How to add ngbDropdown to bootstrap 4 navbar

Question

I am using ng-bootstrap Angular 2.

    <nav class="navbar navbar-fixed-top navbar-dark bg-inverse"> 
        <ul class="nav navbar-nav">  
           <li class="nav-item">
                <a class="nav-link" href="#">About</a>
           </li>
            <li class="nav-item">
                <div ngbDropdown>
                  <button class="btn" ngbDropdownToggle>Projects</button>
                  <div class="dropdown-menu">
                    <button class="dropdown-item"  >AA</button>
                  </div>
                </div>
            </li>
        </ul>
     </nav>

Dropdown menu issues cannot be expanded

Answer 1

It's hard to understand what is going on in your particular project, since I just copied and pasted your code and it works fine, check out this plunker: http://plnkr.co/edit/CFntB5mkshJ97x1aIGU1?p=preview

You might want to check if you are importing ( import {NgbModule} from '@ng-bootstrap/ng-bootstrap') the module correctly NgbModule:

@NgModule({ imports: [ BrowserModule, NgbModule ], declarations: [ App ], bootstrap: [ App ] }) export class AppModule {}

Answer 2

If you want your navigator to switch, check this:

<nav class="navbar navbar-dark bg-inverse">
<button class="navbar-toggler hidden-sm-up" type="button" data-toggle="collapse" data-target="#navExample" aria-controls="navExample" aria-expanded="false" aria-label="Toggle navigation">
    &#9776;
</button>
<div class="collapse navbar-toggleable-xs" id="navExample">
    <ul class="nav navbar-nav">
        <li class="nav-item">
            <a href="#" class="nav-item nav-link">First link</a>
        </li>
        <li class="nav-item">
            <a href="#" class="nav-item nav-link">Second link</a>
        </li>
    </ul>
</div>

, ;

<div ngbDropdown class="d-inline-block">
    <button class="btn btn-outline-primary" id="dropdownMenu1" ngbDropdownToggle>Toggle dropdown</button>
    <div class="dropdown-menu" aria-labelledby="dropdownMenu1">
        <button class="dropdown-item">Action - 1</button>
        <button class="dropdown-item">Another Action</button>
        <button class="dropdown-item">Something else is here</button>
    </div>
</div>

, html bootstrap ( bootstrap 4).