Layers in EJ2 JavaScript Maps control

27 Apr 20238 minutes to read

The Maps component is rendered through layers and any number of layers can be added to the Maps.

Multilayer

The Multilayer support allows loading multiple shapefiles and map providers in a single container, enabling Maps to display more information. The shape layer or map providers are the main layers of the Maps. Multiple layers can be added as SubLayer over the main layers using the type property in the layers.

SubLayer

Sublayer is a type of shape file layer. It allows loading multiple shape files in a single map view. For example, a sublayer can be added over the main layer to view geographic features such as rivers, valleys and cities in a map of a country. Similar to the main layer, elements in the Maps such as markers, bubbles, color mapping and legends can be added to the sub-layer.

In this example, the United States map shape is used as shape data by utilizing the usa.ts file, and the texas.ts and california.ts files are used as sub-layers in the United States map.

var map = new ej.maps.Maps({
    layers: [
        {
            shapeData: usa_map,
            shapeSettings: {
                fill: '#E5E5E5',
                border: {
                    color: 'black',
                    width: 0.1
                }
            }
        },
        {
            shapeData: texas,
            type: 'SubLayer',
            shapeSettings: {
                fill: 'rgba(141, 206, 255, 0.6)',
                border: {
                    color: '#1a9cff',
                    width: 0.25
                }
            }
        },
        {
            shapeData: california,
            type: 'SubLayer',
            shapeSettings: {
                fill: 'rgba(141, 206, 255, 0.6)',
                border: {
                    color: '#1a9cff',
                    width: 0.25
                }
            }
        }
    ]
});
map.appendTo('#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Maps</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <script src="usa.js"></script>
    <script src="california.js"></script>
    <script src="texas.js"></script>

    <script src="https://cdn.syncfusion.com/ej2/30.1.37/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>

    <div id="container" style="height: 500px; width: 700px">
        <div id="element"></div>
    </div>

    <script>
        var ele = document.getElementById('container');
        if (ele) {
            ele.style.visibility = "visible";
        }   
    </script>
    <script src="index.js" type="text/javascript"></script>
</body>

</html>

Displaying layer in the view

Multiple shape files and map providers can be loaded simultaneously in Maps. The baseLayerIndex property is used to determine which layer on the user interface should be displayed. This property is used for the Maps drill-down feature, so when the baseLayerIndex value is changed, the corresponding shape is loaded. In this example, two layers can be loaded with the World map and the United States map. Based on the given baseLayerIndex value the corresponding shape will be loaded in the user interface. If the baseLayerIndex value is set to 0, then the world map will be loaded.

var map = new ej.maps.Maps({
    baseLayerIndex: 1,
    layers: [
        {
           shapeData: world_map,
        },
        {
           shapeData: usa_map
        }
   ]
});
map.appendTo('#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Maps</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">

    <script src="world-map.js"></script>
    <script src="usa.js"></script>

    <script src="https://cdn.syncfusion.com/ej2/30.1.37/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>

    <div id="container" style="height: 500px; width: 700px">
        <div id="element"></div>
    </div>


    <script>
        var ele = document.getElementById('container');
        if (ele) {
            ele.style.visibility = "visible";
        }   
    </script>
    <script src="index.js" type="text/javascript"></script>
</body>

</html>

See Also