How to avoid adding duplicate dynamic components?

Question

I am trying to avoid adding duplicate dynamic component in the angular application. I do not know how to do it. If any one know help to resolve this issue.

home.component.html:

<p>And I'm Lucas Simões</p>

<button type="button" (click)="addComp()">Add component</button>

<div #myDiv></div>

home.component.ts

import { Component, inject, OnInit,ViewChild,ViewContainerRef } from '@angular/core';
import { DataComponent } from '../data/data.component';
@Component({
 selector: 'app-home',
 templateUrl: './home.component.html',
 styleUrls: ['./home.component.css'],
 standalone: true,
})
export class HomeComponent implements OnInit{
@ViewChild('myDiv', {static:false, read: ViewContainerRef}) ele!:any;
ngOnInit(){ 
}

 addComp(){
  this.ele.createComponent(DataComponent);
 }

}

stackblitz

Your question is not clear. What do you mean by avoid adding duplicate dynamic component? — Weber K.
– Weber K., Commented Jun 27 at 12:17
@WeberK.: Check the image or Stacklitz demo link. You can understand easily. Also Your concept iss not working: stackblitz.com/edit/… — Goutm
– Goutm, Commented Jun 27 at 12:57

Weber K. · Accepted Answer · 2025-06-27 15:04:24Z

1

If you want to avoid multiple DataComponent being created in the this.ele ElementRef, you can check before adding a new instance.

import {
  Component,
  OnInit,
  ViewChild,
  ViewContainerRef,
  ComponentRef
} from '@angular/core';
import { DataComponent } from '../data/data.component';
@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.css'],
  standalone: true,
})
export class HomeComponent {
  @ViewChild('myDiv', { static: false, read: ViewContainerRef }) ele!: any;
  private componentref?: ComponentRef<DataComponent>;

  addComp() {
    if (this.componentref == null) {
      this.componentref = this.ele.createComponent(DataComponent);
    }
  }
}

edited Jun 27 at 15:04

answered Jun 27 at 12:29

Weber K.

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3 Comments

Goutm Jun 27 at 12:56

Not working:stackblitz.com/edit/…

Weber K. Jun 27 at 14:57

A simple check was added

Goutm Jun 28 at 7:37

Any other way is there?

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