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Created October 16, 2015 15:28
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Basic filtering with SQL through createLayer
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<title>Annotation element (no ball) | 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" />
<style>
html, body, #map {
height: 90%;
padding: 0;
margin: 0;
}
</style>
<link rel="stylesheet" href="http://libs.cartocdn.com/cartodb.js/v3/3.15/themes/css/cartodb.css" />
</head>
<body>
<div id="map"></div>
<button type="button" id="button-basemap1" onclick="setButton1();"> Button 1 (Spain)</button>
<button type="button" id="button-basemap2" onclick="setButton2();"> Button 2 (Area > 5000)</button>
<!-- include cartodb.js library -->
<script src="http://libs.cartocdn.com/cartodb.js/v3/3.15/cartodb.js"></script>
<script>
var dataLayer;
function setButton1(){
//filtering by country name
dataLayer.setSQL("select * from european_countries_e where name = 'Spain'");
//changing the css too
dataLayer.setCartoCSS("#european_countries_e{ polygon-fill: #CCC; polygon-opacity: 0.8; line-color: #FFF; line-width: 1; line-opacity: 0.5; } ");
}
function setButton2(){
//filtering by area
dataLayer.setSQL("select * from european_countries_e where area > 5000");
//changing the css, not mandatory!
dataLayer.setCartoCSS("#european_countries_e{ polygon-fill: #FFFFB2; polygon-opacity: 0.8; line-color: #FFF; line-width: 1; line-opacity: 0.5; } #european_countries_e [ area <= 1638094] { polygon-fill: #B10026; } #european_countries_e [ area <= 55010] { polygon-fill: #E31A1C; } #european_countries_e [ area <= 34895] { polygon-fill: #FC4E2A; } #european_countries_e [ area <= 12890] { polygon-fill: #FD8D3C; } #european_countries_e [ area <= 10025] { polygon-fill: #FEB24C; } #european_countries_e [ area <= 9150] { polygon-fill: #FED976; } #european_countries_e [ area <= 5592] { polygon-fill: #FFFFB2; } ");
}
function main() {
var map = new L.Map('map', {
zoomControl: false,
center: [43, 0],
zoom: 3
});
//Adding the basemap here
var basemap = L.tileLayer('http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, &copy; <a href="http://cartodb.com/attributions">CartoDB</a>'
}).addTo(map);
cartodb.createLayer(map, {
//change your username below
user_name: 'documentation',
type: 'cartodb',
sublayers: [{
//change your sql below
sql: "SELECT e.cartodb_id, e.area, w.subregion, w.un, e.the_geom, e.the_geom_webmercator FROM european_countries_e e LEFT JOIN world_borders w ON e.iso_2_code = w.iso2",
//change your cartocss below. you can copy it from the CartoDB Editor and remove the line breaks.
cartocss: "#european_countries_e{ polygon-fill: #FFFFB2; polygon-opacity: 0.8; line-color: #FFF; line-width: 1; line-opacity: 0.5; } #european_countries_e [ area <= 1638094] { polygon-fill: #B10026; } #european_countries_e [ area <= 55010] { polygon-fill: #E31A1C; } #european_countries_e [ area <= 34895] { polygon-fill: #FC4E2A; } #european_countries_e [ area <= 12890] { polygon-fill: #FD8D3C; } #european_countries_e [ area <= 10025] { polygon-fill: #FEB24C; } #european_countries_e [ area <= 9150] { polygon-fill: #FED976; } #european_countries_e [ area <= 5592] { polygon-fill: #FFFFB2; }"
}]
})
.addTo(map)
.done(function(layer) {
//here I store the layer in the variable, so that we can query it outside this function
dataLayer = layer.getSubLayer(0);
})
.error(function(err) {
console.log(err);
});
}
window.onload = main;
</script>
</body>
</html>
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