Collapse not working in ng-bootstrap and angular 4 app for navbar breadcrumb button

Question

I am using angular 4 and bootstrap 4 beta 2 and ng-bootstrap for my application and also using ng-bootstrap.

I have added the navbar from the bootstrap documentation example.

The code looks like this:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarTogglerDemo02">
    <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

I have also added bootstrap styles in angular-cli.json. That code looks like this:

 "styles": [
        "../node_modules/bootstrap/dist/css/bootstrap.min.css",
        "styles.css"
      ],

The Breadcrumb button on the mobile view is not responding on its click. and when i tried to inspect the same: I got to know that "collapsed" class is not getting added to the button on click.

Answer 1

I have a solution now. Just using ng-bootstrap solves your issue.

Html file:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler btn btn-outline-primary" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo02"  aria-expanded="false" aria-label="Toggle navigation" (click)="isCollapsed = !isCollapsed" [attr.aria-expanded]="!isCollapsed" aria-controls="navbarTogglerDemo02">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarTogglerDemo02" [ngbCollapse]="isCollapsed">
    <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

Component ts file:

export class AppComponent {
  isCollapsed = false;
}

add bootstrap css file in angular-cli.json:

"styles": [
        "../node_modules/bootstrap/dist/css/bootstrap.min.css",
        "styles.css"
      ],

Add this in main module:

import {NgbModule} from '@ng-bootstrap/ng-bootstrap';

imports: [
  NgbModule.forRoot()
]

This will work like a charm.

The main advantage of using ng-bootstrap is you can eliminate the dependencies of other js libraries like jquery and popper and you can also write your components for bootstrap.