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index.html
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<!DOCTYPE html>
<html>
<head>
<meta name="description" content="2020 Taiwan population density">
<title>2020 Taiwan population density</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"
integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
crossorigin=""/>
<!-- Make sure you put this AFTER Leaflet's CSS -->
<script src="https://unpkg.com/[email protected]/dist/leaflet.js"
integrity="sha512-gZwIG9x3wUXg2hdXF6+rVkLF/0Vi9U8D2Ntg4Ga5I5BZpVkVxlJWbSQtXPSiUTtC0TjtGOmxa1AJPuV0CPthew=="
crossorigin=""></script>
<style>
body {
padding: 0px;
margin: 0px;
}
html,
body,
#mapid {
position: absolute;
top:0;
bottom:0;
right:0;
left:0;
}
.info {
padding: 6px 8px;
font: 12px/15px Arial, Helvetica, sans-serif;
background: white;
background: rgba(255,255,255,0.8);
box-shadow: 0 0 15px rgba(0,0,0,0.2);
border-radius: 5px;
}
.info h4 {
margin: 0 0 5px;
color: #777;
}
.legend {
line-height: 18px;
color: #555;
}
.legend i {
width: 18px;
height: 18px;
float: left;
margin-right: 5px;
opacity: 0.7;
}
#map-title {
position: absolute;
margin-top: 8px;
margin-left: 45px;
float: left;
background: white;
border: 2px solid rgba(0,0,0,0.2);
padding: 6px 8px;
font-family: Helvetica;
font-weight: bold;
font-size: 15px;
z-index: 800;
}
</style>
</head>
<body>
<div id="map-title">2020年臺灣<br>人口密度（縣市）</div>
<div id="mapid"></div>
<script type="text/javascript" src="taiwan_json.js"></script> <!--add geoJson -->
<script>
//加入底圖
var mymap = L.map('mapid').setView([23.5, 121.5], 7);
L.tileLayer('https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4NXVycTA2emYycXBndHRqcmZ3N3gifQ.rJcFIG214AriISLbB6B5aw', {
maxZoom: 18,
attribution: 'Map data © <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> , <a href="https://www.mapbox.com/">Mapbox</a> '
,
id: 'mapbox/streets-v11',
tileSize: 512,
zoomOffset: -1
}).addTo(mymap);
// add geoJson
L.geoJson(TAIWAN).addTo(mymap);
//add info
var info = L.control();
info.onAdd = function (map) {
this._div = L.DomUtil.create('div', 'info'); // create a div with a class "info"
this.update();
return this._div;
};
// method that we will use to update the control based on feature properties passed
info.update = function (props) {
this._div.innerHTML = '<h4>臺灣人口密度</h4>' + (props ?
'<b>' + props.COUNTYNAME + '</b><br />' + props.POP_DEN + ' 人 / 平方公里'
: '移動滑鼠至各縣市');
};
info.addTo(mymap);
// hypsometric map
function getColor(d) {
return d > 9000 ? '#7f2704' :
d > 7000 ? '#a63603' :
d > 5000 ? '#d94801' :
d > 3000 ? '#f16913' :
d > 1000 ? '#fd8d3c' :
d > 500 ? '#fdae6b' :
d > 200 ? '#fdd0a2' :
d > 100 ? '#fee6ce' :
'#fff5eb';
}
// geoJson color
function style(feature) {
return {
fillColor: getColor(feature.properties.POP_DEN),
weight: 2,
opacity: 1,
color: 'white',
dashArray: '1',
fillOpacity: 0.7
};
}
//hover highlight
function highlightFeature(e) {
var layer = e.target;
layer.setStyle({
weight: 5,
color: 'blue',
dashArray: '',
fillOpacity: 0.7
});
if (!L.Browser.ie && !L.Browser.opera && !L.Browser.edge) {
layer.bringToFront();
}
info.update(layer.feature.properties);
}
var geojson;
//reset highlight
function resetHighlight(e) {
geojson.resetStyle(e.target);
info.update();
}
// zoom to when click county
function zoomToFeature(e) {
mymap.fitBounds(e.target.getBounds());
}
// function:mouse and click
function onEachFeature(feature, layer) {
layer.on({
mouseover: highlightFeature,
mouseout: resetHighlight,
click: zoomToFeature
});
}
geojson = L.geoJson(TAIWAN, {
style: style,
onEachFeature: onEachFeature
}).addTo(mymap);
// add legend
var legend = L.control({position: 'bottomright'});
legend.onAdd = function (map) {
var div = L.DomUtil.create('div', 'info legend'),
grades = [0, 100, 200, 500, 1000, 3000, 5000,7000, 9000],
labels = [];
// loop through our density intervals and generate a label with a colored square for each interval
for (var i = 0; i < grades.length; i++) {
div.innerHTML +=
'<i style="background:' + getColor(grades[i] + 1) + '"></i> ' +
grades[i] + (grades[i + 1] ? '–' + grades[i + 1] + '<br>' : '+');
}
return div;
};
legend.addTo(mymap);
mymap.attributionControl.addAttribution('Population data © <a href="https://www.ris.gov.tw/app/portal/346">中華民國內政部戶政司</a>');
</script>
</body>
</html>