Bootstrap 升级 3 到 4 后，Angular NavBar 无法正常工作 [英] Working Angular NavBar not working after Bootstrap upgrade 3 to 4

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本文介绍了Bootstrap 升级 3 到 4 后，Angular NavBar 无法正常工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个使用 Bootstrap 3.3.7 在 Angular4 中开发的简单工作导航栏.当我尝试升级到 Bootstrap 4(4.0.0-beta 或 4.0.0-alpha.6)时，NavBar 不再显示在浏览器中(控制台中也没有显示错误).

HTML:

</nav>

打字稿:

import { Component, OnInit } from '@angular/core';@零件({选择器:'导航栏'，templateUrl: './navbar.component.html',styleUrls: ['./navbar.component.css']})导出类 NavbarComponent 实现 OnInit {构造函数(){}ngOnInit() {}}

非常感谢任何帮助，谢谢，马丁

解决方案

导航栏不显示的原因是 Bootstrap 4 几乎是 Bootstrap 3 的完全重写.换句话说，两个版本完全不兼容.

以下是 Bootstrap 4 中基本导航栏结构和组件的示例:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"><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="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle导航"><span class="navbar-toggler-icon"></span><div class="collapse navbar-collapse" id="navbarSupportedContent"><ul class="navbar-nav mr-auto"><li class="nav-item active"><a class="nav-link" href="#">首页 <span class="sr-only">(current)</span></a><li class="nav-item"><a class="nav-link" href="#">Link</a><li class="nav-item dropdown"><a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">落下</a><div class="下拉菜单" aria-labelledby="navbarDropdown"><a class="dropdown-item" href="#">Action</a><a class="dropdown-item" href="#">另一个动作</a><div class="dropdown-divider"></div><a class="dropdown-item" href="#">这里还有别的东西</a>

<li class="nav-item"><a class="nav-link disabled" href="#">Disabled</a><form class="form-inline my-2 my-lg-0"><input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search"><button class="btn btn-outline-success my-2 my-sm-0" type="submit">搜索</button></表单>

</nav><script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5Kkn"cross/脚本><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7xfakfakvskin匿名"></script><script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjPVCUar5"7xSfFWpi1MquVdAyjPVCUar5<6/script>

另请注意下面的各种 JavaScript 组件.这些对于使导航栏工作至关重要.确保加载它们.按照这个顺序.

对于您的特定导航栏，HTML 将是这样的:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"><nav class="navbar navbar-expand-lg navbar-light bg-light"><div class="容器"><a class="navbar-brand" href="#">NavbarBrand</a><button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle导航"><span class="navbar-toggler-icon"></span><div class="collapse navbar-collapse" id="navbarSupportedContent"><ul class="navbar-nav mr-auto"><li class="nav-item active" routerLinkActive="active current"><a class="nav-link" routerLink="/messages"><b>Messages</b></a><li class="nav-item" routerLinkActive="当前活动"><a class="nav-link" routerLink="/transformations"><b>Transformations</b></a><li class="nav-item" routerLinkActive="当前活动"><a class="nav-link" routerLink="/actions"><b>Actions</b></a><li class="nav-item" routerLinkActive="当前活动"><a class="nav-link" routerLink="/rules"><b>规则</b></a>

</nav><script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5Kkn"cross/脚本><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7xfakfakvskin匿名"></script><script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjPVCUar5"7xSfFWpi1MquVdAyjPVCUar5<6/script>

附言你应该避免使用 container-fluid 类作为导航栏，因为宽 4K 屏幕上的用户会生你的气.使用 container 代替(如我的最后一个片段所示).

I have a simple working NavBar developed in Angular4 with Bootstrap 3.3.7. When I try to upgrade to Bootstrap 4 (either 4.0.0-beta or 4.0.0-alpha.6) the NavBar is simply not displayed in the browser anymore (with no errors displayed in the console either).

HTML:

<nav class="navbar navbar-default">
  <div class="container-fluid">
    <div class="collapse navbar-collapse">
      <ul class="nav navbar-nav">
        <li routerLinkActive="active current"><a routerLink="/messages"><b>Messages</b></a></li>
        <li routerLinkActive="active current"><a routerLink="/transformations"><b>Transformations</b></a></li>
        <li routerLinkActive="active current"><a routerLink="/actions"><b>Actions</b></a></li>
        <li routerLinkActive="active current"><a routerLink="/rules"><b>Rules</b></a></li>
      </ul>
    </div>
  </div>
</nav>

Typescript:

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'navbar',
  templateUrl: './navbar.component.html',
  styleUrls: ['./navbar.component.css']
})
export class NavbarComponent implements OnInit {

  constructor() { }

  ngOnInit() {
  }

}

Any help greatly appreciated, thanks, Martin

解决方案

The reason why your navbar is not displaying is because Bootstrap 4 is almost a complete rewrite of Bootstrap 3. In other words, the two versions are completely incompatible.

Here's an example of a basic navbar structure and components in Bootstrap 4: 

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<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="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <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 dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </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" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>


<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

Also notice the various JavaScript components below. Those are essential to make the navbar work. Make sure you load them. In that order.

For your specific navbar the HTML would be this:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

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

       <div class="collapse navbar-collapse" id="navbarSupportedContent">
           <ul class="navbar-nav mr-auto">
               <li class="nav-item active" routerLinkActive="active current">
                   <a class="nav-link" routerLink="/messages"><b>Messages</b></a>
               </li>
               <li class="nav-item" routerLinkActive="active current">
                   <a class="nav-link" routerLink="/transformations"><b>Transformations</b></a>
               </li>
               <li class="nav-item" routerLinkActive="active current">
                   <a class="nav-link" routerLink="/actions"><b>Actions</b></a>
               </li>
               <li class="nav-item" routerLinkActive="active current">
                   <a class="nav-link" routerLink="/rules"><b>Rules</b></a>
               </li>
           </ul>
       </div>
   </div>
</nav>


<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

P.S. You should avoid using the container-fluid class for navbars because users on wide 4K screens will be mad at you. Use container instead (as shown in my last snippet).

这篇关于Bootstrap 升级 3 到 4 后，Angular NavBar 无法正常工作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！

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