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Hide the expand/collapse icon in parent row with no record in child grid

By default, the expand/collapse icon will be visible even if the child grid is empty.

You can use rowDataBound event to hide the icon when there is no record in child grid.

To hide the expand/collapse icon in parent row with no record in child grid, follow the given steps:

Step 1:

Create CSS class with custom style to override the default style of Grid.

    .e-row[aria-selected="true"] .e-customizedExpandcell {
        background-color: #e0e0e0;
    }

    .e-grid.e-gridhover tr[role='row']:hover {
        background-color: #eee;
    }

Step 2:

Add the CSS class to the Grid in the rowDataBound event handler of Grid.

    function rowDataBound(args:any):void{
        var filter = args.data.EmployeeID;
        var data = new DataManager(this.childGrid.dataSource).executeLocal(new Query().where("EmployeeID", "equal", parseInt(filter), true));
        if(data.length == 0) {
            //here hide which parent row has no child records
            args.row.querySelector('td').innerHTML=" ";
            args.row.querySelector('td').className = "e-customizedExpandcell";
        }
    }

In the below demo, the expand/collapse icon in the row with EmployeeID as 1 is hidden as it does not have record in child Grid.

Source
Preview
index.js
index.html
ej.base.enableRipple(true)

    var dataManger = [{Order:100, ShipName:'Berlin', EmployeeID:2},
    {Order:101, ShipName:'Capte', EmployeeID:3},
    {Order:102, ShipName:'Marlon', EmployeeID:4},
    {Order:103, ShipName:'Black pearl', EmployeeID:5},
    {Order:104, ShipName:'Pearl', EmployeeID:6},
    {Order:105, ShipName:'Noth bay', EmployeeID:7},
    {Order:106, ShipName:'baratna', EmployeeID:8},
    {Order:107, ShipName:'Charge', EmployeeID:9},
    ];
    var grid = new ej.grids.Grid({
        dataSource: window.employeeData,
        allowSorting: true,
        rowDataBound:rowDataBound,
        columns: [
            { field: 'EmployeeID', headerText: 'Employee ID', textAlign: 'Right', width: 125 },
            { field: 'FirstName', headerText: 'Name', width: 125 },
            { field: 'Title', headerText: 'Title', width: 180 },
            { field: 'City', headerText: 'City', width: 110 },
            { field: 'Country', headerText: 'Country', width: 110 }
        ],
        childGrid: {
            dataSource: dataManger,
            queryString: 'EmployeeID',
            allowPaging: true,
            columns: [
                { field: 'Order', headerText: 'Order ID', textAlign: 'Right', width: 120 },
                { field: 'EmployeeID', headerText: 'Employee ID', width: 120 },
                { field: 'ShipName', headerText: 'Ship Name', width: 150 }
            ],
        },
    });
    grid.appendTo('#Grid');
    function rowDataBound(args){
      var filter = args.data.EmployeeID;
      var data = new ej.data.DataManager(this.childGrid.dataSource).executeLocal(new ej.data.Query().where("EmployeeID", "equal", parseInt(filter), true));
      if (data.length == 0) {
       //here hide which parent row has no child records
          args.row.querySelector('td').innerHTML=" ";
          args.row.querySelector('td').className = "e-customizedExpandcell";
         
      }
    }
<!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-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">
    
    
    
    
    <style>
        .e-row[aria-selected="true"] .e-customizedExpandcell {
            background-color: #e0e0e0;
        }
        .e-grid.e-gridhover tr[role='row']:hover {
            background-color: #eee;
        }
        .e-expand::before {
        content: '\e5b8';
    }
    </style>
<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">
        <div id="Grid"></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>