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Supplement forward geocoding search results from another data source

Use the mapbox-gl-geocoder control to search for places using Mapbox Geocoding API, supplementing results from a local data source or function, in this case to match Chicago Park names with text input.

Mapbox GL unsupported
Mapbox GL requires WebGL support. Please check that you are using a supported browser and that WebGL is enabled.
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>Supplement forward geocoding search results from another data source</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.53.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.53.1/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<script src='https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.0.0/mapbox-gl-geocoder.min.js'></script>
<link rel='stylesheet' href='https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.0.0/mapbox-gl-geocoder.css' type='text/css' />
<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [-87.6244, 41.8756],
zoom: 13
});
var customData = {
"features": [
{
"type": "Feature",
"properties": {
"title": "Lincoln Park",
"description": "A northside park that is home to the Lincoln Park Zoo"
},
"geometry": {
"coordinates": [
-87.637596,
41.940403
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Burnham Park",
"description": "A lakefront park on Chicago's south side"
},
"geometry": {
"coordinates": [
-87.603735,
41.829985
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Millennium Park",
"description": "A downtown park known for its art installations and unique architecture"
},
"geometry": {
"coordinates": [
-87.622554,
41.882534
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Grant Park",
"description": "A downtown park that is the site of many of Chicago's favorite festivals and events"
},
"geometry": {
"coordinates": [
-87.619185,
41.876367
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Humboldt Park",
"description": "A large park on Chicago's northwest side"
},
"geometry": {
"coordinates": [
-87.70199,
41.905423
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Douglas Park",
"description": "A large park near in Chicago's North Lawndale neighborhood"
},
"geometry": {
"coordinates": [
-87.699329,
41.860092
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Calumet Park",
"description": "A park on the Illinois-Indiana border featuring a historic fieldhouse"
},
"geometry": {
"coordinates": [
-87.530221,
41.715515
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Jackson Park",
"description": "A lakeside park that was the site of the 1893 World's Fair"
},
"geometry": {
"coordinates": [
-87.580389,
41.783185
],
"type": "Point"
}
},
{
"type": "Feature",
"properties": {
"title": "Columbus Park",
"description": "A large park in Chicago's Austin neighborhood"
},
"geometry": {
"coordinates": [
-87.769775,
41.873683
],
"type": "Point"
}
}
],
"type": "FeatureCollection"
};
function forwardGeocoder(query) {
var matchingFeatures = [];
for (var i = 0; i < customData.features.length; i++) {
var feature = customData.features[i];
// handle queries with different capitalization than the source data by calling toLowerCase()
if (feature.properties.title.toLowerCase().search(query.toLowerCase()) !== -1) {
// add a tree emoji as a prefix for custom data results
// using carmen geojson format: https://github.com/mapbox/carmen/blob/master/carmen-geojson.md
feature['place_name'] = '🌲 ' + feature.properties.title;
feature['center'] = feature.geometry.coordinates;
feature['place_type'] = ['park'];
matchingFeatures.push(feature);
}
}
return matchingFeatures;
}
map.addControl(new MapboxGeocoder({
accessToken: mapboxgl.accessToken,
localGeocoder: forwardGeocoder,
zoom: 14,
placeholder: "Enter search e.g. Lincoln Park",
mapboxgl: mapboxgl
}));
</script>
</body>
</html>