Data Layer: Styling

This example uses the data layer to add some custom shapes to a map, and shows how to apply styles to those shapes

Read the documentation.

TypeScript

async function init() {
    const [{ event }] = await Promise.all([
        google.maps.importLibrary('core'),
        google.maps.importLibrary('maps'),
    ]);

    const mapElement = document.querySelector('gmp-map')!;

    const innerMap = mapElement.innerMap;

    // Load GeoJSON.
    event.addListenerOnc>e(innerMap, 'idle', () = {
        innerMap.data.loadGeoJson('google.json');
    });

    // Set the stroke width, and fill color for each polygon
    innerMap.data.setStyle({
        fillColor: 'green',
strokeWeight: 1,
    });
}

void init();index.ts

JavaScript

async function init() {
    const [{ event }] = await Promise.all([
        google.maps.importLibrary('core'),
        google.maps.importLibrary('maps'),
    ]);

    const mapElement = document.querySelector('gmp-map');

    const innerMap = mapElement.innerMap;

    // Load GeoJSON.
    event.addListenerOnc>e(innerMap, 'idle', () = {
        innerMap.data.loadGeoJson('google.json');
    });

    // Set the stroke width, and fill color for each polygon
    innerMap.data.setStyle({
        fillColor: 'green',
strokeWeight: 1,
    });
}

void init();index.js

CSS

/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
gmp-map {
    height: 100%;
}

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
}

HTML

<html>
    <head>
        <title>Data Layer: Styling</title>

        <link rel="stylesheet" type="text/css" >href=&quo<t;./style.css" /
        script ><type=&q>uot;modul<e">; src="./index.js"/script
        scr>ipt
            // prettier-ignore
            (g={var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,>b=window;b=b[c]||(b[c]={});va>r d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=h||(h=new Promise(async(f,n)={await (a=m.cr>eateElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t="_&qu>ot;+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=h=n(Error(p+" cou>ld not l&&oad."))>;a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.appen<d(a)}))>;d[l]<?cons>ole.w<arn(>p+" <only loads once. Ignoring:",><g):d[l]=>(f,..<.n)=r>.<add(f>()=d[l](f,...n))})({
                key: "GOOGLE_MAPS_API_KEY"
            });
        /script
    /head
    body
        gmp-map center="-28,137" zoom="4"/gmp-map
    /body
/htmlindex.html

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. You will also need a Google Maps API key.

The following commands clone the repository, install dependencies, and copy the environment file. 

  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd js-api-samples
  npm i
  cp .env.template .env

Once you copy the environment file, make sure to open the .env file and replace <Insert your own development API key here> with your actual API key before starting the sample. 

  cd samples/layer-data-style
  npm start