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Create a table in tooltip in JavaScript (ES5) HeatMap Chart control

You can show a tooltip as a table using the template property in tooltipSettings.

The following steps describe how to show the table tooltip.

Step 1:

Initialize the tooltip template div as shown in the following html page.

<script id="tooltipTemplate" type="text/x-template">
    <div id='templateWrap'>
        <table style="width:100%;  border: 1px solid black;">
        <tr><td bgcolor="#00FFFF">${xValue}:</td><td bgcolor="#00FFFF">${yValue}</td><td bgcolor="#00FFFF">${value}</td></tr>
        </table>
    </div>
</script>

Step 2:

Set the element id to the template property in tooltipSettings to show the tooltip template.

Source
Preview
index.js
index.html
var heatmapData = [
    [0.72, 0.71, 0.71, 0.67, 0.72, 0.53, 0.53, 0.56, 0.58, 0.56],
    [2.28, 2.29, 2.09, 1.84, 1.64, 1.49, 1.49, 1.39, 1.32, 1.23],
    [2.02, 2.17, 2.30, 2.39, 2.36, 2.52, 2.62, 2.57, 2.57, 2.74],
    [3.21, 3.26, 3.45, 3.47, 3.42, 3.34, 3.14, 2.83, 2.64, 2.61],
    [3.22, 3.13, 3.04, 2.95, 2.69, 2.49, 2.27, 2.18, 2.06, 1.87],
    [3.30, 3.39, 3.40, 3.48, 3.60, 3.67, 3.73, 3.79, 3.79, 4.07],
    [5.80, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.00, 5.35, 5.47],
    [6.91, 7.40, 8.13, 8.80, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]
];

var heatmap = new ej.heatmap.HeatMap({
      titleSettings: {
            text: 'Crude Oil Production of Non-OPEC Countries (in Million barrels per day)',
            textStyle: {
                size: '15px',
                fontWeight: 500,
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
        xAxis: {
            labels: ['Canada', 'China', 'Egypt', 'Mexico', 'Norway', 'Russia', 'UK', 'USA']
        },
        yAxis: {
             labels: ['2000', '2001', '2002', '2003', '2004', '2005', '2006', '2007', '2008', '2009', '2010'],
        },
        cellSettings: {
            showLabel: false,
        },
        dataSource: heatmapData, 
        tooltipSettings:{
            template:'#tooltipTemplate'
        },
        showTooltip:true
});
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/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <script id="tooltipTemplate" type="text/x-template">
        <div id='templateWrap'>
            <table style="width:100%;  border: 1px solid black;">      
            <tr><td bgcolor="#00FFFF">${xValue}:</td><td bgcolor="#00FFFF">${yValue}</td><td bgcolor="#00FFFF">${value}</td></tr>
            </table>
        </div>
    </script>
    
    <div id="container">
        <div id="element">
        </div>
    </div>
    <style>
        table,
        th,
        td {
            border: 1px solid rgb(105, 105, 105);
            border-collapse: collapse;
        }
    </style>


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