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Levels in JavaScript (ES5) TreeMap control

17 Sep 2021 / 8 minutes to read

TreeMap supports n number of levels and each level is separated by using the groupPath property.

Group path

The groupPath property is used to separate each level of the TreeMap by specifying the property from the data source.

In the following example, three levels are added and each level is configured using the groupPath property.

Source
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index.js
index.html
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var treemap = new ej.treemap.TreeMap({
  
 palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource:  [
        { 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 }
    ],
    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://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
    </div>


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

Group gap

The groupGap property is used to separate an item from each group or another item to differentiate the levels mentioned in the TreeMap.

Source
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index.js
index.html
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var treemap = new ej.treemap.TreeMap({
  
 palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource:  [
        { 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 }
    ],
    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://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
    </div>


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

Header format and Alignment

Customize header using the headerFormat property in which fields are mapping from the dataSource and align header using the headerAlignment property.

Source
Preview
index.js
index.html
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var treemap = new ej.treemap.TreeMap({
  
 palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource:  [
        { 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 }
    ],
    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://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
    </div>


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

Header height and style

Customize the font color, family, weight, opacity and size using the headerStyle. Based on the font settings, the header height is given using the headerHeight property in levels.

Source
Preview
index.js
index.html
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var treemap = new ej.treemap.TreeMap({
  
 palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource:  [
        { 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 }
    ],
    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://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
    </div>


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

Source
Preview
index.js
index.html
Copied to clipboard
var treemap = new ej.treemap.TreeMap({
  
 palette: ["#f44336", "#29b6f6", "#ab47bc", "#ffc107", "#5c6bc0", "#009688"],
    dataSource:  [
        { 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 }
    ],
    weightValuePath: 'EmployeesCount',
     levels: [
        { groupPath: 'Country', headerFormat:' ', headerTemplate:'<div>{{:Country}}- {{:EmployeesCount}}</div>',  border: { color: 'black', width: 0.5 } },{ groupPath: 'JobDescription', headerFormat:' ', headerTemplate:'<div>{{:JobDescription}}</div>',  border: { color: 'black', width: 0.5 } },
        { groupPath: 'JobGroup', headerFormat:' ', headerTemplate:'<div>{{:JobGroup}}</div>', border: { color: 'black', width: 0.5 } },
    ],
    leafItemSettings:{
      showLabels:false
    }
}, '#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://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
    </div>


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