1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
| import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import {CartoDB, OSM} from 'ol/source.js';
const mapConfig = {
'layers': [
{
'type': 'cartodb',
'options': {
'cartocss_version': '2.1.1',
'cartocss': '#layer { polygon-fill: #F00; }',
},
},
],
};
function setArea(n) {
mapConfig.layers[0].options.sql =
'select * from european_countries_e where area > ' + n;
}
const areaSelect = document.getElementById('country-area');
setArea(areaSelect.value);
const cartoDBSource = new CartoDB({
account: 'documentation',
config: mapConfig,
});
areaSelect.addEventListener('change', function () {
setArea(this.value);
cartoDBSource.setConfig(mapConfig);
});
const map = new Map({
layers: [
new TileLayer({
source: new OSM(),
}),
new TileLayer({
source: cartoDBSource,
}),
],
target: 'map',
view: new View({
center: [8500000, 8500000],
zoom: 2,
}),
});
|
)
