Setting extents for a map using MapLibre

There are times that you do not want your users to be able to pan or zoom around the entire world. If you are using MapLibre's map control, you can limit the extents, or bounds, of the map control with the maxBounds option, and constrain the zoom with minZoom and maxZoom options.

The following code sample shows how to initialize the map control to constrain panning to a specific boundary (in this case, the extents of the Grab data source).

Note

These samples are in javascript, and work within the context of the Creating a web app tutorial.

// Set bounds to Grab data provider region 
var bounds = [
        [90.0, -21.943045533438166], // Southwest coordinates
        [146.25, 31.952162238024968] // Northeast coordinates
    ];

var mlglMap = new maplibregl.Map(
    {
    container: 'map',
    style: mapName,
    maxBounds: bounds // Sets bounds as max
    transformRequest,
    }
);

Similarly, you can set a minimum and maximum zoom level for the map. The values for both can be between 0 and 24, although the defaults are 0 for minimum zoom and 22 for maximum (data providers may not provide data at all zoom levels. Most map libraries handle this automatically). The following example initializes the minZoom and maxZoom options on the MapLibre Map control.

// Set the minimum and maximum zoom levels 
var mlglMap = new maplibregl.Map(
    {
    container: 'map',
    style: mapName,
    maxZoom: 12,
    minZoom: 5,
    transformRequest,
    }
);

Tip

The MapLibre Map control also allows setting these options at runtime, rather than during initialization, with get... and set... functions. For example, use getMaxBounds and setMaxBounds to change the map bounds at runtime.