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. This article will show us how to use the Tree Scroll in Angular PrimeNG.
Angular PrimeNG Tree Scroll is used to enable scroll in the Tree Component. Scroller is an efficient approach to handling data effectively. We can easily add a scroller to show the data in a scrollable way.
Syntax:
<p-tree
[value]="..."
scrollHeight="...">
</p-tree>
Angular PrimeNG Tree Scroll properties:
- scrollHeight: It is used to define the height of the scrollable viewport. It is a string type and its default value is null.
- value: It is used to define the array of all the tree nodes. It is an array type and its default value is null.
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: It will look like the following:
Example 1: Below is a simple example demonstrating the use of the Angular PrimeNG TreeTable Scroll.
- app.component.html
HTML
<h2 style="color: green">GeeksforGeeks</h2>
<h4>Angular PrimeNG Tree Scroll</h4>
<p-tree [value]="files1" scrollHeight="300px"> </p-tree>
|
- app.component.ts
Javascript
import { Component, OnInit } from '@angular/core';
import { TreeNode } from 'primeng/api';
@Component({ selector: 'app-root',
templateUrl: './app.component.html',
}) export class AppComponent { files1: TreeNode[] = [];
constructor() { }
ngOnInit() {
this.files1 = [
{ label: 'Z', icon: 'pi pi-folder' },
{ label: 'A', icon: 'pi pi-folder' },
{ label: 'D', icon: 'pi pi-folder' },
{ label: 'C', icon: 'pi pi-folder' },
{ label: 'W', icon: 'pi pi-folder' },
{ label: 'E', icon: 'pi pi-folder' },
{ label: 'R', icon: 'pi pi-folder' },
{ label: 'G', icon: 'pi pi-folder' },
{ label: 'K', icon: 'pi pi-folder' },
{
label: 'A',
icon: 'pi pi-folder',
children: [
{
label: 'B',
icon: 'pi pi-folder',
children: [
{
label: 'C',
icon: 'pi pi-folder',
},
{
label: 'D',
icon: 'pi pi-folder',
},
],
},
{
label: 'E',
icon: 'pi pi-folder',
children: [
{
label: 'F',
icon: 'pi pi-folder',
},
],
},
],
},
{
label: 'G',
icon: 'pi pi-folder',
children: [
{
label: 'H',
icon: 'pi pi-folder',
},
{
label: 'I',
icon: 'pi pi-folder',
},
{
label: 'J',
icon: 'pi pi-folder',
},
],
},
];
}
} |
- app.module.ts
Javascript
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { TreeModule } from 'primeng/tree';
import { ButtonModule } from 'primeng/button';
import { InputTextModule } from 'primeng/inputtext';
import { VirtualScrollerModule } from 'primeng/virtualscroller';
@NgModule({ imports: [
BrowserModule,
BrowserAnimationsModule,
TreeModule,
ButtonModule,
InputTextModule,
HttpClientModule,
FormsModule,
VirtualScrollerModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [],
}) export class AppModule { } |
Output:
Example 2: Below is a simple example demonstrating the use of the Angular PrimeNG TreeTable Scroll.
- app.component.html
HTML
<h2 style="color: green">GeeksforGeeks</h2>
<h4>Angular PrimeNG Tree Scroll</h4>
<p-tree [value]="files1" scrollHeight="200px"> </p-tree>
|
- app.component.ts
Javascript
import { Component, OnInit } from '@angular/core';
import { TreeNode } from 'primeng/api';
@Component({ selector: 'app-root',
templateUrl: './app.component.html',
}) export class AppComponent { files1: TreeNode[] = [];
constructor() { }
ngOnInit() {
this.files1 = [
{ label: 'Z', icon: 'pi pi-folder' },
{ label: 'A', icon: 'pi pi-folder' },
{ label: 'D', icon: 'pi pi-folder' },
{ label: 'C', icon: 'pi pi-folder' },
{ label: 'W', icon: 'pi pi-folder' },
{ label: 'E', icon: 'pi pi-folder' },
{ label: 'R', icon: 'pi pi-folder' },
{ label: 'G', icon: 'pi pi-folder' },
{ label: 'K', icon: 'pi pi-folder' },
{
label: 'A',
icon: 'pi pi-folder',
children: [
{
label: 'B',
icon: 'pi pi-folder',
children: [
{
label: 'C',
icon: 'pi pi-folder',
},
{
label: 'D',
icon: 'pi pi-folder',
},
],
},
{
label: 'E',
icon: 'pi pi-folder',
children: [
{
label: 'F',
icon: 'pi pi-folder',
},
],
},
],
},
{
label: 'G',
icon: 'pi pi-folder',
children: [
{
label: 'H',
icon: 'pi pi-folder',
},
{
label: 'I',
icon: 'pi pi-folder',
},
{
label: 'J',
icon: 'pi pi-folder',
},
],
},
];
}
} |
- app.module.ts
Javascript
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { TreeModule } from 'primeng/tree';
import { ButtonModule } from 'primeng/button';
import { InputTextModule } from 'primeng/inputtext';
import { VirtualScrollerModule } from 'primeng/virtualscroller';
@NgModule({ imports: [
BrowserModule,
BrowserAnimationsModule,
TreeModule,
ButtonModule,
InputTextModule,
HttpClientModule,
FormsModule,
VirtualScrollerModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [],
}) export class AppModule { } |
Output:
Reference: https://primefaces.org/primeng/tree/scroll