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Provide custom data source and enabling filtering to DropDownList in JavaScript Grid control

You can provide data source to the DropDownList by using the columns.edit.params property.

While setting new data source using edit params, you must specify a new query property too for the dropdownlist as follows,

{
    params: {
        query: new Query(),
        dataSource: country,
        fields: { value: 'ShipCountry', text: 'ShipCountry' },
        allowFiltering: true
        }
}

You can also enable filtering for the dropdownlist by passing the allowFiltering as true to the edit params.

In the below demo, DropDownList is rendered with custom Datasource for the ShipCountry column and enabled filtering to search dropdownlist items.

Source
Preview
index.ts
index.html
import { Grid, Edit, Toolbar } from '@syncfusion/ej2-grids';
import { Query } from '@syncfusion/ej2-data';
import { data } from './datasource.ts';

Grid.Inject(Edit, Toolbar);

let country: { [key: string]: Object }[] = [
    { ShipCountry: 'United States', countryId: '1' },
    { ShipCountry: 'Australia', countryId: '2' },
    { ShipCountry: 'India', countryId: '2' }
];

let grid: Grid = new Grid({
    dataSource: data,
    toolbar: ['Add', 'Edit', 'Delete', 'Update', 'Cancel'],
    editSettings: { allowEditing: true, allowAdding: true, allowDeleting: true, mode: 'Normal' },
    columns: [
        { field: 'OrderID', headerText: 'Order ID', textAlign: 'Right', width: 100, isPrimaryKey: true, validationRules: { required: true } },
        { field: 'CustomerID', headerText: 'Customer ID', width: 120, validationRules: { required: true, minLength: 3 } },
        {
            field: 'ShipCountry', headerText: 'Ship Country', width: 120, editType: 'dropdownedit', edit: {
                params: {
                    query: new Query(),
                    dataSource: country,
                    fields: { value: 'ShipCountry', text: 'ShipCountry' },
                    allowFiltering: true
                }
            }
        }
    ],
    height: 265
});
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://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <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>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Grid'></div>        
    </div>
</body>
</html>