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Levels in JavaScript TreeMap control

27 Jul 2021 / 8 minutes to read

You can give ‘n’ number of levels to the tree map. Each level can be separated using the [groupPath] property.

The following customization options are available to customize the tree map levels.

Group path

The [groupPath] property is used to separate each level in tree map. The GroupPath accepts a field in dataSource.

Source
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index.ts
index.html
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let jobData:Object[] = [
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Marketing', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Management', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 100 },
    { Category: 'Employees', Country: 'India', JobDescription: 'HR Executives', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Accounts', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Marketing', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Management', EmployeesCount: 10 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Accounts', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'HR Executives', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Accounts', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Marketing', EmployeesCount: 100 }];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource: jobData,
    weightValuePath: 'EmployeesCount',
    levels: [
        { groupPath: 'Country', border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobDescription', border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobGroup', border: { color: 'black', width: 0.5 } },
    ]
}, '#container');
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <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="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Group gap

The [groupGap] property is used to separate an item from every group or another item to differentiate the levels mentioned in the tree map.

Source
Preview
index.ts
index.html
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let jobData:Object[] = [
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Marketing', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Management', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 100 },
    { Category: 'Employees', Country: 'India', JobDescription: 'HR Executives', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Accounts', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Marketing', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Management', EmployeesCount: 10 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Accounts', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'HR Executives', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Accounts', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Marketing', EmployeesCount: 100 }];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource: jobData,
    weightValuePath: 'EmployeesCount',
    levels: [
        { groupPath: 'Country', groupGap:10, border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobDescription', groupGap:10, border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobGroup', groupGap:10, border: { color: 'black', width: 0.5 } },
    ]
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <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="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Header format and alignment

You can customize header using the [headerFormat] property in which fields are mapping from the dataSource. You can also align header using the [headerAlignment] property.

Source
Preview
index.ts
index.html
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let jobData:Object[] = [
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Marketing', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Management', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 100 },
    { Category: 'Employees', Country: 'India', JobDescription: 'HR Executives', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Accounts', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Marketing', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Management', EmployeesCount: 10 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Accounts', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'HR Executives', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Accounts', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Marketing', EmployeesCount: 100 }];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource:jobData,
    weightValuePath: 'EmployeesCount',
    levels: [
        { groupPath: 'Country', headerFormat:'${Country}-${EmployeesCount}',
        headerAlignment:'Center', border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobDescription',headerFormat:'${JobDescription}-${EmployeesCount}', headerAlignment:'Far', border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobGroup', headerAlignment:'Near',
        headerFormat:'${JobGroup}-${EmployeesCount}', border: { color: 'black', width: 0.5 } },
    ]
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <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="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Header height and style

You can customize the font color, family, weight, and size using the [headerStyle] property. Based on font size, the header height can be given using the [headerHeight] property.

Source
Preview
index.ts
index.html
Copied to clipboard
let jobData:Object[] = [
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Marketing', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Management', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 100 },
    { Category: 'Employees', Country: 'India', JobDescription: 'HR Executives', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Accounts', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Marketing', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Management', EmployeesCount: 10 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Accounts', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'HR Executives', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Accounts', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Marketing', EmployeesCount: 100 }];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource: jobData,
    weightValuePath: 'EmployeesCount',
    levels: [
        { groupPath: 'Country', headerHeight:35, headerStyle:{ size:'15px' }, border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobDescription',headerHeight:45, headerStyle:{ size:'15px' }, border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobGroup',headerHeight:40, headerStyle:{ size:'15px' }, border: { color: 'black', width: 0.5 } },
    ]
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <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="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Header template and position

The treemap header supports to customize header of each item using the [headerTemplate] property. It uses Essential JS2 Template engine to render the elements. You can position the template using the [templatePosition] property.

The template concepts are illustrated in the following example.

Source
Preview
index.ts
index.html
Copied to clipboard
let jobData:Object[] = [
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Marketing', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'USA', JobDescription: 'Management', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 100 },
    { Category: 'Employees', Country: 'India', JobDescription: 'HR Executives', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'India', JobDescription: 'Accounts', EmployeesCount: 40 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Executive', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Sales', JobGroup: 'Analyst', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Marketing', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 80 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Management', EmployeesCount: 10 },
    { Category: 'Employees', Country: 'Germany', JobDescription: 'Accounts', EmployeesCount: 20 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 30 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'HR Executives', EmployeesCount: 50 },
    { Category: 'Employees', Country: 'UK', JobDescription: 'Accounts', EmployeesCount: 60 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Technical', JobGroup: 'Testers', EmployeesCount: 70 },
    { Category: 'Employees', Country: 'France', JobDescription: 'Marketing', EmployeesCount: 100 }];


import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource: jobData ,
    weightValuePath: 'EmployeesCount',
     levels: [
        { groupPath: 'Country',headerTemplate:'<div>{{Country}}</div>', headerPosition:'Center', border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobDescription',headerTemplate:'<div>{{JobDescription}}</div>', headerPosition:'Center', border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobGroup',headerTemplate:'<div>{{JobGroup}}</div>', headerPosition:'Far', border: { color: 'black', width: 0.5 } },
    ]
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <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="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>