Custom tool tip for columns in EJ2 TypeScript Treegrid control

27 Apr 20235 minutes to read

You can show the tooltip content in Tree Grid using [queryCellInfo] event of Tree Grid.

In the below demo, hover over the cell shows the tooltip content .

index.ts
index.html
import { TreeGrid, Page,QueryCellInfoEventArgs } from '@syncfusion/ej2-treegrid';
import { Tooltip } from '@syncfusion/ej2-popups';
import { sampleData } from './datasource.ts';

TreeGrid.Inject(Page);

    let treegrid: TreeGrid = new TreeGrid(
        {
            dataSource: sampleData,
            childMapping: 'subtasks',
            allowPaging: true,
            queryCellInfo: tooltip,
            pageSettings: {pageSize: 10},
            treeColumnIndex: 1,
            columns: [
                { field: 'taskID', headerText: 'Task ID', width: 70, textAlign: 'Right' },
                { field: 'taskName', headerText: 'Task Name', width: 200, textAlign: 'Left' },
                { field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd' },
                { field: 'endDate', headerText: 'End Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd' },
                { field: 'duration', headerText: 'Duration', width: 80, textAlign: 'Right' },
                { field: 'priority', headerText: 'Priority', width: 90 }
            ]  
        });
    treegrid.appendTo('#TreeGrid');

    function tooltip(args: QueryCellInfoEventArgs): void { // event triggers on every cell render.
    let tooltip: Tooltip = new Tooltip({
        content: args.data[args.column.field].toString() // add Essential JS2 tooltip for every cell.
    }, <HTMLElement>args.cell);
}
<!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="https://cdn.syncfusion.com/ej2/27.2.2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>        
    </div>
</body>
</html>

You can refer to our JavaScript Tree Grid feature tour page for its groundbreaking feature representations. You can also explore our JavaScript Tree Grid example JavaScript Tree Grid example to knows how to present and manipulate data.