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Last active April 29, 2016 15:55
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How to make a choropleth map with CartoDB.js
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index.html
<!DOCTYPE html>
<html>
<head>
<title>How to make a choropleth map with CartoDB.js</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<link rel="shortcut icon" href="http://cartodb.com/assets/favicon.ico" />
<link rel="stylesheet" href="http://libs.cartocdn.com/cartodb.js/v3/3.15/themes/css/cartodb.css" />
<script src="http://libs.cartocdn.com/cartodb.js/v3/3.15/cartodb.js"></script>
<style>
html, body,#map {
width:100%;
height:100%;
padding: 0;
margin: 0;
}
</style>
</head>
<body>
<div id='map'></div>
<script type="cartocss/text" id="choropleth">
/** choropleth visualization */
#world_borders{
polygon-fill: #FFFFB2;
polygon-opacity: 0.8;
line-color: #FFF;
line-width: 0.5;
line-opacity: 1;
}
#world_borders [ pop2005 <= 1312978855] {
polygon-fill: #B10026;
}
#world_borders [ pop2005 <= 32270507] {
polygon-fill: #E31A1C;
}
#world_borders [ pop2005 <= 10528226] {
polygon-fill: #FC4E2A;
}
#world_borders [ pop2005 <= 5416945] {
polygon-fill: #FD8D3C;
}
#world_borders [ pop2005 <= 2253501] {
polygon-fill: #FEB24C;
}
#world_borders [ pop2005 <= 456613] {
polygon-fill: #FED976;
}
#world_borders [ pop2005 <= 67827] {
polygon-fill: #FFFFB2;
}
</script>
<script type="text/javascript">
function main() {
var style = $('#choropleth').text(); // get style
console.log(style);
var map = new L.Map('map', {
zoomControl: false,
center: [43, -30],
zoom: 3
});
cartodb.createLayer(map, {
user_name: 'ramirocartodb',
type: 'cartodb',
sublayers: [
{
type: "http", // add basemap without labels
urlTemplate: "http://{s}.basemaps.cartocdn.com/dark_nolabels/{z}/{x}/{y}.png",
subdomains: [ "a", "b", "c" ]
},
{
type: "mapnik", // add layer
sql: "SELECT * FROM world_borders",
cartocss: style
}
]
})
.addTo(map);
}
window.onload = main;
</script>
</body>
</html>
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