
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});
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2012-08-08 19:05:39 +08:00
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if (!L.Browser.ie && !L.Browser.opera) {
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2012-08-08 17:22:27 +08:00
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layer.bringToFront();
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}
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2012-08-07 22:45:47 +08:00
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info.update(layer.feature.properties);
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}
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var geojson;
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function resetHighlight(e) {
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geojson.resetStyle(e.target);
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info.update();
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}
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function zoomToFeature(e) {
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map.fitBounds(e.target.getBounds());
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}
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function onEachFeature(feature, layer) {
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layer.on({
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mouseover: highlightFeature,
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mouseout: resetHighlight,
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click: zoomToFeature
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});
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}
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geojson = L.geoJson(statesData, {
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style: style,
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onEachFeature: onEachFeature
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}).addTo(map);
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map.attributionControl.addAttribution('Population data © <a href="http://census.gov/">US Census Bureau</a>');
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var legend = L.control({position: 'bottomright'});
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legend.onAdd = function (map) {
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var div = L.DomUtil.create('div', 'info legend'),
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grades = [0, 10, 20, 50, 100, 200, 500, 1000],
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labels = [],
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from, to;
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for (var i = 0; i < grades.length; i++) {
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from = grades[i];
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to = grades[i + 1];
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labels.push(
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'<i style="background:' + getColor(from + 1) + '"></i> ' +
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from + (to ? '–' + to : '+'));
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}
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div.innerHTML = labels.join('<br>');
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return div;
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};
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legend.addTo(map);
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</script>
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</body>
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</html>
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