Angular PrimeNG TreeTable EmptyMessage

Last Updated : 28 Sep, 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. In this article, we will see how to use TreeTable Column Resize in Angular PrimeNG.

Angular PrimeNG TreeTable EmptyMessage acts as a placeholder to show whenever there is no data in the TreeTable component. EmptyMessage makes the TreeTable component more interactive and is a good way to show when there is no data.

Syntax:

<ng-template pTemplate="emptymessage" let-columns>
   <tr>
      <td [attr.colspan]="columns.length">
              No records found
      </td>
    </tr>
</ng-template>

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 EmptyMessage.

app.component.html

<div style="height: calc(100vh - 149px)"> 
    <h2 style="color: green">GeeksforGeeks</h2> 
    <h4>Angular PrimeNG TreeTable EmptyMessage</h4> 
  
    <p-treeTable [columns]="cols"  
                 [value]="tableData"> 
        <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="emptymessage" let-columns> 
            <tr> 
                <td [attr.colspan]="columns.length"> 
                    No records found 
                </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" }, 
    ]; 
  } 
}

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 delayed the data for 5 seconds. Till the data loads, we are showing EmptyMessage as a placeholder.

app.component.html

<div style="height: calc(100vh - 149px)"> 
    <h2 style="color: green">GeeksforGeeks</h2> 
    <h4>Angular PrimeNG TreeTable EmptyMessage</h4> 
  
    <p-treeTable [columns]="cols" [value]="tableData"> 
        <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> 
  
        <ng-template pTemplate="emptymessage" let-columns> 
            <tr> 
                <td [attr.colspan]="columns.length"> 
                    No records found 
                </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", 
              }, 
            }, 
          ], 
        }, 
      ]; 
    }, 3000); 
  } 
}

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 {}