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Bubble in JavaScript Maps control

24 Jun 2022 / 6 minutes to read

Bubbles in the Maps control represent the underlying data values of the map. It can be scattered throughout the map shapes that contain values in the data source. Bubbles are enabled by setting the visible property of bubbleSettings to true. To render bubble in Maps, Bubble module must be injected into Maps using Maps.Inject(Bubble) method.

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import { Maps, Bubble } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble);
let map: Maps = new Maps({ });

To add bubbles to the map, bind the data source to the dataSource property of bubbleSettings and set the field name, that contains the numerical data, in the data source to the valuePath property.

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export let world_map = // paste the World map from WorldMap.json Geo json file.
Source
Preview
index.ts
index.html
Copied to clipboard
import { world_map } from './world-map.ts';
import { Maps, Bubble } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble);
let map: Maps = new Maps({
    layers: [{
        shapeData: world_map,
        shapeDataPath: 'name',
        shapePropertyPath: 'name',
        bubbleSettings: [{
            visible: true,
            minRadius: 20,
            dataSource: [
                { name: 'India', population: '38332521' },
                { name: 'New Zealand', population: '19651127' },
                { name: 'Pakistan', population: '3090416' }
            ],
            maxRadius: 40,
            valuePath: 'population'
        }]
    }]
});
map.appendTo('#element');
Copied to clipboard
<!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>

Bubble shapes

The following types of shapes are available to render the bubbles in Maps.

  • Circle
  • Square

By default, bubbles are rendered in Circle type. To change the type of the bubble, set the bubbleType property of bubbleSettings as Square to render the square shape bubbles.

Source
Preview
index.ts
index.html
Copied to clipboard
import { world_map } from './world-map.ts';
import { Maps, Bubble } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble);
let map: Maps = new Maps({
layers: [{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    bubbleSettings: [{
        bubbleType: 'Square',
        visible: true,
        dataSource: [
            { name: 'India', population: '38332521' },
            { name: 'Pakistan', population: '3090416' }
        ],
        valuePath: 'population'
    }]
}]
});
map.appendTo('#element');
Copied to clipboard
<!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>

Customization

The following properties are available in bubbleSettings to customize the bubbles of the Maps component.

  • border – To customize the color, width and opacity of the border of the bubbles in Maps.
  • fill – To apply the color for bubbles in Maps.
  • opacity – To apply opacity to the bubbles in Maps.
  • animationDelay - To change the time delay in the transition for bubbles.
  • animationDuration - To change the time duration of animation for bubbles.
Source
Preview
index.ts
index.html
Copied to clipboard
import { world_map } from './world-map.ts';
import { Maps, Bubble } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble);
let map: Maps = new Maps({
layers: [{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    bubbleSettings: [{
        visible: true,
        minRadius: 5,
        dataSource: [
            { name: 'India', population: '38332521' },
            { name: 'New Zealand', population: '19651127' },
            { name: 'Pakistan', population: '3090416' }
        ],
        fill: 'green',
        animationDelay: 100,
        animationDuration: 1000,
        maxRadius: 80,
        border: {
         color: 'blue',
         width: 2
        },
        opacity: 1,
        valuePath: 'population'
    }]
}]
});
map.appendTo('#element');
Copied to clipboard
<!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>

Setting color to the bubbles from the data source

The color for each bubble in the Maps can be set using the colorValuePath property of bubbleSettings. The value for the colorValuePath property is the field name from the data source of the bubbleSettings which contains the color code values.

Source
Preview
index.ts
index.html
Copied to clipboard
import { world_map } from './world-map.ts';
import { Maps, Bubble } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble);
let map: Maps = new Maps({
layers: [{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    bubbleSettings: [{
        visible: true,
        minRadius: 20,
        colorValuePath: 'color',
        dataSource: [
            { name: 'India', population: '38332521', color: 'blue' },
            { name: 'New Zealand', population: '19651127', color: '#c2d2d6'  },
            { name: 'Pakistan', population: '3090416', color: '#09156d'  }
        ],
    maxRadius: 40,
    valuePath: 'population'
    }]
}]
});
map.appendTo('#element');
Copied to clipboard
<!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>

Bubble Sizing

The size of the bubbles is calculated from the values got from the valuePath property. The range for the radius of the bubbles can be modified using minRadius and maxRadius properties.

Source
Preview
index.ts
index.html
Copied to clipboard
import { world_map } from './world-map.ts';
import { Maps, Bubble } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble);
let map: Maps = new Maps({
layers: [{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    bubbleSettings: [{
        visible: true,
        minRadius: 5,
        dataSource: [
            { name: 'India', population: '38332521' },
            { name: 'New Zealand', population: '19651127' },
            { name: 'Pakistan', population: '3090416' }
        ],
        maxRadius: 80,
        valuePath: 'population'
    }]
}]
});
map.appendTo('#element');
Copied to clipboard
<!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>

Multiple bubble groups

Multiple groups of bubbles can be added as an array using the bubbleSettings and customization for the bubbles can be done with this property. In the following example, the gender-wise population ratio is demonstrated with two different bubble groups.

Source
Preview
index.ts
index.html
Copied to clipboard
import { world_map } from './world-map.ts';
import { Maps, Bubble } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble);
let map: Maps = new Maps({
layers: [{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    bubbleSettings: [{
        visible: true,
        minRadius: 5,
        valuePath: "femaleRatio",
        colorValuePath: "femaleRatioColor",
        dataSource: [
            {
                country: "United States", femaleRatio: 50.50442726, maleRatio: 49.49557274, femaleRatioColor: "green", maleRatioColor: "blue"
            },
            {
                country: "India", femaleRatio: 48.18032713, maleRatio: 51.81967287, femaleRatioColor: "blue", maleRatioColor: "#c2d2d6"
            },
            {
                country: "Oman", femaleRatio: 34.15597234, maleRatio: 65.84402766, femaleRatioColor: "#09156d", maleRatioColor: "orange"
            },
            {
                country: "United Arab Emirates", femaleRatio: 27.59638942, maleRatio: 72.40361058, femaleRatioColor: "#09156d", maleRatioColor: "orange"
            }
        ],
        maxRadius: 20,
    },
    {
        visible: true,
        bubbleType: 'Circle',
        opacity: 0.4,
        minRadius: 15,
        valuePath: "maleRatio",
        colorValuePath: "maleRatioColor",
        dataSource: [
            {
                country: "United States", femaleRatio: 50.50442726, maleRatio: 49.49557274, femaleRatioColor: "green", maleRatioColor: "blue"
            },
            {
                country: "India", femaleRatio: 48.18032713, maleRatio: 51.81967287, femaleRatioColor: "blue", maleRatioColor: "#c2d2d6"
            },
            {
                country: "Oman", femaleRatio: 34.15597234, maleRatio: 65.84402766, femaleRatioColor: "#09156d", maleRatioColor: "orange"
            },
            {
                country: "United Arab Emirates", femaleRatio: 27.59638942, maleRatio: 72.40361058, femaleRatioColor: "#09156d", maleRatioColor: "orange"
            }
        ],
        maxRadius: 25,
    }]
}]
});
map.appendTo('#element');
Copied to clipboard
<!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>

Enable tooltip for bubble

The tooltip for the bubbles can be enabled by setting the visible property of the tooltipSettings as true. MapsTooltip module must be injected into the Maps using the Maps.Inject(MapsTooltip) method to enable the tooltip in bubbles. The content for the tooltip can be set using the valuePath property in the tooltipSettings of the bubbleSettings where the value for the valuePath property is the field name from the data source of the bubbleSettings.

Source
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index.ts
index.html
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import { world_map } from './world-map.ts';
import { Maps, Bubble, MapsTooltip } from '@syncfusion/ej2-maps';
Maps.Inject(Bubble, MapsTooltip);
let map: Maps = new Maps({
layers: [{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    bubbleSettings: [{
        visible: true,
        minRadius: 5,
        dataSource: [
            { name: 'India', population: '38332521' },
            { name: 'New Zealand', population: '19651127' },
            { name: 'Pakistan', population: '3090416' }
        ],
        maxRadius: 80,
        valuePath: 'population',
         tooltipSettings: {
            visible: true,
            valuePath: 'population',
        },
    }]
}]
});
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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