Laravel 7.24如果用户登录，我如何更改导航栏的颜色

Question

我想要一个伪动态导航栏，当用户登录时，它会更改颜色。只要用户经过身份验证，无论用户在页面(主页、联系我们页面等(内的何处漫游，都应该发生这种颜色变化。有人能提出一些想法吗？

它不需要是多种颜色。就像用户登录之前一样，它是黑色的。用户登录后，它变为蓝色

<div class="container-fluid">
<nav class="navbar navbar-expand-md navbar-dark bg-dark">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<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="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About Us</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact">Contact Us</a>
</li>
</ul>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="login">Login</a>
</li>
<li class="nav-item">
<a class="nav-link"href="new_user">Signup</a>
</li>
</ul>
</div>
</nav>

Answer 1

如果您想再次轻松地自定义助手函数，那么您应该更好地使用它。为此：

1. 在app文件夹中创建helper.php文件

2. 像这个一样把你的代码放进去

   <?php
   function getNavigationColor()
   {
   if (auth()->check()){
   return 'bg-color-black';
   else{
   return 'bg-color-blue';
   }
   }
   

3. 编辑composer.json在autoload末尾添加行

   "autoload": {
   //... other params
   "files":[
   "app/helpers.php"
   ]
   },
   

4. 在命令行中运行composer du

现在您可以在项目中的任何位置访问getNavigationColor((。

然后像这样在任何你想要的地方使用它：

<div class="container-fluid">
<nav class="navbar navbar-expand-md navbar-dark bg-dark {{ getNavigationColor() }}">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<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="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About Us</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact">Contact Us</a>
</li>
</ul>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="login">Login</a>
</li>
<li class="nav-item">
<a class="nav-link"href="new_user">Signup</a>
</li>
</ul>
</div>
</nav>

Answer 2

您可以这样做：

@if (auth()->check()) {{-- or Auth::check() --}}
//show logged in stuff
@else
//show logged out stuff
@endif

你的代码看起来像

<nav class="navbar navbar-expand-md navbar-dark @if(auth()->check()) bg-blue @else bg-black @endif">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<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="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About Us</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact">Contact Us</a>
</li>
</ul>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="login">Login</a>
</li>
<li class="nav-item">
<a class="nav-link"href="new_user">Signup</a>
</li>
</ul>
</div>
</nav>

Answer 3

您可以使用laravel-blade指令来简化此任务。

对经过身份验证的用户使用@auth指令，对guest用户使用@guest指令。

<nav class="navbar navbar-expand-md navbar-dark @auth bg-blue @endauth @guest bg-black @endguest ">