Angular PrimeNG Form Dropdown Group Component

Last Updated : 18 Oct, 2022

Angular PrimeNG is an open-source framework with a rich set of native Angular UI components that are used for great styling and this framework is used to make responsive websites with very much ease. In this article, we will know how to use the calendar component in angular ngx bootstrap.

Dropdown Group Component: It is used for creating groups of options.

Syntax:

<p-dropdown [group]="true">
    <ng-template let-group pTemplate="group">
        <div class="p-d-flex p-ai-center">
            <span>{{group.label}}</span>
        </div>
    </ng-template>
</p-dropdown>

Creating Angular Application & Module Installation:

Step 1: Create an Angular application using the following command.

ng new appname

Step 2: After creating your project folder i.e. appname, move to it using the following command.

cd appname

Step 3: Install PrimeNG in your given directory.

npm install primeng --save
npm install primeicons --save

Project Structure:

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <title>GFG</title> 
    <style> 
        body { 
            background-color: lightgrey; 
            height: 550px; 
            width: 100%; 
        } 
    </style> 
</head> 
  
<body> 
    <div style="text-align:center;"> 
        <h1 style="color:green;"> 
            GeeksforGeeks 
        </h1> 
        <h3> 
            A computer science portal for geeks 
        </h3> 
        <h4> 
            Angular PrimeNG Form Dropdown Group Component 
        </h4> 
        <h5>Single</h5> 
        <p-dropdown 
            [options]="cities"  
            [(ngModel)]="selectedCity1"  
            placeholder="Select a City" 
            optionLabel="name"
            [showClear]="true"></p-dropdown> 
    </div> 
</body> 
</html>

app.component.ts

Javascript

import { Component } from '@angular/core'; 
import { MenuItem } from 'primeng/api'; 
import { SelectItem } from 'primeng/api'; 
import { SelectItemGroup } from 'primeng/api'; 
  
interface City { 
    name: string; 
    code: string; 
} 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.scss'], 
}) 
export class AppComponent { 
    cities: City[]; 
  
    selectedCity1: City; 
  
    selectedCity2: City; 
  
    selectedCity3: string; 
  
    selectedCountry: string; 
  
    countries: any[]; 
  
    groupedCities: SelectItemGroup[]; 
  
    items: SelectItem[]; 
  
    item: string; 
  
    constructor() { 
        this.items = []; 
        for (let i = 1; i <= 10; i++) { 
            this.items.push( 
                {  
                    label: 'GeeksforGeeks ' + i, value: 'Item ' + i  
                }); 
        } 
  
        this.cities = [ 
            { name: 'India', code: 'NY' }, 
            { name: 'Rome', code: 'RM' }, 
            { name: 'London', code: 'LDN' }, 
            { name: 'Istanbul', code: 'IST' }, 
            { name: 'Paris', code: 'PRS' }, 
        ]; 
    } 
}

app.module.ts

Javascript

import { NgModule } from '@angular/core'; 
import { BrowserModule } from '@angular/platform-browser'; 
import { FormsModule } from '@angular/forms'; 
import { BrowserAnimationsModule } from '@angular/platform-browser/animations'; 
import { AppComponent } from './app.component'; 
import { DropdownModule } from 'primeng/dropdown'; 
  
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        DropdownModule, 
        FormsModule 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent] 
}) 
  
export class AppModule { }

app.component.scss

:host ::ng-deep .p-dropdown {
     width: 14rem;
}

Output:

Example 2: In the below code, we will be using the above syntax to demonstrate the use of Angular PrimeNG Form Dropdown Group Component.

app.component.html

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <title>GFG</title> 
    <style> 
        body { 
            background-color: lightgrey; 
            height: 550px; 
            width: 100%; 
        } 
    </style> 
</head> 
  
<body> 
    <div style="text-align:center;"> 
        <h1 style="color:green;"> 
            GeeksforGeeks 
        </h1> 
        <h3> 
            A computer science portal for geeks 
        </h3> 
        <h4> 
            Angular PrimeNG Form Dropdown Group Component 
        </h4> 
        <h5>Grouped</h5> 
        <p-dropdown 
            [options]="groupedCities"  
            [(ngModel)]="selectedCity3"  
            placeholder="Select a City" 
            [group]="true"> 
            <ng-template let-group pTemplate="group"> 
                <div class="p-d-flex p-ai-center"> 
                    <span>{{ group.label }}</span> 
                </div> 
            </ng-template> 
        </p-dropdown> 
    </div> 
</body> 
</html>

app.component.ts

Javascript

import { Component } from '@angular/core'; 
import { MenuItem } from 'primeng/api'; 
import { SelectItem } from 'primeng/api'; 
import { SelectItemGroup } from 'primeng/api'; 
  
interface City { 
    name: string, 
    code: string 
} 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.scss'] 
}) 
export class AppComponent { 
  
    cities: City[]; 
  
    selectedCity1: City; 
  
    selectedCity2: City; 
  
    selectedCity3: string; 
  
    selectedCountry: string; 
  
    countries: any[]; 
  
    groupedCities: SelectItemGroup[]; 
  
    items: SelectItem[]; 
  
    item: string; 
  
    constructor() { 
        this.items = []; 
        for (let i = 0; i < 10000; i++) { 
            this.items.push({  
                label: 'Item ' + i, value: 'Item ' + i  
            }); 
        } 
  
        this.cities = [ 
            { name: 'India', code: 'NY' }, 
            { name: 'Rome', code: 'RM' }, 
            { name: 'London', code: 'LDN' }, 
            { name: 'Istanbul', code: 'IST' }, 
            { name: 'Paris', code: 'PRS' } 
        ]; 
  
        this.groupedCities = [ 
            { 
                label: 'India', value: 'IND', 
                items: [ 
                    { label: 'Mumbai', value: 'Mumbai' }, 
                    { label: 'Varanasi', value: 'Varanasi' }, 
                    { label: 'Nashik', value: 'Nashik' }, 
                    { label: 'Delhi', value: 'Delhi' } 
                ] 
            }, 
            { 
                label: 'USA', value: 'us', 
                items: [ 
                    { label: 'Chicago', value: 'Chicago' }, 
                    { label: 'Los Angeles', value: 'Los Angeles' }, 
                    { label: 'New York', value: 'New York' }, 
                    { label: 'San Francisco', value: 'San Francisco' } 
                ] 
            }, 
            { 
                label: 'Japan', value: 'jp', 
                items: [ 
                    { label: 'Kyoto', value: 'Kyoto' }, 
                    { label: 'Osaka', value: 'Osaka' }, 
                    { label: 'Tokyo', value: 'Tokyo' }, 
                    { label: 'Yokohama', value: 'Yokohama' } 
                ] 
            } 
        ]; 
  
        this.countries = [ 
            { name: 'Australia', code: 'AU' }, 
            { name: 'Brazil', code: 'BR' }, 
            { name: 'China', code: 'CN' }, 
            { name: 'Egypt', code: 'EG' }, 
            { name: 'France', code: 'FR' }, 
            { name: 'Germany', code: 'DE' }, 
            { name: 'India', code: 'IN' }, 
            { name: 'Japan', code: 'JP' }, 
            { name: 'Spain', code: 'ES' }, 
            { name: 'United States', code: 'US' } 
        ]; 
    } 
}

app.module.ts

Javascript

import { NgModule } from '@angular/core'; 
import { BrowserModule } from '@angular/platform-browser'; 
import { FormsModule } from '@angular/forms'; 
import { BrowserAnimationsModule } from '@angular/platform-browser/animations'; 
import { AppComponent } from './app.component'; 
import { DropdownModule } from 'primeng/dropdown'; 
  
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        DropdownModule, 
        FormsModule 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent] 
}) 
  
export class AppModule { }

app.component.scss

:host ::ng-deep .p-dropdown {
    width: 14rem;
}

Output:

Reference: https://www.primefaces.org/primeng/dropdown

Suggest improvement

Angular PrimeNG Form Dropdown Basic Component

Angular PrimeNG Form Dropdown Advanced with Templating, Filtering and Clear Icon Component

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