Question

使用laravel 5.6，在我的应用程序中，我具有动态依赖的下拉选择框。这是我的控制器，

public function show($id)
    {
        $categories = Category::find($id);
        $catagory_list = DB::table('models')

                     ->groupBy('catagory_id')
                     ->get();
        $model_list = DB::table('brand')

                     ->groupBy('c_id')
                     ->get();
return view('cars.carform')->withCategories($categories)->withCatagory_list($catagory_list)->withModel_list($model_list);
    }

 function fetch1(Request $request)
    {
        $select = $request->get('select');
        $value = $request->get('value');
        $dependent = $request->get('dependent');
        $data = DB::table('brand')
               ->where($select,$value)
               ->groupBy($dependent)
               ->get();

               $output = '<option value="">Select '.ucfirst($dependent).'</option>';
               foreach ($data as $row) {
                $output .= '<option value="' .$row->$dependent. '">
                          '.$row->$dependent.'</option>';
               }
               echo $output;
    }

我的刀片文件是

<div class="form-group">
            <label for="exampleFormControlSelect1">Vehicle Category</label>
        <select name="c_id" id="c_id" class="form-control input dynamic" data-dependent="b_id" >

            @foreach($model_list as $model) 
            <option value="{{$categories->id}}">{{$categories->id}}</option>
            @endforeach


        </select>

        </div>

         <div class="form-group">
            <label for="exampleFormControlSelect1">Brand</label>

           <select name="b_id" id="b_id" class="form-control input dynamic" data-dependent="na" >
            <option value="">Select District</option>

        </select>
        </div>

        <div class="form-group">
            <label for="exampleFormControlSelect1">Model</label>
        <select name="na" id="na" class="form-control input">
            <option value="">Select Town</option>

        </select>
        </div>

jquery用于刀片文件，

<script>
    $(document).ready(function(){
        $('.dynamic').change(function(){
        if($(this).val() != '')
        {
            var select = $(this).attr("id");
            var value = $(this).val();
            var dependent = $(this).data('dependent');
            var _token = $('input[name="_token"]').val();
            $.ajax({
                url:"{{ route('cars.carform.fetch1')}}",
                method:"POST",
                data:{select:select, value:value, _token:

                    _token, dependent:dependent},
                    success:function(result)
                    {
                        $('#'+dependent).html(result);
                    }
            })
        }
        });
</script>

但是我可以在输入框中看到值。（$ categories-> id），但由于其他依赖选择框不起作用。当我再次手动选择值时，它正在工作。我需要自动选择$ categories-> id值，并动态依赖于其他选择框。

为什么在Laravel中无法动态依赖于下拉菜单

0 个答案: