Question

我使用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>

问题＆＃34;下拉菜单＆＃34;无法扩展

Answer 1

我很难看到你的特定项目中发生的事情，因为我刚刚复制了这个项目。粘贴你的代码，它工作得非常好，检查这个plunker：http://plnkr.co/edit/CFntB5mkshJ97x1aIGU1?p=preview

您可能想要验证是否正确导入（import {NgbModule} from '@ng-bootstrap/ng-bootstrap'）添加NgbModule模块：

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

Answer 2

如果您希望导航栏可以切换，请检查一下;

<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>

如果您只需要导航栏中的下拉菜单，官方网站中的示例应该有效;

<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>

确保你的html文件包含bootstrap（我使用bootstrap 4）。

如何将ngbDropdown添加到bootstrap 4导航栏

2 个答案: