Selection in JavaScript (ES5) HeatMap Chart control

06 Jun 2023 / 2 minutes to read

In the HeatMap, the cell selection is used to select the single or multiple heat map cells at runtime and get the selected cell details using the cellSelected event. You can enable the cell selection using the allowSelection property.

Source

Preview

index.js

index.html

var heatmapData = [
     [73, 39, 26, 39, 94, 0],
     [93, 58, 53, 38, 26, 68],
     [99, 28, 22, 4, 66, 90],
     [14, 26, 97, 69, 69, 3],
     [7, 46, 47, 47, 88, 6],
     [41, 55, 73, 23, 3, 79],
     [56, 69, 21, 86, 3, 33],
     [45, 7, 53, 81, 95, 79],
     [60, 77, 74, 68, 88, 51],
     [25, 25, 10, 12, 78, 14],
     [25, 56, 55, 58, 12, 82],
     [74, 33, 88, 23, 86, 59]];

var heatmap = new ej.heatmap.HeatMap({
     titleSettings: {
            text: 'Sales Revenue per Employee (in 1000 US$)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
         cellSettings: {
            showLabel: true,
        },
        xAxis: {
            labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven', 
                        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
        },
        allowSelection: true,
        yAxis: {
            labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
        },
        dataSource: heatmapData,
});
heatmap.appendTo('#element');

<!DOCTYPE html><html lang="en"><head>
            
    <title>EJ2 HeatMap</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://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>

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

Enable single cell selection

In the HeatMap, the enableMultiSelect property is used to allow single cell selection. When you set the enableMultiSelect property to false, only one cell is selected. By default, enableMultiSelect property is set to true.

Source

Preview

index.js

index.html

var heatmapData = [
     [73, 39, 26, 39, 94, 0],
     [93, 58, 53, 38, 26, 68],
     [99, 28, 22, 4, 66, 90],
     [14, 26, 97, 69, 69, 3],
     [7, 46, 47, 47, 88, 6],
     [41, 55, 73, 23, 3, 79],
     [56, 69, 21, 86, 3, 33],
     [45, 7, 53, 81, 95, 79],
     [60, 77, 74, 68, 88, 51],
     [25, 25, 10, 12, 78, 14],
     [25, 56, 55, 58, 12, 82],
     [74, 33, 88, 23, 86, 59]];

var heatmap = new ej.heatmap.HeatMap({
     titleSettings: {
            text: 'Sales Revenue per Employee (in 1000 US$)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
         cellSettings: {
            showLabel: true,
        },
        xAxis: {
            labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven', 
                        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
        },
        allowSelection: true,
        enableMultiSelect: false,
        yAxis: {
            labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
        },
        dataSource: heatmapData,
});
heatmap.appendTo('#element');

<!DOCTYPE html><html lang="en"><head>
            
    <title>EJ2 HeatMap</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://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>

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