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March 4, 2017 22:39
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset=utf-8 /> | |
<title>Load GeoJSON from a URL</title> | |
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' /> | |
<script src='https://api.mapbox.com/mapbox.js/v2.3.0/mapbox.js'></script> | |
<link href='https://api.mapbox.com/mapbox.js/v2.3.0/mapbox.css' rel='stylesheet' /> | |
<style> | |
body { margin:0; padding:0; } | |
#map { position:absolute; top:0; bottom:0; width:100%; } | |
</style> | |
</head> | |
<body> | |
<div id='map'></div> | |
<script> | |
L.mapbox.accessToken = 'pk.eyJ1IjoiZGF0YXNmIiwiYSI6Ilo3bVlHRDQifQ.7gkiPnZtioL8CnCvJ5z9Bg'; | |
var map = L.mapbox.map('map', 'mapbox.streets') | |
.setView([37.773972, -122.431297], 13); | |
// As with any other AJAX request, this technique is subject to the Same Origin Policy: | |
// http://en.wikipedia.org/wiki/Same_origin_policy | |
// So the CSV file must be on the same domain as the Javascript, or the server | |
// delivering it should support CORS. In the case of Socrata open data calls, they do support CORS | |
var featureLayer = L.mapbox.featureLayer() | |
// The following is the geojson endpoint for bike paths in SF, available at https://data.sfgov.org/d/x3cv-qums | |
.loadURL('https://data.sfgov.org/resource/x3cv-qums.geojson?$limit=10000') | |
.on('ready', function() { | |
featureLayer.eachLayer(function(line) { | |
// we can grab the Bike Facility Type from the returned gejson (Bike Lane, Bike Path, etc) and style them differently | |
var facilityType = line.feature.properties.facility_type | |
var style | |
switch (facilityType) { | |
case 'BIKE PATH': | |
style = {color:'green'} | |
break | |
case 'BIKE LANE': | |
style = {color: 'red'} | |
break | |
default: | |
style = {color: 'blue'} | |
} | |
line.setStyle(style) | |
}) | |
}) | |
.addTo(map); | |
</script> | |
</body> | |
</html> |
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The above is from the Open Data 101 session at #OpenDataDay 2017. Shows a simple example of using an API call to display a simple map.