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index.html
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<!DOCTYPE html>
<html>
<head>
<title>leaflet-asset-map</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 HTML 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 hold the map -->
<div id="map"></div>
<!-- Insert Javascript (.js) code to create the map. This is where we use Leaflet, via the L object. -->
<script>
// Set up initial map center and zoom level
var map = L.map('map', {
center: [40.71, -73.95], // EDIT latitude, longitude to re-center map
zoom: 11, // EDIT from 1 to 18 -- decrease to zoom out, increase to zoom in
tap: false
});
// DEFINE LAYERS
// basemaps
// see more basemap options at https://leaflet-extras.github.io/leaflet-providers/preview/
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>'
});
// Create a layer group and then read markers data from NYChospitals.csv
// Using a layer group allows us to group these for the layer control
var hospitalLayer = L.layerGroup();
$.get('./data/NYChospitals.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 hospital layer
// For each row, columns `LATITUDE`, `LONGITUDE` are used to position the marker, and FACNAME is used in the popup.
for (var i in data) {
var row = data[i];
var marker = L.marker([row.LATITUDE, row.LONGITUDE], {
opacity: 1,
}).bindPopup(row.FACNAME)
marker.addTo(hospitalLayer);
}
});
// Add layers to map to show up by default
light.addTo(map)
hospitalLayer.addTo(map)
// Set proper link to Github repo in attribution control
map.attributionControl.setPrefix(
'View <a href="https://github.com/healthyregions/leaflet-asset-map" target="_blank">code on GitHub</a>'
);
</script>
</body>
</html>