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Drilldown in JavaScript Maps control

22 Oct 2021 / 2 minutes to read

By clicking a continent, all the countries available in that continent can be viewed using the drill-down feature. For example, the countries in the Africa continent have been showcased here. To showcase all the countries in Africa continent by clicking the shapeSelected event as mentioned in the following example.

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index.ts
index.html
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import { world_map } from './world-map.ts';
import { Africa_Continent } from './Africa_Continent.ts';
import { default_data } from './data.ts';
import { Maps,Highlight,IShapeSelectedEventArgs,shapeSelected,Marker} from '@syncfusion/ej2-maps';
Maps.Inject(Highlight,Marker );

export interface ShapeData {
    continent?: string;
}

// Initialize Maps component.
let map: Maps = new Maps({
    shapeSelected: (args: IShapeSelectedEventArgs): void => {
        let shape: string = (args.shapeData as ShapeData).continent;
        if (shape === 'Africa') {
            map.baseLayerIndex = 1;
            map.refresh();
        }
    },
    layers: [
        {
            layerType: 'Geometry',
            shapeData: world_map,
            shapePropertyPath: 'continent',
            shapeDataPath: 'continent',
            dataSource:default_data,
            shapeSettings: {
                colorValuePath: 'drillColor'
            },
            markerSettings: [{
                visible: true,
                template: '<div id="marker3" class="markerTemplate">Africa' +
                    '</div>',
                dataSource: [
                    { latitude: 10.97274101999902, longitude: 16.390625 }
                ],
                animationDuration: 0
            }]
        },
        {
            layerType: 'Geometry',
            shapeData: Africa_Continent,
            shapeSettings: {
                fill: '#80306A'
            },
            highlightSettings: {
                enable: true,
                fill: '#80306A'
            }
        }
    ]
});
map.appendTo('#element');
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<!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="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="world-map.js"></script>
    <script src="usa.js"></script>
    <script src="data.js"></script>
    <script src="california.js"></script>
    <script src="texas.js"></script>
    <script src="africa_continent.js"></script>
    <script src="africa.js"></script>
    <script src="cluster.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container' style="height: 500px; width: 700px">
        <div id='element'></div>
    </div>
    <svg height="150" width="400">
        <defs>
            <linearGradient id="grad1" x1="0%" y1="0%" x2="0%" y2="100%">
                <stop offset="0%" style="stop-color:#C5494B;stop-opacity:1" />
                <stop offset="100%" style="stop-color:#4C134F;stop-opacity:1" />
            </linearGradient>
        </defs>
    </svg>
    <!-- annotation content -->
    <div id="maps-annotation" style="display: none;">
        <div id="annotation">
            <div>
                <p style="margin-left:10px;font-size:13px;font-weight:500">Facts about Africa</p>
            </div>
            <hr style="margin-top:-3px;margin-bottom:10px;border:0.5px solid #DDDDDD">
            <div>
                <ul style="list-style-type:disc; margin-left:-20px;margin-bottom:2px; font-weight:400">
                    <li>Africa is the second largest and second most populated continent in the world.</li>
                    <li style="padding-top:5px;">Africa has 54 sovereign states and 10 non-sovereign territories.</li>
                    <li style="padding-top:5px;">Algeria is the largest country in Africa, where as Mayotte is the smallest.</li>
                </ul>
            </div>
        </div>
    </div>
    <div id="compass-maps" style="display: none;">
        <img src="templates/maps/how-to/annotation/compass.png" height="75px" width="75px">
    </div>
    <style>
        #annotation {
            color: #DDDDDD;
            font-size: 12px;
            font-family: Roboto;
            background: #3E464C;
            margin: 20px;
            padding: 10px;
            -webkit-border-radius: 2px;
            -moz-border-radius: 2px;
            border-radius: 2px;
            width: 300px;
            -moz-box-shadow: 0px 2px 5px #666;
            -webkit-box-shadow: 0px 2px 5px #666;
            box-shadow: 0px 2px 5px #666;
        }
        .country-label {
            color: white;
            font-size: 25px;
        }
    </style>
</body>

</html>
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<div id="mapdrilldown"></div>
  <style>
     .markerTemplate {
        font-size: 12px;
        color: white;
        text-shadow: 0px 1px 1px black;
        font-weight: 500
    }
    .markerTemplate {
        height: 30px;
        width: 30px;
        display: block;
        margin: auto;
    }
  </style>