Close popup in Angular Drop down list component

15 Sep 20222 minutes to read

By using the hidePopup method in DropDownList, you can close the popup on scroll when triggered the windows scroll event.

The following example demonstrate about how to close the popup on scroll.

app.component.ts

import { Component, ViewChild } from '@angular/core';
import { DropDownListComponent } from '@syncfusion/ej2-angular-dropdowns';

@Component({
    selector: 'app-root',
    // specifies the template string for the DropDownList component with change event
    template: `<ejs-dropdownlist #ddlelement id='ddlelement' #samples [dataSource]='data' [placeholder]='placeholder'></ejs-dropdownlist>`
})
export class AppComponent {
    constructor() {
        // bind the onscroll event to window
        window.onscroll = () => {
            this.dropDownListObject.hidePopup();
        }
    }
    // defined the array of data
    public data: string[] = ['Badminton', 'Basketball', 'Cricket', 'Golf', 'Hockey', 'Rugby'];
    // set placeholder text to DropDownList input element
    public placeholder: string = 'Select a game';
    @ViewChild('ddlelement')
    public dropDownListObject: DropDownListComponent;
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { DropDownListModule } from '@syncfusion/ej2-angular-dropdowns';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,FormsModule, ReactiveFormsModule, DropDownListModule, ButtonModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

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