Adjusting Local Context Search Bounds

You can change the locationRestriction parameter of the LocalContextMapView place search from the default of being strictly bound by the map viewport. In this example, we set the bounds of locationRestriction to be much larger than the map's initial viewport. Try clicking on a place in the place chooser to see the map move to show the selected place.

View source code

TypeScript

let map: google.maps.Map;

function initMap() {
  const center = { lat: 37.4219998, lng: -122.0840572 };
  const bigBounds = {
    north: 37.432,
    south: 37.412,
    west: -122.094,
    east: -122.074,
  };
  const localContextMapView = new google.maps.localContext.LocalContextMapView({
    element: document.getElementById("map"),
    placeTypePreferences: [{ type: "restaurant" }],
    maxPlaceCount: 12,
    locationRestriction: bigBounds,
    directionsOptions: { origin: center },
  });

  map = localContextMapView.map!;

  new google.maps.Marker({ position: center, map: map });

  map.setOptions({
    center: center,
    zoom: 16,
  });
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;index.ts

JavaScript

let map;

function initMap() {
  const center = { lat: 37.4219998, lng: -122.0840572 };
  const bigBounds = {
    north: 37.432,
    south: 37.412,
    west: -122.094,
    east: -122.074,
  };
  const localContextMapView = new google.maps.localContext.LocalContextMapView({
    element: document.getElementById("map"),
    placeTypePreferences: [{ type: "restaurant" }],
    maxPlaceCount: 12,
    locationRestriction: bigBounds,
    directionsOptions: { origin: center },
  });

  map = localContextMapView.map;
  new google.maps.Marker({ position: center, map: map });
  map.setOptions({
    center: center,
    zoom: 16,
  });
}

window.initMap = 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;
}
style.css

HTML

<html>
  <head>
    <title>Local Context Restrictions</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- 
      The `defer` attribute causes the callback to execute after the full HTML
      document has been parsed. For non-blocking uses, avoiding race conditions,
      and consistent behavior across browsers, consider loading using Promises.
      See https://developers.google.com/maps/documentation/javascript/load-maps-js-api
      for more information.
      -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=localContext&v=beta"
      defer
    ></script>
  </body>
</html>index.html

Try Sample

JSFiddle.net CodeSandbox.io Google Cloud Shell

Understand the code

Specifying Local Context search bounds

Define the locationRestriction strict search bounds with a LatLngBounds property. This example uses the LatLngBoundsLiteral interface to create a LatLngBounds object.

TypeScript

const bigBounds = {
  north: 37.432,
  south: 37.412,
  west: -122.094,
  east: -122.074,
};
const localContextMapView = new google.maps.localContext.LocalContextMapView({
  element: document.getElementById("map"),
  placeTypePreferences: [{ type: "restaurant" }],
  maxPlaceCount: 12,
  locationRestriction: bigBounds,
  directionsOptions: { origin: center },
});index.ts

JavaScript

const bigBounds = {
  north: 37.432,
  south: 37.412,
  west: -122.094,
  east: -122.074,
};
const localContextMapView = new google.maps.localContext.LocalContextMapView({
  element: document.getElementById("map"),
  placeTypePreferences: [{ type: "restaurant" }],
  maxPlaceCount: 12,
  locationRestriction: bigBounds,
  directionsOptions: { origin: center },
});
index.js

The relationship between the Local Context map viewport and `directionsOptions`

When a selected point of interest (POI) falls outside the current viewport, the Local Context map view automatically moves to show that POI within visible bounds without requiring any code to manage the map.

If you do not specify an origin point for the directionsOptions property of LocalContextMapView, the map will move to show just the selected POI.

If you do specify directionsOptions with an origin point, the map will show both the origin and the selected POI along with the walking route between the two points.

TypeScript

const localContextMapView = new google.maps.localContext.LocalContextMapView({
  element: document.getElementById("map"),
  placeTypePreferences: [{ type: "restaurant" }],
  maxPlaceCount: 12,
  locationRestriction: bigBounds,
  directionsOptions: { origin: center },
});index.ts

JavaScript

const localContextMapView = new google.maps.localContext.LocalContextMapView({
  element: document.getElementById("map"),
  placeTypePreferences: [{ type: "restaurant" }],
  maxPlaceCount: 12,
  locationRestriction: bigBounds,
  directionsOptions: { origin: center },
});
index.js

Try Sample

JSFiddle.net CodeSandbox.io Google Cloud Shell

Adjusting Local Context Search Bounds

View source code

TypeScript

JavaScript

CSS

HTML

Try Sample

Understand the code

Specifying Local Context search bounds

TypeScript

JavaScript

The relationship between the Local Context map viewport and directionsOptions

TypeScript

JavaScript

Try Sample

The relationship between the Local Context map viewport and `directionsOptions`