bootstrap 4 in Angular 2 dropdown not working

Question

I have followed the following to install bootstrap 4 into my Angular 2 project: Accepted Answer, following the first 1,2,3 and 4 steps

However when I add the following <

Answer 1

1. Please install ng-bootstrap from this link Getting Started with the following command:

   npm `install --save @ng-bootstrap/ng-bootstrap`
   

2. Import it on app.module.ts like

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

3. Import on

   imports:[
      NgbModule.forRoot(),
   ]
   

4. Add ngbDropdown on dropdown

5. Add ngbDropdownToggle on dropdown Toggle DOM

6. Add ngbDropdownMenu on dropdown menu DOM

               
   
                   
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