JavaScript (ES5)
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Change column header Text dynamically in JavaScript (ES5) TreeGrid control

You can change the column headerText dynamically through an external button.

Follow the given steps to change the header text dynamically:

Step 1:

Get the column object corresponding to the field name by using the getColumnByField method. Then, change the header text value.

let column = treegrid.getColumnByField("taskName"); // Get column object.
column.headerText = 'Changed Text';

Step 2:

To reflect the changes in the treegrid header, invoke the refreshColumns method.

treegrid.refreshColumns();
Source
Preview
index.js
index.css
index.html
var treegrid = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    treeColumnIndex: 1,
    columns: [
     { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right' },
     { field: 'taskName', headerText: 'Task Name', width: 180, textAlign: 'Left' },
     { field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd'},
     { field: 'duration', headerText: 'Duration', width: 80, textAlign: 'Right' }
    ],
});
treegrid.appendTo('#TreeGrid');

var button = new ej.buttons.Button({}, '#change-text');

document.getElementById('change-text').addEventListener('click', () => { // changing the header text for taskName column.

   var column = treegrid.getColumnByField("taskName"); // get the JSON object of the column corresponding to the field name.
    column.headerText = "Changed Text"; // assign a new header text to the column.
    treegrid.refreshColumns();
});
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <button id="change-text"> Change Header Text</button>
        <div id="TreeGrid"></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>
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