原文地址:https://www.wjcms.net/archive...

写在后面的话

有限级分类,根本在所有的网站都有波及,所以是必须要把握的知识点,在网上看很多材料文档,要么不粗疏,要么基本不对,要么达不到料想的指标,其实实现的思路和办法非常简单,明天咱们一起来实现一下。

创立模型控制器数据迁徙文件

这里间接应用artisan命令进行创立
# -a 其实就是all,创立蕴含模型,控制器(资源),数据迁徙文件(工厂模型、seed)php artisan make:model -a Category

运行这条命令,就能够创立好资源控制器。

批改数据迁徙文件

首先批改数据迁徙文件xxx_create_categories_table.

关上文件,批改外面的up办法,增加相应字段。

Schema::create('categories', function (Blueprint $table) {            $table->id();            $table->string('title', 100)->comment('分类名称');            $table->string('name', 100)->comment('分类标识');            $table->string('description', 255)->nullable()->comment('分类形容');            $table->integer('pid')->default(0)->comment('分类id');            $table->integer('level')->default(1)->comment('分类层级');            $table->integer('sort')->default(0)->comment('排序');            $table->integer('status')->default(1)->comment('状态:0-禁用,1-失常');            $table->timestamps();        });

执行迁徙命令

php artisan migrate

嵌套模型实现读取

//App\Models\Category.phppublic function categories()    {        return $this->hasMany(self::class, 'pid', 'id')->with('categories');    }

控制器调用

//app\Http\controllers\CategooryController.php# use模型use App\Models\Category;public function index()    {        $categories = Category::with('categories')->where('pid', 0)->get();        return view('category.index', compact('categories'));    }

增加路由

在 routes/web.php,咱们增加以下内容:

Route::get('category', 'CategoryController@index');

blade模版渲染

这里应用递归渲染。

在 resources/views/categories.blade.php 文件:

<table class="table table-borderless table-data3">        <thead>            <tr>                <th>编号</th>                <th>分类名称</th>                <th>分类标识</th>                <th>分类形容</th>                <th>创立工夫</th>                <th>状态</th>                <th>操作</th>            </tr>        </thead>        <tbody>            @foreach ($categories as $category)            <tr class="tr-shadow">                <td>{{ $category->id }}</td>                <td>{{ $category->title }}</td>                <td>                    <span class="block-email">{{ $category->name }}</span>                </td>                <td class="desc">{{ $category->description }}</td>                <td>{{ $category->created_at }}</td>                <td>                    <span class="status--process">{{ $category->status }}</span>                </td>                <td></td>            </tr>            <tr class="spacer"></tr>            @foreach ($category->categories as $childCategory)            @include('category.child_category', ['child_category' => $childCategory])            @endforeach            @endforeach        </tbody>    </table>

递归局部加载本身模版child_category.blade.php

<tr class="tr-shadow">    <td>{{ $child_category->id }}</td>    <td>|{{ str_repeat('--',$child_category->level-1) }} {{ $child_category->title }}</td>    <td>        <span class="block-email">{{ $child_category->name }}</span>    </td>    <td class="desc">{{ $child_category->description }}</td>    <td>{{ $child_category->created_at }}</td>    <td>        <span class="status--process">{{ $child_category->status }}</span>    </td>    <td></td></tr><tr class="spacer"></tr>@if ($child_category->categories)@foreach ($child_category->categories as $childCategory)@include('category.child_category', ['child_category' => $childCategory])@endforeach@endif

最初看一下成果