Angular PrimeNG TieredMenu Methods

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. It provides a lot of templates, components, theme design, an extensive icon library, and much more. In this article, we will see the Angular PrimeNG TieredMenu Methods.

The TieredMenu component allows the creation of the menu in the form of a tier. It displays submenus in nested overlays. The TieredMenu Methods are used to display or hide or toggle the visibility of the menu.

Angular PrimeNG TieredMenu Methods:

• toggle: It is used to toggle the visibility of the popup menu.
• show: It is used to display the popup menu.
• hide: It is used to hide the popup menu.

Syntax:

// For app.component.html
<p-tieredMenu #menu [model]="items" 
                    [popup]="true">
</p-tieredMenu>
<button #btn type="button" pButton 
        icon="pi pi-fw pi-list" 
        label="Show" 
        (click)="handleClick($event)">
</button>

// For app.component.ts
handleClick(event) {
  this.menu.show(event);
}

Creating Angular application & Module Installation:

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

ng new geeks_angular

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

cd geeks_angular

Step 3: Install PrimeNG in your given directory.

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

Project Structure: The project structure will look like the following:

Example 1: In the following example, we have a TieredMenu with a show button. This calls the show() method.

• app.component.html

HTML

<h1 style="color: green; text-align:center;">
    GeeksforGeeks
</h1>

<h3>Angular PrimeNG TieredMenu Methods</h3>

<p-tieredMenu #menu [model]="items" [popup]="true">
</p-tieredMenu>
<button #btn type="button" pButton
        icon="pi pi-fw pi-list"
        label="Show"
        (click)="handleClick($event)">
</button>

• app.component.ts

Javascript

import { Component, OnInit, ViewEncapsulation, ViewChild }
    from '@angular/core';
import { MenuItem } from 'primeng/api';
import { SlideMenu } from 'primeng/slidemenu';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css'],
})
export class AppComponent {
    items: MenuItem[];
    @ViewChild('menu') menu!: SlideMenu;
    ngOnInit() {
        this.items = [
            {
                label: 'Data Structures',
                items: [
                    {
                        label: 'Linked List',
                        items: [
                            {
                                label: 'Singly Linked List',
                            },
                            {
                                label: 'Doubly Linked List',
                            },
                        ],
                    },
                    {
                        label: 'Trie',
                    },
                    {
                        label: 'Array',
                    },
                ],
            },
            {
                label: 'Algorithms',
                items: [
                    {
                        label: 'Sorting',
                    },
                    {
                        label: 'Searching',
                    },
                ],
            },
            {
                label: 'Development',

                items: [
                    {
                        label: 'Android',
                    },
                    {
                        label: 'Web development',
                    },
                ],
            },
        ];
    }
    handleClick(event) {
        this.menu.show(event);
    }
}

• app.module.ts

Javascript

import { NgModule } from '@angular/core';
import { BrowserModule }
    from '@angular/platform-browser';
import { BrowserAnimationsModule }
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { TieredMenuModule } from 'primeng/tieredmenu';
import { ButtonModule } from 'primeng/button';

@NgModule({
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        TieredMenuModule,
        ButtonModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})

export class AppModule { }

Output:

Example 2: In the following example, we have Show Button and a Toggle button with their respective functions.

• app.component.html

HTML

<h1 style="color: green;
           text-align:center;">
    GeeksforGeeks
</h1>

<h3>Angular PrimeNG TieredMenu Methods</h3>

<p-tieredMenu #menu [model]="items"
                    [popup]="true">
</p-tieredMenu>
<button #btn type="button" pButton
             icon="pi pi-fw pi-list"
             label="Show"
             (click)="showClick($event)">
</button>

<button #btn type="button" pButton
             icon="pi pi-fw pi-list"
             label="Toggle"
             (click)="toggleClick($event)">
</button>

• app.component.ts

Javascript

import { Component, OnInit, ViewEncapsulation, ViewChild }
    from '@angular/core';
import { MenuItem } from 'primeng/api';
import { SlideMenu } from 'primeng/slidemenu';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css'],
})
export class AppComponent {
    items: MenuItem[];
    @ViewChild('menu') menu!: SlideMenu;
    ngOnInit() {
        this.items = [
            {
                label: 'Data Structures',
                items: [
                    {
                        label: 'Linked List',
                        items: [
                            {
                                label: 'Singly Linked List',
                            },
                            {
                                label: 'Doubly Linked List',
                            },
                        ],
                    },
                    {
                        label: 'Trie',
                    },
                    {
                        label: 'Array',
                    },
                ],
            },
            {
                label: 'Algorithms',
                items: [
                    {
                        label: 'Sorting',
                    },
                    {
                        label: 'Searching',
                    },
                ],
            },
            {
                label: 'Development',

                items: [
                    {
                        label: 'Android',
                    },
                    {
                        label: 'Web development',
                    },
                ],
            },
        ];
    }
    showClick(event) {
        this.menu.show(event);
    }
    toggleClick(event) {
        this.menu.toggle(event);
    }
}

• app.module.ts

Javascript

import { NgModule } from '@angular/core';
import { BrowserModule }
    from '@angular/platform-browser';
import { BrowserAnimationsModule }
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { TieredMenuModule } from 'primeng/tieredmenu';
import { ButtonModule } from 'primeng/button';

@NgModule({
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        TieredMenuModule,
        ButtonModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})

export class AppModule { }

Output:

Reference: http://primefaces.org/primeng/tieredmenu