index.ts

/**
 * @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

// [START maps_directions_panel]
function initMap(): void {
  const directionsRenderer = new google.maps.DirectionsRenderer();
  const directionsService = new google.maps.DirectionsService();
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      zoom: 7,
      center: { lat: 41.85, lng: -87.65 },
      disableDefaultUI: true,
    }
  );

  directionsRenderer.setMap(map);
  directionsRenderer.setPanel(
    document.getElementById("sidebar") as HTMLElement
  );

  const control = document.getElementById("floating-panel") as HTMLElement;

  map.controls[google.maps.ControlPosition.TOP_CENTER].push(control);

  const onChangeHandler = function () {
    calculateAndDisplayRoute(directionsService, directionsRenderer);
  };

  (document.getElementById("start") as HTMLElement).addEventListener(
    "change",
    onChangeHandler
  );
  (document.getElementById("end") as HTMLElement).addEventListener(
    "change",
    onChangeHandler
  );
}

function calculateAndDisplayRoute(
  directionsService: google.maps.DirectionsService,
  directionsRenderer: google.maps.DirectionsRenderer
) {
  const start = (document.getElementById("start") as HTMLInputElement).value;
  const end = (document.getElementById("end") as HTMLInputElement).value;

  directionsService
    .route({
      origin: start,
      destination: end,
      travelMode: google.maps.TravelMode.DRIVING,
    })
    .then((response) => {
      directionsRenderer.setDirections(response);
    })
    .catch((e) => window.alert("Directions request failed due to " + status));
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;
// [END maps_directions_panel]
export {};