mirror of
https://github.com/Leaflet/Leaflet.git
synced 2025-12-08 21:26:14 +00:00
162 lines
3.5 KiB
HTML
162 lines
3.5 KiB
HTML
<!doctype html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Leaflet debug page - GeoJSON</title>
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<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0" />
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<link rel="stylesheet" href="../../dist/leaflet.css" />
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<link rel="stylesheet" href="../css/screen.css" />
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<style>
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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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<script type="importmap">
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{
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"imports": {
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"leaflet": "../../dist/leaflet-src.js"
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}
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}
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</script>
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</head>
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<body>
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<div id="map"></div>
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<script type="module">
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import {Map, TileLayer, Control, DomUtil, GeoJSON} from 'leaflet';
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import statesData from './us-states.js';
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const map = new Map('map').setView([37.8, -96], 4);
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const tiles = new TileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png');
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map.addLayer(tiles);
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// control that shows state info on hover
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const info = new Control();
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info.onAdd = function () {
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this._div = 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 = `
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<h4>US Population Density</h4>
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${(props ? `<b>${props.name}</b><br />${props.density} people / mi<sup>2</sup>` : 'Hover over a state')}
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`;
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};
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map.addControl(info);
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// get color depending on population density value
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function getColor(d) {
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return (
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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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}
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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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const layer = e.target;
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layer.setStyle({
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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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layer.bringToFront();
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info.update(layer.feature.properties);
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}
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const geojson = new GeoJSON(statesData, {
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style,
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onEachFeature,
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attribution: 'Population data © <a href="http://census.gov/">US Census Bureau</a>'
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});
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map.addLayer(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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pointerover: highlightFeature,
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pointerout: resetHighlight,
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click: zoomToFeature
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});
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}
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const legend = new Control({position: 'bottomright'});
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legend.onAdd = function () {
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const div = DomUtil.create('div', 'info legend');
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const grades = [0, 10, 20, 50, 100, 200, 500, 1000];
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const labels = [];
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for (let i = 0; i < grades.length; i++) {
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const from = grades[i];
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const to = grades[i + 1];
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labels.push(
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`<i style="background: ${getColor(from + 1)};"></i> ${from + (to ? ` – ${to}` : '+')}`
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);
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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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