How to Limit Google Maps V3 to a Specific Geographic Area and Zoom Level?

Restricting Viewable Area and Zoom Level in Google Maps V3

Users may encounter scenarios where it becomes necessary to confine Google Maps V3 within specific geographical bounds and restrict its zoom capabilities. This article explores a solution to limit the map display to a designated area (e.g., a country) while preventing users from navigating beyond its boundaries. Additionally, it addresses how to restrict the zoom level to a pre-defined range.

To achieve this, Google Maps V3 provides the options of minZoom and maxZoom. By specifying these parameters, you can establish the minimum and maximum zoom levels allowed for the user.

Example:

var map;
var opt = { minZoom: 6, maxZoom: 9 };
map = new google.maps.Map(document.getElementById('map-canvas'), opt);

The above code ensures that users can only zoom the map within levels 6 to 9 inclusive. However, this solution only addresses the zoom level restriction. To limit the viewable area to a specific region, further customization is required. Customizing the map's styles using StyledMaps can achieve this goal.

Example:

var map;
var styles = [
  {
    "elementType": "geometry",
    "stylers": [
      {
        "visibility": "off"
      }
    ]
  },
  {
    "featureType": "administrative.country",
    "elementType": "geometry.stroke",
    "stylers": [
      {
        "visibility": "on"
      }
    ]
  }
];

map = new google.maps.Map(document.getElementById('map-canvas'));
map.setOptions({
  styles: styles,
  minZoom: 6,
  maxZoom: 9
});

This code sets all geographic features outside the designated country to be invisible, effectively restricting the viewable map area to that country. It also sets the minimum and maximum zoom levels to 6 and 9, respectively.

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