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Use Edit Template in Foreign Key Column

By default, the foreign key column uses the drop-down component for editing. You can render other than the drop-down component by using the column.edit property. The following example demonstrates the way of using edit template in the foreign column.

In the following code example, the Employee Name is a foreign key column. When editing, the AutoComplete component is rendered instead of drop-down list.

Source
Preview
index.ts
index.html
import { createElement } from '@syncfusion/ej2-base';
import { Grid, ForeignKey, Edit, Toolbar } from '@syncfusion/ej2-grids';
import { AutoComplete } from '@syncfusion/ej2-dropdowns';
import { DataManager, Query } from '@syncfusion/ej2-data';
import { data, employeeData } from './datasource.ts';

Grid.Inject(ForeignKey, Edit, Toolbar);

let autoComplete: AutoComplete;

let grid: Grid = new Grid(
        {
            dataSource: data,
            editSettings: { allowEditing: true },
            toolbar: ['Edit', 'Update', 'Cancel'],
            columns: [
                { field: 'OrderID', headerText: 'Order ID', textAlign: 'Right', width: 100, isPrimaryKey: true },
                // Foreign column
                {
                    field: 'EmployeeID', headerText: 'Employee Name', width: 150, foreignKeyValue: 'LastName', dataSource: employeeData,
                    edit: {
                            create: () => { // to create input element
                                return createElement('input');
                            },
                            read: () => { // return edited value to update data source
                                let value: Object[] = new DataManager(employeeData).executeLocal(new Query().where('LastName', 'equal', autoComplete.value));
                                return value.length && value[0]['EmployeeID']; // to convert foreign key value to local value.
                            },
                            destroy: () => { // to destroy the custom component.
                                autoComplete.destroy();
                            },
                            write: (args: { rowData: Object, column: Column, foreignKeyData: Object }) => { // to show the value for custom component
                                autoComplete = new AutoComplete({
                                    dataSource: employeeData,
                                    fields: { value: args.column.foreignKeyValue },
                                    value: args.foreignKeyData[0][args.column.foreignKeyValue]
                                });
                                autoComplete.appendTo(args.element);
                            }
                        }
                },
                { field: 'Freight', headerText: 'Freight', width: 100, textAlign: 'Right'},
                { field: 'ShipName', headerText: 'Ship Name', width: 180 }
            ],
            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>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Grid'></div>        
    </div>
</body>
</html>