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Provide custom data source and enabling filtering to DropDownList in Angular Grid component

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,

{
    this.countryParams = {
        params:   {
            allowFiltering: true,
            dataSource: this.country,
            fields: {text:'countryName',value:'countryName'},
            query: new Query(),
            actionComplete: () => false
            }
        }
}

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
app.component.ts
app.module.ts
main.ts
import { Component, OnInit } from '@angular/core';
import { DropDownList } from '@syncfusion/ej2-dropdowns';
import { Query, DataManager } from '@syncfusion/ej2-data';
import { cascadeData } from './datasource';
import { EditSettingsModel, ToolbarItems, IEditCell } from '@syncfusion/ej2-angular-grids';

@Component({
    selector: 'app-root',
    template: `<ejs-grid [dataSource]='data' [editSettings]='editSettings' [toolbar]='toolbar' height='273px'>
                <e-columns>
                    <e-column field='OrderID' headerText='Order ID' textAlign='Right' isPrimaryKey='true' width=100></e-column>
                    <e-column field='CustomerID' headerText='Customer ID' width=120></e-column>
                    <e-column field='ShipCountry' headerText='Ship Country' editType= 'dropdownedit'
                     [edit]='countryParams' width=150></e-column>
                </e-columns>
                </ejs-grid>`
})
export class AppComponent implements OnInit {

    public data: object[];
    public editSettings: EditSettingsModel;
    public toolbar: ToolbarItems[];
    public countryParams: IEditCell;

    public country: object[] = [
        { countryName: 'United States', countryId: '1' },
        { countryName: 'Australia', countryId: '2' },
        { countryName: 'India', countryId: '3' }
    ];

    ngOnInit(): void {
        this.data = cascadeData;
        this.editSettings = { allowEditing: true, allowAdding: true, allowDeleting: true };
        this.toolbar = ['Add', 'Edit', 'Delete', 'Update', 'Cancel'];
        this.countryParams = {
            params: {
                allowFiltering: true,
                dataSource: new DataManager(this.country),
                fields: { text: 'countryName', value: 'countryName' },
                query: new Query(),
                actionComplete: () => false
            }
        };
    }

}
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { BrowserModule } from '@angular/platform-browser';
import { GridModule, EditService, ToolbarService, SortService } from '@syncfusion/ej2-angular-grids';
import { AppComponent } from './app.component';
import { DatePickerAllModule } from '@syncfusion/ej2-angular-calendars';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        GridModule,
        DatePickerAllModule,
        FormsModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [EditService, ToolbarService, SortService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);