Angular PrimeNG TreeTable Column Reordering

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 TreeTable Column Reordering in Angular PrimeNG.

Angular PrimeNG TreeTable Column Reordering enables the reordering of columns in the TreeTable component. Columns can be reordered according to the user’s needs, making the table More Interactive and user-friendly.

Syntax:

<p-treeTable 
    [value]="tableData" 
    [columns]="cols" 
    [scrollable]="true" 
    scrollHeight="200px" 
    [reorderableColumns]="true">
    
    <ng-template pTemplate="colgroup" let-columns>
        ...
    </ng-template>
    <ng-template pTemplate="header" let-columns>
        ...
    </ng-template>
    <ng-template pTemplate="body">
        ...
    </ng-template>
</p-treeTable>

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 that demonstrates the use of the Angular PrimeNG TreeTable Column Reordering.

app.component.html

<div style="height: calc(100vh - 149px)">
    <h2 style="color: green">GeeksforGeeks</h2>
    <h4>Angular PrimeNG TreeTable Column Reordering</h4>

    <p-treeTable
        [columns]="cols"
        [value]="tableData"
        [reorderableColumns]="true">
        <ng-template pTemplate="colgroup" let-columns>
            <colgroup>
                <col *ngFor="let col of columns" />
            </colgroup>
        </ng-template>

        <ng-template pTemplate="header" let-columns>
            <tr>
                <th
                    *ngFor="let col of columns"
                    ttReorderableColumn>
                    {{ col.header }}
                </th>
            </tr>
        </ng-template>

        <ng-template
            pTemplate="body"
            let-rowNode
            let-rowData="rowData"
            let-columns="columns">
            <tr>
                <td *ngFor="let col of columns; let i = index">
                    <p-treeTableToggler
                        [rowNode]="rowNode" *ngIf="i == 0">
                    </p-treeTableToggler>
                    {{ rowData[col.field] }}
                </td>
            </tr>
        </ng-template>
    </p-treeTable>
</div>

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 {
    tableData: TreeNode[] = [];
    cols: any[] = [];
    constructor(private nodeService: NodeService) { }

    ngOnInit() {
        this.cols = [
            { field: 'firstname', header: 'First Name' },
            { field: 'lastname', header: 'Last Name' },

            { field: 'age', header: 'Age' },
        ];
        this.tableData = [
            {
                data: {
                    firstname: 'David',
                    lastname: 'ace',
                    age: '40',
                },
                children: [
                    {
                        data: {
                            firstname: 'Nathan',
                            lastname: 'ace',

                            age: '16',
                        },
                        children: [
                            {
                                data: {
                                    firstname: 'Abe',
                                    lastname: 'ace',

                                    age: '12',
                                },
                            },
                            {
                                data: {
                                    firstname: 'Ksi',
                                    lastname: 'ace',

                                    age: '12',
                                },
                            },
                        ],
                    },
                    {
                        data: {
                            firstname: 'Shane',
                            lastname: 'ace',

                            age: '14',
                        },
                    },
                ],
            },
            {
                data: {
                    firstname: 'Warner',
                    lastname: 'ace',

                    age: '55',
                },
                children: [
                    {
                        data: {
                            lastname: 'ace',
                            firstname: 'Michelle',
                            age: '20',
                        },
                    },
                    {
                        data: {
                            firstname: 'Charlie',
                            lastname: 'ace',

                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    firstname: 'Max',
                    lastname: 'ace',

                    age: '55',
                },
                children: [
                    {
                        data: {
                            firstname: 'Michelle',
                            lastname: 'ace',

                            age: '20',
                        },
                    },
                    {
                        data: {
                            firstname: 'Charlie',
                            lastname: 'ace',

                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    firstname: 'Willy',
                    lastname: 'ace',

                    age: '55',
                },
                children: [
                    {
                        data: {
                            firstname: 'Michelle',
                            lastname: 'ace',

                            age: '20',
                        },
                    },
                    {
                        data: {
                            firstname: 'Charlie',
                            lastname: 'ace',

                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    firstname: 'Miley',
                    lastname: 'ace',

                    age: '55',
                },
                children: [
                    {
                        data: {
                            firstname: 'Michelle',
                            lastname: 'ace',

                            age: '20',
                        },
                    },
                    {
                        data: {
                            firstname: 'Charlie',
                            lastname: 'ace',

                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    firstname: 'Sam',
                    lastname: 'ace',

                    age: '55',
                },
                children: [
                    {
                        data: {
                            firstname: 'Michelle',
                            lastname: 'ace',

                            age: '20',
                        },
                    },
                    {
                        data: {
                            firstname: 'Charlie',
                            lastname: 'ace',

                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    firstname: 'James',
                    lastname: 'ace',

                    age: '55',
                },
                children: [
                    {
                        data: {
                            firstname: 'Michelle',
                            lastname: 'ace',

                            age: '20',
                        },
                    },
                    {
                        data: {
                            lastname: 'ace',
                            firstname: 'Charlie',

                            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';

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

export class AppModule { }

Output:

Example 2: Below is another example demonstrating the use of the Angular PrimeNG TreeTable Column Reordering.

app.component.html

<h2 style="color: green">GeeksforGeeks</h2>
<h4>Angular PrimeNG TreeTable Column Reordering</h4>

<p-treeTable
    [value]="tableData"
    [columns]="cols"
    [scrollable]="true"
    scrollHeight="200px"
    [reorderableColumns]="true">
    <ng-template pTemplate="colgroup" let-columns>
        <colgroup>
            <col *ngFor="let col of columns" />
        </colgroup>
    </ng-template>
    <ng-template pTemplate="header" let-columns>
        <tr>
            <th
                *ngFor="let col of columns"
                ttReorderableColumn>
                {{ col.header }}
            </th>
        </tr>
    </ng-template>
    <ng-template
        pTemplate="body"
        let-rowNode
        let-rowData="rowData"
        let-columns="columns">
        <tr>
            <td *ngFor="let col of columns; let i = index">
                <p-treeTableToggler
                    [rowNode]="rowNode"
                    *ngIf="i == 0">
                </p-treeTableToggler>
                {{ rowData[col.field] }}
            </td>
        </tr>
    </ng-template>
</p-treeTable>

app.component.ts

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

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
})
export class AppComponent {
    tableData: TreeNode[] = [];
    cols: any[] = [];
    constructor(private nodeService: NodeService) { }

    ngOnInit() {
        this.cols = [
            { field: 'name', header: 'Name', width: '50%' },
            { field: 'age', header: 'Age', width: '30%' },
        ];
        this.tableData = [
            {
                data: {
                    name: 'David',
                    age: '40',
                },
                children: [
                    {
                        data: {
                            name: 'Nathan',
                            age: '16',
                        },
                    },
                    {
                        data: {
                            name: 'Shane',
                            age: '14',
                        },
                    },
                ],
            },
            {
                data: {
                    name: 'Warner',
                    age: '55',
                },
                children: [
                    {
                        data: {
                            name: 'Michelle',
                            age: '20',
                        },
                    },
                    {
                        data: {
                            name: 'Charlie',
                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    name: 'Max',
                    age: '55',
                },
                children: [
                    {
                        data: {
                            name: 'Michelle',
                            age: '20',
                        },
                    },
                    {
                        data: {
                            name: 'Charlie',
                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    name: 'Willy',
                    age: '55',
                },
                children: [
                    {
                        data: {
                            name: 'Michelle',
                            age: '20',
                        },
                    },
                    {
                        data: {
                            name: 'Charlie',
                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    name: 'Miley',
                    age: '55',
                },
                children: [
                    {
                        data: {
                            name: 'Michelle',
                            age: '20',
                        },
                    },
                    {
                        data: {
                            name: 'Charlie',
                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    name: 'Sam',
                    age: '55',
                },
                children: [
                    {
                        data: {
                            name: 'Michelle',
                            age: '20',
                        },
                    },
                    {
                        data: {
                            name: 'Charlie',
                            age: '24',
                        },
                    },
                ],
            },
            {
                data: {
                    name: 'James',
                    age: '55',
                },
                children: [
                    {
                        data: {
                            name: 'Michelle',
                            age: '20',
                        },
                    },
                    {
                        data: {
                            name: 'Charlie',
                            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';

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

export class AppModule { }

Output:

Reference: https://primefaces.org/primeng/treetable/reorder