The page is unable to find the 'backdrop' property because it is undefined

I'm currently using this code in my HTML page. In my angular module, I have imported all the necessary components. However, I keep encountering an error related to the backdrop. Can someone please assist me with this issue? I am unfamiliar with backdrops and would appreciate an explanation of why this error occurs.

<div class="animated fadeIn">
      <div class="row">
        <div class="col-lg-12">
          <div class="card">
            <div class="card-header">
              <i class="fa fa-align-justify"></i> Bootstrap Modals
            </div>
            <div class="card-block">
              <!-- Button trigger modal -->
              <button type="button" class="btn btn-secondary" data-toggle="modal" (click)="smallModal.show()">
        Launch small modal
      </button>
            </div>
          </div>
        </div>
        <!--/.col-->
      </div>
      <!--/.row-->
    </div>

    <div bsModal #smallModal="bs-modal" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
      <div class="modal-dialog modal-sm" role="document">
        <div class="modal-content">
          <div class="modal-header">
            <h4 class="modal-title">Modal title</h4>
            <button type="button" class="close" (click)="smallModal.hide()" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
          </div>
          <div class="modal-body">
            <p>One fine body&hellip;</p>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-secondary" (click)="smallModal.hide()">Close</button>
            <button type="button" class="btn btn-primary">Save changes</button>
          </div>
        </div>
        <!-- /.modal-content -->
      </div>
      <!-- /.modal-dialog -->
    </div>
    <!-- /.modal -->

Below is my .ts file

import { Component, OnInit, ViewChild } from '@angular/core';
import { ModalDirective } from 'ng2-bootstrap/modal/modal.component';

@Component({
  selector: 'app-mso-user-profile',
  templateUrl: './mso-user-profile.component.html',
  styleUrls: ['./mso-user-profile.component.css']
})
export class MsoUserProfileComponent implements OnInit {

  constructor() { }

  ngOnInit() {
  }

}

Answer №1

Modal activation ID and modal ID missing.

Current code 1

<button type="button" class="btn btn-secondary" data-toggle="modal" (click)="smallModal.show()">

Suggested code 1

<!-- Trigger Button for Modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" **data-target="#YourModalName"**>Launch demo modal</button>

Current code 2

<div bsModal #smallModal="bs-modal" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">

Suggested code 2

<div class="modal fade" **id="YourModalName"** tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">

Answer №2

If you're attempting to dynamically load a component using a factory, the process should look something like this:

const factory = this.resolver.resolveComponentFactory(YOURModalComponent);
const componentRef = this.fileAttacherContainer.createComponent(factory);
const component = componentRef.instance;

It's important to wait until the component creation is complete before proceeding, as the initialization of ngx-bootstrap backdrop won't be triggered until then. For example, if you try to show the modal immediately after creating it, you may encounter issues:

setTimeout(() => {
    component.show();
}, 2000); //adjust milliseconds as needed

However, keep in mind that this workaround is not ideal but provided for understanding purposes.

A more reliable solution would involve utilizing Promises or calling component.show(); within the ngAfterViewInit lifecycle hook of your child component.

For further information, consider reading the following article: https://angular.io/api/core/AfterViewChecked

Answer №3

For me, the Offcanvas was a child component and wasn't in the DOM when the button was clicked due to a specific condition. When I adjusted this condition, everything started functioning properly.

Below is an example using Bootstrap 5 and Angular 15:

// Component containing the button to open the Offcanvas

<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#YourModalName">

...

<child-component *ngIf="data$ | async as data" [data]="data"/>

// Child component with the Offcanvas HTML

<div class="modal fade" id="YourModalName" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">

Answer №4

Include the following class:

// HIGHLY RECOMMENDED
import { ModalModule } from 'ngx-bootstrap/modal';
// alternatively 
import { ModalModule } from 'ngx-bootstrap';

@NgModule({
  imports: [ModalModule.forRoot(),...]
})
export class AppModule(){}

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