Add a Map with Events using HTML

  • This example demonstrates how to add event handling to gmp-advanced-marker elements using the Google Maps JavaScript API.

  • Clicking a marker on the map triggers a 'gmp-click' event, opening an InfoWindow displaying the marker's title.

  • The provided code snippets showcase the implementation in both TypeScript and JavaScript, along with HTML and CSS for styling and structure.

  • The sample utilizes Google Maps Web Components for creating interactive map elements.

  • You can interact with the live sample via JSFiddle or Google Cloud Shell, and clone the code for local execution using Git and Node.js.

This example demonstrates adding event handling to some gmp-advanced-marker elements, to show an InfoWindow when a marker is clicked.

Read the documentation.

TypeScript

// This example adds a map using web components.
async function initMap(): Promise<void> {
  const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker") as google.maps.MarkerLibrary;

  console.log('Maps JavaScript API loaded.');

  const advancedMarkers = document.querySelectorAll("#marker-click-event-example gmp-advanced-marker");

  for (const advancedMarker of advancedMarkers) {

    customElements.whenDefined(advancedMarker.localName).then(async () => {
      advancedMarker.addEventListener('gmp-click', async () => {

        const infoWindow = new google.maps.InfoWindow({
          //@ts-ignore
          content: advancedMarker.title,
        });
        infoWindow.open({
          //@ts-ignore
          anchor: advancedMarker
        });
      });
    });
  }
}

initMap();
index.ts

JavaScript

// This example adds a map using web components.
async function initMap() {
  const { Map } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker");

  console.log("Maps JavaScript API loaded.");

  const advancedMarkers = document.querySelectorAll(
    "#marker-click-event-example gmp-advanced-marker",
  );

  for (const advancedMarker of advancedMarkers) {
    customElements.whenDefined(advancedMarker.localName).then(async () => {
      advancedMarker.addEventListener("gmp-click", async () => {
        const infoWindow = new google.maps.InfoWindow({
          //@ts-ignore
          content: advancedMarker.title,
        });

        infoWindow.open({
          //@ts-ignore
          anchor: advancedMarker,
        });
      });
    });
  }
}

initMap();
index.js

CSS

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

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

gmp-map {
  height: 400px;
}

style.css

HTML

<html>
  <head>
    <title>Add a Map Web Component with Events</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <gmp-map
      id="marker-click-event-example"
      center="43.4142989,-124.2301242"
      zoom="4"
      map-id="DEMO_MAP_ID"
    >
      <gmp-advanced-marker
        position="37.4220656,-122.0840897"
        title="Mountain View, CA"
        gmp-clickable
      ></gmp-advanced-marker>
      <gmp-advanced-marker
        position="47.648994,-122.3503845"
        title="Seattle, WA"
        gmp-clickable
      ></gmp-advanced-marker>
    </gmp-map>

    <!-- prettier-ignore -->
    <script>(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]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+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+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})
        ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "beta"});</script>
  </body>
</html>
index.html

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. 

  git clone -b sample-web-components-events https://github.com/googlemaps/js-samples.git
  cd js-samples
  npm i
  npm start

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME. 

  git checkout sample-SAMPLE_NAME
  npm i
  npm start