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Change map projections from two layers with CARTO.js
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8"> | |
<title>Change Map Projections</title> | |
<meta name="description" content=""> | |
<meta name="author" content=""> | |
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> | |
<link rel="stylesheet" href="https://cartodb-libs.global.ssl.fastly.net/cartodb.js/v3/3.15/themes/css/cartodb.css" /> | |
<script src="https://cartodb-libs.global.ssl.fastly.net/cartodb.js/v3/3.15/cartodb.js"></script> | |
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet" /> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script> | |
<style> | |
html, body, #map { | |
height: 100%; | |
padding: 0; | |
margin: 0; | |
background-color: #B8D0CB; | |
} | |
#wraper-prj-selector { | |
position: absolute; | |
top: 20px; | |
right: 20px; | |
} | |
.js-prj-selector { | |
width: 240px; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="map"></div> | |
<div id="wraper-prj-selector"> | |
<select class="js-prj-selector"> | |
<option value="#" selected disabled>Select a map projection</option> | |
</select> | |
</div> | |
<script type="text/javascript"> | |
function main() { | |
var selector = $(".js-prj-selector"); | |
var map = L.map('map', { | |
center: [40, 0], | |
zoom: 3 | |
}); | |
cartodb.createLayer(map, { | |
user_name: 'ramirocartodb', | |
type: 'cartodb', | |
sublayers: [{ | |
sql: 'select * from ne_50m_land', | |
cartocss: '#layer{polygon-fill: #98B087;}' | |
}, | |
{ | |
sql: 'select * from populated_places', | |
cartocss: '#layer{dot-fill: white; dot-width: 2}' | |
}] | |
}, { https: true }) | |
.addTo(map) | |
.done(function(layer) { | |
var land = layer.getSubLayer(0), | |
cities = layer.getSubLayer(1); | |
var sql = new cartodb.SQL({ user: 'ramirocartodb' }); | |
sql.execute("SELECT * FROM ramirocartodb.map_projs ORDER BY auth_srid") | |
.done(function(data) { | |
var srids = data.rows; | |
_.each(srids, function(srid, index, srids){ | |
selector.append("<option value=" + srid['auth_srid'] + ">" + srid['geogcs'] + "</option>"); | |
}) | |
selector.select2(); | |
}); | |
selector.change(function(){ | |
var input = $( ".js-prj-selector option:selected" ).val(); | |
land.setSQL("SELECT cartodb_id, st_transform(the_geom, " + input + ") as the_geom_webmercator FROM ne_50m_land"); | |
cities.setSQL("SELECT cartodb_id, st_transform(the_geom, " + input + ") as the_geom_webmercator FROM populated_places"); | |
}); | |
}); | |
} | |
window.onload = main; | |
</script> | |
</body> | |
</html> |
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