Angular PrimeNG TreeTable Sections

Last Updated : 07 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. It provides a lot of templates, components, theme design, an extensive icon library, and much more.

In this article, we are going to learn Angular PrimeNG TreeTable Sections. TreeTable is used to display hierarchical data in tabular format. The Sections are used to display additional details using the TreeTable templates like the footer, header, summary, or captions.

Syntax:

<p-treeTable [columns]="cols" [value]="tableData">
      <ng-template pTemplate="header">
        <tr>
              <th>Name</th>
              <th>Age</th>
        </tr>
      </ng-template>

      <ng-template pTemplate="summary">
        There are {{ tableData?.length }} entries
      </ng-template>
</p-treeTable>

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:

Project Structure

Example 1: In the following example, we have a TreeTable with different sections such as heading, body, and footer.

app.component.html

<h1 style="color: green; text-align:center;"> 
    GeeksforGeeks 
</h1> 
  
<h3>Angular PrimeNG TreeTable Sections</h3> 
  
<p-treeTable [columns]="cols" [value]="tableData"> 
    <ng-template pTemplate="header"> 
        <tr> 
            <th>Name</th> 
            <th>Age</th> 
        </tr> 
    </ng-template> 
  
    <ng-template pTemplate="body" 
        let-rowNode let-rowData="rowData" 
        let-columns="columns"> 
        <tr> 
            <td> 
                <p-treeTableToggler 
                    [rowNode]="rowNode"> 
                </p-treeTableToggler> 
                {{ rowData.name }} 
            </td> 
            <td>{{ rowData.age }}</td> 
            <td>{{ rowData.type }}</td> 
        </tr> 
    </ng-template> 
    <ng-template pTemplate="footer" let-columns> 
        <tr> 
            <td *ngFor="let col of columns"> 
                {{ col.header }} 
            </td> 
        </tr> 
    </ng-template> 
</p-treeTable>

app.component.ts

import { Component, OnInit, ViewChild } from '@angular/core'; 
import { NodeService } from './nodeservice'; 
import { TreeNode } from 'primeng/api'; 
import { TreeTable } from 'primeng/treetable'; 
import { MessageService } from 'primeng/api'; 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    providers: [MessageService], 
}) 
export class AppComponent { 
    tableData: TreeNode[]; 
  
    cols: any[]; 
  
    constructor(private messageService: MessageService) { } 
  
    ngOnInit() { 
        this.cols = [ 
            { field: 'name', header: 'First Name' }, 
            { field: 'age', header: 'Age' }, 
        ]; 
        this.tableData = [ 
            { 
                data: { 
                    name: 'A', 
                    age: '40', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'B', 
                            age: '16', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'C', 
                            age: '14', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'D', 
                    age: '55', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'E', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'F', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'G', 
                    age: '32', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'H', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'I', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'J', 
                    age: '64', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'K', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'L', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'M', 
                    age: '12', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'N', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'O', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'P', 
                    age: '34', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'Q', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'R', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'S', 
                    age: '43', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'T', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'U', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
        ]; 
    } 
}

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 { TreeTableModule } from 'primeng/treetable'; 
import { ButtonModule } from 'primeng/button'; 
import { InputTextModule } from 'primeng/inputtext'; 
import { ToastModule } from 'primeng/toast'; 
import { RippleModule } from 'primeng/ripple'; 
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        TreeTableModule, 
        ButtonModule, 
        InputTextModule, 
        HttpClientModule, 
        FormsModule, 
        ToastModule, 
        RippleModule, 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent], 
    providers: [NodeService], 
}) 
export class AppModule { }

Output:

Example 2: In the following example, we have a summary section that displays the number of entries.

app.component.html

<h1 style="color: green; text-align:center;"> 
    GeeksforGeeks 
</h1> 
  
<h3>Angular PrimeNG TreeTable Sections</h3> 
  
<p-treeTable [columns]="cols" [value]="tableData"> 
    <ng-template pTemplate="header"> 
        <tr> 
            <th>Name</th> 
            <th>Age</th> 
        </tr> 
    </ng-template> 
  
    <ng-template pTemplate="body" 
        let-rowNode let-rowData="rowData" 
        let-columns="columns"> 
        <tr> 
            <td> 
                <p-treeTableToggler 
                    [rowNode]="rowNode"> 
                </p-treeTableToggler> 
                {{ rowData.name }} 
            </td> 
            <td>{{ rowData.age }}</td> 
            <td>{{ rowData.type }}</td> 
        </tr> 
    </ng-template> 
    <ng-template pTemplate="summary"> 
        There are {{ tableData?.length }} entries 
    </ng-template> 
</p-treeTable>

app.component.ts

import { Component, OnInit, ViewChild } from '@angular/core'; 
import { NodeService } from './nodeservice'; 
import { TreeNode } from 'primeng/api'; 
import { TreeTable } from 'primeng/treetable'; 
import { MessageService } from 'primeng/api'; 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    providers: [MessageService], 
}) 
export class AppComponent { 
    tableData: TreeNode[]; 
  
    cols: any[]; 
  
    constructor(private messageService: MessageService) { } 
  
    ngOnInit() { 
        this.cols = [ 
            { field: 'name', header: 'First Name' }, 
            { field: 'age', header: 'Age' }, 
        ]; 
        this.tableData = [ 
            { 
                data: { 
                    name: 'A', 
                    age: '40', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'B', 
                            age: '16', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'C', 
                            age: '14', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'D', 
                    age: '55', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'E', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'F', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'G', 
                    age: '32', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'H', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'I', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'J', 
                    age: '64', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'K', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'L', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'M', 
                    age: '12', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'N', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'O', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'P', 
                    age: '34', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'Q', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'R', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
            { 
                data: { 
                    name: 'S', 
                    age: '43', 
                }, 
                children: [ 
                    { 
                        data: { 
                            name: 'T', 
                            age: '20', 
                        }, 
                    }, 
                    { 
                        data: { 
                            name: 'U', 
                            age: '24', 
                        }, 
                    }, 
                ], 
            }, 
        ]; 
    } 
}

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 { TreeTableModule } from 'primeng/treetable'; 
import { ButtonModule } from 'primeng/button'; 
import { InputTextModule } from 'primeng/inputtext'; 
import { ToastModule } from 'primeng/toast'; 
import { RippleModule } from 'primeng/ripple'; 
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        TreeTableModule, 
        ButtonModule, 
        InputTextModule, 
        HttpClientModule, 
        FormsModule, 
        ToastModule, 
        RippleModule, 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent], 
    providers: [NodeService], 
}) 
export class AppModule { }