Laravel获得多个选择的下拉值到控制器

Question

我有一个具有多选择下拉列表的表单

<form role="form" method="post" action="{{route('dev-admin.developer-contractor-associations.add.post')}}" autocomplete="off">
        <div class="col-12">
            @csrf
            <div class="form-group {{ $errors->has('defect-type-id') ? ' has-danger' : '' }}">
                <select class="selectpicker {{ $errors->has('defect-type-id') ? 'is-invalid' : '' }}" name="defect-type-id" id="defect-type-id" multiple data-style="selectpicker-style" data-width="100%" title="Defect Types">
                    @foreach(App\DefectType::select('id','title')->get() as $defect_type)
                        <option value="{{$defect_type->id}}">{{$defect_type->title}}</option>
                    @endforeach
                </select>
                @if ($errors->has('defect-type-id'))
                <span class="invalid-feedback" role="alert">
                    <strong>{{ $errors->first('defect-type-id') }}</strong>
                </span>
                @endif
            </div>
        </div>
        <div class="col-12">
        <div class="text-center">
            <button onclick="return confirm('Are you sure to associate this contractor?')" type="submit" class="btn btn-primary my-4">Associate</button>
        </div>
    </div>
</form>

当我想获得控制器中的值时，我只接收一个选定的值，而不是一个所选选项的列表：

public function postAddDeveloperContractorAssociation(Request $request ) {

    $defect_type_id = $request->input('defect-type-id');
    dd($defect_type_id);
    return redirect()->route('dev-admin.developer-contractor-associations.index')->withStatus(__('Contractor has been added.'));

}

当我dd的时候，我得到的只是像"2"，而不是[1, 2, 3]之类的东西

Answer 1

您必须在select输入名称之后添加一个空括号。

<select class="selectpicker {{ $errors->has('defect-type-id') ? 'is-invalid' : '' }}" name="defect-type-id[]" id="defect-type-id" multiple data-style="selectpicker-style" data-width="100%" title="Defect Types">
    @foreach(App\DefectType::select('id','title')->get() as $defect_type)
        <option value="{{$defect_type->id}}">{{$defect_type->title}}</option>
    @endforeach
</select>

注意name="defect-type-id[]"而不是name="defect-type-id"