Angular PrimeNG Tree Icons

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 Tree Icons in Angular PrimeNG.

Angular PrimeNG Tree Icons are used to display icons along with the tree element. If different icons are required for the expanded and collapsed state of the tree node the expandedIcon and collapsedIcon properties can be used.

Syntax:

<p-tree [value]="..."></p-tree>

// In treeNode
{
    label: 'A',
    icon: 'pi pi-folder',
}

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:

Project Structure

Example 1: Below is a simple example that demonstrates the use of the Angular PrimeNG Tree, In this example, we are making a Tree Component with a simple icon.

app.component.html

<h2 style="color: green;">
    GeeksforGeeks
</h2>
<h4>Angular PrimeNG Tree Icon</h4>
<p-tree [value]="files1"></p-tree>

app.component.ts

import { Component, OnInit } from '@angular/core';
import { NodeService } from './nodeservice';
import { TreeNode } from 'primeng/api';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  files1: TreeNode[];

  constructor(private nodeService: NodeService) {}

  ngOnInit() {
    this.files1 = [
      {
        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

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 { NodeService } from './nodeservice';
import { TreeModule } from 'primeng/tree';
import { ButtonModule } from 'primeng/button';
import { InputTextModule } from 'primeng/inputtext';

@NgModule({
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    TreeModule,
    ButtonModule,
    InputTextModule,
    HttpClientModule,
    FormsModule,
  ],
  declarations: [AppComponent],
  bootstrap: [AppComponent],
  providers: [NodeService],
})
export class AppModule {}

Output:

Example 2: Below is a simple example that demonstrates the use of the Angular PrimeNG Tree, In this example, we are using collapsedIcon and expandedIcon property to make icons behave along with the action particularly.

app.component.html

<h2 style="color: green">GeeksforGeeks</h2>
<h4>Angular PrimeNG Tree Icon</h4>
<p-tree [value]="files1"></p-tree>

app.component.ts

import { Component, OnInit } from '@angular/core';
import { NodeService } from './nodeservice';
import { TreeNode } from 'primeng/api';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
})
export class AppComponent {
    files1: TreeNode[] = [];

    constructor(private nodeService: NodeService) { }

    ngOnInit() {
        this.files1 = [
            {
                label: 'A',
                expandedIcon: 'pi pi-folder-open',
                collapsedIcon: 'pi pi-folder',
                children: [
                    {
                        label: 'B',
                        expandedIcon: 'pi pi-folder-open',
                        collapsedIcon: 'pi pi-folder',
                        children: [
                            {
                                label: 'C',
                                icon: 'pi pi-folder',
                            },
                            {
                                label: 'D',
                                icon: 'pi pi-folder',
                            },
                        ],
                    },
                    {
                        label: 'E',
                        expandedIcon: 'pi pi-folder-open',
                        collapsedIcon: 'pi pi-folder',
                        children: [
                            {
                                label: 'F',
                                icon: 'pi pi-folder',
                            },
                        ],
                    },
                ],
            },
            {
                label: 'G',
                collapsedIcon: 'pi pi-folder',
                expandedIcon: 'pi pi-folder-open',
                children: [
                    {
                        label: 'H',
                        icon: 'pi pi-folder',
                    },
                    {
                        label: 'I',
                        icon: 'pi pi-folder',
                    },
                    {
                        label: 'J',
                        icon: 'pi pi-folder',
                    },
                ],
            },
        ];
    }
}

app.module.ts

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 { NodeService } from './nodeservice';
import { TreeModule } from 'primeng/tree';
import { ButtonModule } from 'primeng/button';
import { InputTextModule } from 'primeng/inputtext';

@NgModule({
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        TreeModule,
        ButtonModule,
        InputTextModule,
        HttpClientModule,
        FormsModule,
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [NodeService],
})
export class AppModule { }

Output:

Reference: https://primefaces.org/primeng/tree