Angular PrimeNG TreeTable Loading Status

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. In this article, we will see how to use TreeTable Column Resize in Angular PrimeNG.

Angular PrimeNG TreeTable Loading Status enables a loader in the TreeTable component. A loader makes the TreeTable component interactive and is a good way to represent till the data loads. 

Syntax:

<p-treeTable
 [loading]='loading'>
</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 Loading Status, In this example, we have delayed the data for 1 second and used the loader till the data.

app.component.html

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

    <p-treeTable [columns]="cols"
                 [value]="tableData"
                 [loading]="loading">
        <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[] = [];
  loading: boolean;

  constructor(private nodeService: NodeService) {}

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

      { field: "age", header: "Age" },
    ];
    this.loading = true;
    setTimeout(() => {
      this.loading = false;
      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",
              },
            },
          ],
        },
      ];
    }, 1000);
  }
}

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: In this example, we have applied infinite loading.

app.component.html

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

    <p-treeTable [columns]="cols"
                 [value]="tableData"
                 [loading]="loading">
        <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 { TreeNode } from "primeng/api";

@Component({
  selector: "app-root",
  templateUrl: "./app.component.html",
})
export class AppComponent {
  tableData: TreeNode[] = [];
  cols: any[] = [];
  loading: boolean;

  constructor() {}

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

      { field: "age", header: "Age" },
    ];
    this.loading = true;
  }
}

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