导航栏无法使用ng-bootstrap&在浏览器中呈现角度4 [英] navbar not rendering in browser using ng-bootstrap & angular 4
问题描述
我正在使用ng-bootstrap(用于Angular的Bootstrap 4)构建我的第一个Angular 4应用-不使用常规的Boostrap
I am building my first Angular 4 app, using ng-bootstrap (Bootstrap 4 for Angular) - not using regular Boostrap
ng-bootstrap网站( https://ng-bootstrap.github. io/#/components/accordion/api )没有列出导航栏的组件(就像在Bootstrap 3或常规Bootstrap 4中一样).这是否意味着我必须从下拉菜单/按钮中构建菜单?还是我必须将常规Bootstrap 4与ng-bootstrap混合使用?
The ng-bootstrap website (https://ng-bootstrap.github.io/#/components/accordion/api) does not list a component for a navbar (as it did in Bootstrap 3 or regular bootstrap 4). Does that mean I have to build a menu out of dropdowns/buttons? Or I have to mix regular Bootstrap 4 with ng-bootstrap?
我尝试在html中创建此菜单,但不会在浏览器中呈现(只是品牌"MyWebSiteName"和屏幕上的灰色小框,没有导航)
I tried creating this menu in the html but it won't render in the browser (just a brand "MyWebSiteName" and little grey box on my screen, no nav)
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">MyWebSiteName</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">Page 1 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Page 1-1</a></li>
<li><a href="#">Page 1-2</a></li>
<li><a href="#">Page 1-3</a></li>
</ul>
</li>
<li><a href="#">Page 2</a></li>
<li><a href="#">Page 3</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
<li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
</ul>
</div>
</div>
</nav>
此HTML出现问题了吗?还是有人提供了与ng-bootstrap一起使用的Navbar的示例?
I something wrong with this HTML ? Or does someone have an example of a Navbar that works with ng-bootstrap?
推荐答案
由于没有导航组件,因此您需要结合使用ng-bootstrap折叠功能的 NgbDropdown 组件.
As there is no navigation component you'd need to use a combination of the collapse functionality ng-bootstrap's ngbCollapse component as well as the dropdown functionality from the NgbDropdown component.
您需要将ngbCollapse
的实例绑定到div.collapse.navbar-collapse
,并在组件类上绑定一个布尔属性. ng-bootstrap对于data-*
没有任何用处,因此您可以删除诸如data-toggle="collapse"
之类的属性.
You'll need to bind an instance of ngbCollapse
to the div.collapse.navbar-collapse
and a boolean property on your component class. ng-bootstrap doesn't have any use for data-*
so you can remove attributes such as data-toggle="collapse"
.
您可以通过组件类上的属性来控制折叠菜单的打开/关闭状态,该属性可以通过单击事件之类的方法在true
/false
之间切换.在此示例中,通过button.navbag-toggler
上的(click)
事件处理程序进行切换,从而在组件toggleMenu()
上执行方法,该方法只是通过!
运算符将布尔属性isCollapsed
的值求反.
You control the open/close state of the collapse menu via a property on your component class that gets toggled true
/false
through something like a click event. In this example is toggle via a (click)
event handler on the button.navbag-toggler
executing a method on the component toggleMenu()
which simply inverts the value of boolean property isCollapsed
via the !
operator.
对于菜单项下拉菜单,您可以使用 NgbDropdown 组件.您将分别将ngbDropdown
和ngbDropdownToggle
属性应用于容器元素和切换元素.
For the menu item dropdown menu, you'd use the NgbDropdown component. You'd apply attributes ngbDropdown
and ngbDropdownToggle
to the container element and toggle element respectively.
<div class="nav-item dropdown" ngbDropdown>
<a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink" ngbDropdownToggle>
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="dropdownBasic1">
<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>
关于Bootstrap 4的样式 navbar ,则需要使用以下类:
In terms of styling for Bootstrap 4 navbar, you'll need to use the following classes:
导航栏需要带 .navbar-toggleable-* 的环绕式 .navbar 响应式折叠和配色方案类.
Navbars require a wrapping .navbar with .navbar-toggleable-* for responsive collapsing and color scheme classes.
在Bootstrap 4中,诸如button.navbar-toggle
之类的其他元素现在也已成为button.navbar-toggler
并带有"r".您将navbar-inverse
和bg-inverse
类用于标准逆导航栏.
Also elements such as button.navbar-toggle
are now button.navbar-toggler
with an "r" in Bootstrap 4. You use classes navbar-inverse
and bg-inverse
for the standard inverse navbar.
HTML:
<nav class="navbar navbar-toggleable-md navbar-inverse bg-inverse">
<button class="navbar-toggler navbar-toggler-right" type="button" aria-controls="appNavigation" [attr.aria-expanded]="!isCollapsed" aria-label="Toggle navigation" (click)="toggleMenu()">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="#">My App</a>
<div class="collapse navbar-collapse" id="appNavigation" [ngbCollapse]="isCollapsed">
<div class="navbar-nav mr-auto">
<a class="nav-item nav-link" routerLink="" routerLinkActive="active">Home</a>
<a class="nav-item nav-link" routerLink="/about" routerLinkActive="active">About</a>
<div class="nav-item dropdown" ngbDropdown>
<a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink" ngbDropdownToggle>
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="dropdownBasic1">
<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>
</div>
</div>
</nav>
TS:
export class NavigationComponent {
isCollapsed = true;
constructor() {}
toggleMenu() {
this.isCollapsed = !this.isCollapsed;
}
}
这是 plunker ,展示了功能和样式.
Here is a plunker demonstrating the functionality and styling in action.
这篇关于导航栏无法使用ng-bootstrap&在浏览器中呈现角度4的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!