Laravel-如何为编辑视图刀片创建分层下拉列表

我正在用Laravel-5.8开发一个Web应用程序

我已经完成了create.blade，如下所示：

public function create()
{
    $supervisors = Employee::all();
    return view('employees.create')->with('supervisors', $supervisor);
}

<select class="form-control select2bs4" data-placeholder="Choose Supervisor" tabindex="1" name="supervisor_id" style="width: 100%;">>
    <option value="">Select Supervisor</option>
     @if($supervisors->count() > 0)
        @foreach($supervisors as $supervisor)
           <option value="{{$supervisor->id}}">{{$supervisor->employee_code}}</option>
        @endforeach
     @endif
</select>

编辑刀片

<div class="col-12 col-sm-4">
   <div class="form-group">
     <label class="control-label"> Supervisor:</label>
      <select class="form-control select2bs4" data-placeholder="Choose Employee Type" tabindex="1" name="supervisor_id" style="width: 100%;">
       <option value="">Select Supervisor</option>
         @if($supervisors->count() > 0 )
          @foreach($supervisors as $supervisor)
            <option value="{{$supervisor->id}}" @if($supervisor->id == $employee->id) selected @endif>{{$supervisor->employee_code}}</option>
          @endforeach
         @endif
     </select>
   </div>
 </div>

监督人：
选择主管
@如果（$supervisors->count（）>0）
@foreach（$主管作为$主管）
id==$employee->id）选中@endif>{{{$supervisor->employee_code}
@endforeach
@恩迪夫

这给我的下拉值与加载的员工相同

如何像创建视图刀片一样为supervisor dropdownlist编写编辑视图刀片

---

谢谢。

您在控制器中的编辑功能

public function edit($id)
{
    $employee = Employee::findOrFail($id);
    $supervisors = Employee::all();
    return view('employees.edit')->with('supervisors', $supervisor);
}

以及编辑页面的代码

<select class="form-control select2bs4" data-placeholder="Choose Supervisor" tabindex="1" name="supervisor_id" style="width: 100%;">>
    <option value="">Select Supervisor</option>
     @if($supervisors->count() > 0)
        @foreach($supervisors as $supervisor)
           <option value="{{$supervisor->id}}" @if( $employee->supervisor_id == $supervisor->id )
                    selected
                @endif>{{$supervisor->employee_code}}</option>
        @endforeach
     @endif
</select>

>
选择主管
@如果（$supervisors->count（）>0）
@foreach（$主管作为$主管）
主管（id=$supervisor->id）
挑选出来的
@endif>{{$supervisor->employee_code}
@endforeach
@恩迪夫

同样的方法！出现了什么错误？显示的主管与当前加载员工相同。我已经用edit.blade更新了我的代码。将条件

@if（$supervisor->id==$employee->id）

更改为

@if（$supervisor->id==$employee->supervisor\u id）

<select class="form-control select2bs4" data-placeholder="Choose Supervisor" tabindex="1" name="supervisor_id" style="width: 100%;">>
    <option value="">Select Supervisor</option>
     @if($supervisors->count() > 0)
        @foreach($supervisors as $supervisor)
           <option value="{{$supervisor->id}}" @if( $employee->supervisor_id == $supervisor->id )
                    selected
                @endif>{{$supervisor->employee_code}}</option>
        @endforeach
     @endif
</select>