map-events

Sample code supporting Google Maps Platform JavaScript API documentation. author(s): Geo Developer IX Documentation Team

HTML

<!doctype html>
<!--
 @license
 Copyright 2026 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>Map Events</title>

    <script>
      // 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]={});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))})({
            });
    </script>
  </head>
  <body>
    <gmp-map center="37.4419, -122.1419" zoom="13">
      <div id="container" slot="control-inline-start-block-start">
        <div id="sidebar"></div>
      </div>
    </gmp-map>
  </body>
</html>

CSS

/**
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

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

#container {
  height: 100%;
}

#sidebar {
  width: 280px;
  padding: 2px;
  margin-left: 10px;
  margin-top: 10px;
  overflow: hidden;
  font-size: 15px;
  font-family: 'Droid Sans Mono', monospace;
  max-width: 300px;
  background-color: white;
}

.active {
  background-color: #99ccff;
}

.inactive {
  background-color: white;
}

JavaScript

'use strict';
/**
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

const events = [
  'bounds_changed',
  'center_changed',
  'click',
  'contextmenu',
  'dblclick',
  'drag',
  'dragend',
  'dragstart',
  'heading_changed',
  'idle',
  'maptypeid_changed',
  'mousemove',
  'mouseout',
  'mouseover',
  'projection_changed',
  'resize',
  'rightclick', // use contextmenu
  'tilesloaded',
  'tilt_changed',
  'zoom_changed',
];

function setupListener(map, name) {
  const eventRow = document.getElementById(name);
  map.addListener(name, () => {
    eventRow.className = 'event active';
    setTimeout(() => {
      eventRow.className = 'event inactive';
    }, 1000);
  });
}

async function init() {
  // Request needed libraries.
  await google.maps.importLibrary('maps');

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

  populateTable();

  // Get the inner map.
  const innerMap = mapElement.innerMap;
  innerMap.setOptions({
    mapTypeControl: false,
  });

  for (const event of events) {
    setupListener(innerMap, event);
  }
}

// Dynamically create the table of events from the defined hashmap
function populateTable() {
  const eventsTable = document.getElementById('sidebar');

  for (const event of events) {
    const eventDiv = document.createElement('div');
    eventDiv.className = 'event';
    eventDiv.id = event;
    eventDiv.innerText = event;
    eventsTable.appendChild(eventDiv);
  }
}

void init();