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index.html
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<!DOCTYPE html>
<html>
<head>
<title>leaflet-map-csv</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta charset="utf-8">
<!-- Load Leaflet code library - see updates at http://leafletjs.com/download.html -->
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"/>
<script src="https://unpkg.com/[email protected]/dist/leaflet.js"></script>
<!-- Load jQuery and PapaParse to read data from a CSV file -->
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/papaparse.min.js"></script>
<!-- Position the map with Cascading Style Sheet (CSS) -->
<style>
body { margin:0; padding:0; }
#map { position: absolute; top:0; bottom:0; right:0; left:0; }
</style>
</head>
<body>
<!-- Insert HTML division tag to layout the map -->
<div id="map"></div>
<!-- Insert Javascript (.js) code to create the map -->
<script>
// Set up initial map center and zoom level
var map = L.map('map', {
center: [41.57, -72.69], // EDIT latitude, longitude to re-center map
zoom: 9, // EDIT from 1 to 18 -- decrease to zoom out, increase to zoom in
scrollWheelZoom: false,
tap: false
});
/* Control panel to display map layers */
var controlLayers = L.control.layers( null, null, {
position: "topright",
collapsed: false
}).addTo(map);
// display Carto basemap tiles with light features and labels
var light = L.tileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png', {
attribution: '© <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>, © <a href="https://carto.com/attribution">CARTO</a>'
}).addTo(map); // EDIT - insert or remove ".addTo(map)" before last semicolon to display by default
controlLayers.addBaseLayer(light, 'Carto Light basemap');
/* Stamen colored terrain basemap tiles with labels */
var terrain = L.tileLayer('https://stamen-tiles.a.ssl.fastly.net/terrain/{z}/{x}/{y}.png', {
attribution: 'Map tiles by <a href="http://stamen.com">Stamen Design</a>, under <a href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a>. Data by <a href="http://openstreetmap.org">OpenStreetMap</a>, under <a href="http://www.openstreetmap.org/copyright">ODbL</a>.'
}); // EDIT - insert or remove ".addTo(map)" before last semicolon to display by default
controlLayers.addBaseLayer(terrain, 'Stamen Terrain basemap');
// see more basemap options at https://leaflet-extras.github.io/leaflet-providers/preview/
// Read markers data from data.csv
$.get('./data.csv', function(csvString) {
// Use PapaParse to convert string to array of objects
var data = Papa.parse(csvString, {header: true, dynamicTyping: true}).data;
// For each row in data, create a marker and add it to the map
// For each row, columns `Latitude`, `Longitude`, and `Title` are required
for (var i in data) {
var row = data[i];
var marker = L.marker([row.Latitude, row.Longitude], {
opacity: 1
}).bindPopup(row.Title);
marker.addTo(map);
}
});
map.attributionControl.setPrefix(
'View <a href="https://github.com/HandsOnDataViz/leaflet-map-csv" target="_blank">code on GitHub</a>'
);
</script>
</body>
</html>