Laravel

Question

我有一个布局，我在其中为所有 so-called "Sections" 使用每个循环。但是，每次我创建一个新的 blade 文件并扩展该特定布局时，它都会不断说该变量未定义。这是正确的，因为变量永远不会传递给布局文件。只有当我将变量传递给扩展布局的新 blade 文件时，它才有效。我如何在布局文件中使用该特定变量？

布局文件


<!doctype html>
<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- CSRF Token -->
    <meta name="csrf-token" content="{{ csrf_token() }}">

    <title>{{ config('app.name', 'Laravel') }}</title>

    <!-- Scripts -->
    <script src="{{ asset('js/app.js') }}" defer></script>


    <!-- Fonts -->
    <link rel="dns-prefetch" href="//fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet">

    <!-- Styles -->
    <link href="{{ asset('css/app.css') }}" rel="stylesheet">
    <link href="{{ asset('css/styles.css') }}" rel="stylesheet">
</head>
<body>
<div id="app">
    <div class="sidebar p-4 shadow-lg">
        <ul class="list-unstyled">
            <li class="sidebar-item"><a href="{{ route('sections') }}">Sections</a></li>
            @foreach($sections as $section)
                <li class="sidebar-item"><a href="">{{ $section->name }}</a></li>
            @endforeach
            <li class="sidebar-item"><a href="/">Go back home</a></li>
        </ul>
    </div>
    <div class="custom-container">
        @yield('content')
    </div>
</div>

<script type="text/javascript" src="{{ asset('js/jquery-3.4.1.min.js') }}"></script>
<script type="text/javascript" src="{{ asset('js/jquery-ui.min.js') }}"></script>
<script type="text/javascript" src="{{ asset('js/main.js') }}"></script>


</body>
</html>

服务提供商

<?php

namespace App\Providers;

use App\Section;
use Illuminate\Support\Facades\View;
use Illuminate\Support\ServiceProvider;

class ViewServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {

        // Using Closure based composers...
        view()->composer('layout.backend', function ($view) {
            $view->with('sections', Section::all());
        });
    }
}

Answer 1

您可以使用 View Composer 在呈现布局时将专门需要的数据传递给布局。您可以在服务提供商的 boot 方法中定义它：

use Illuminate\Support\Facades\View;

public function boot()
{
    View::composer('layout.yourlayout', function ($view) {
        $view->with('sections', ...);
    });
}

Laravel 6.x Docs - Views - View Composers composer

Laravel - 将变量传递给布局

Laravel - Pass variable to layout

php

laravel-6