You can create your own filtering UI by using column.filter property. The following example demonstrates the way to create a custom filtering UI in the foreign column.
In the following example, The Employee Name is a foreign key column. DropDownList is rendered using Filter UI.
ej.grids.Grid.Inject(ej.grids.ForeignKey, ej.grids.Filter);
var dropInstance;
var grid = new ej.grids.Grid({
dataSource: data.slice(0,10),
allowFiltering: true,
filterSettings: {type: 'Menu'},
columns: [
{ field: 'OrderID', headerText: 'Order ID', textAlign: 'Right', width: 100 },
{
field: 'EmployeeID', headerText: 'Employee Name', width: 150, foreignKeyValue: 'FirstName', dataSource: fEmployeeData,
filter: {
ui: {
create: function(args) {
let flValInput: HTMLElement = ej.base.createElement('input', { className: 'flm-input' });
args.target.appendChild(flValInput);
dropInstance = new ej.dropdowns.DropDownList({
dataSource: new ej.data.DataManager(fEmployeeData),
fields: { text: 'FirstName', value: 'EmployeeID' },
placeholder: 'Select a value',
popupHeight: '200px'
});
dropInstance.appendTo(flValInput);
},
write: function(arg) {
dropInstance.text = args.filteredValue || '';
},
read: function(args) {
args.fltrObj.filterByColumn(args.column.field, args.operator, dropInstance.text);
}
}
}
},
{ field: 'Freight', headerText: 'Freight', width: 100, textAlign: 'Right'},
{ field: 'ShipName', headerText: 'Ship Name', width: 180 }
],
height: 315
});
grid.appendTo('#Grid');<!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">
<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>