如何在 <select> 标签中的 laravel blade 中声明子类别及其 init 子类别

Question

我可以获得我的类别及其无限子类别但我不知道如何在这种状态下的选择选项标签中显示它们：（我只想在 blade 中显示属于其 parent 的子类别（及其无限子类别）

类别

cloth
 -Men
  --Tshirt

 -Women 
  --Tshirt

这是我的类别模型方法代码

public function subcategories()
    {
        return $this->hasMany(Category::class, 'parent_id');
    }

这是我的迁移

$table->id();
            $table->string('title');
            $table->string('slug');

            $table->foreignId('parent_id')
                  ->nullable()
                  ->constrained('categories')
                  ->cascadeOnDelete()
                  ->cascadeOnUpdate();

这是我的index.blade.php视图

<select
class="form-select @error('parent') is-ivalid @enderror"
required="">
<option selected="" value="0">None</option>
@foreach($categories as $category)
    @if($category->{'parent_id'} === null)
        <option
            value="{{$category->{'id'} }}">
            {{$category->{'title'} }}
        </option>
            @if(count($category->subcategories ))
                @include('admin.layouts.partials.subcategory' , ['sub'=>$category->subcategories])
            @endif

    @endif
@endforeach
</select>

这是我的 partials 子类别 blade

@foreach($sub as $child)
    <option value="{{$child->{'id'} }}">
        {{$child->{'title'} }}
    </option>

    @if(count($child->subcategories))
        @include('admin.layouts.partials.subcategory' , ['sub'=>$child->subcategories])
    @endif
@endforeach

Answer 1

假设你的关系是正确的。尝试将 blade 部分更改为：

@foreach ($categories as $category)
    <optgroup label={{ $category->title }}>
        @if(isset($category->subcategories))
            @foreach ($category->subcategories as $subcategories)
                <option value={{ $subcategory->id }}>
                    {{ $subcategory->title }}
                </option>
            @endforeach
        @else
            <option value="undefined">No available subcategories</option>
        @endif
    </optgroup>
@endforeach

有了这个，您可以将所有类别打印为一个选项组 (optgroup)，对于您打印的每个类别，您都可以将其子类别打印为该 optgroup 标签中的选项。如果类别没有子类别，它将显示 No available subcategories

如何在 <select> 标签中的 laravel blade 中声明子类别及其 init 子类别

how to declare subcategory and its inifit subcategory in laravel blade in the <select> tag

laravel

laravel-blade