laravel undefine变量：类别

Question

请帮助我;我是Laravel的新手，我不明白我做错了什么。

这里是我的观点：

<div class="container"> 
    <h1>category and subcategory</h1> 
    <div class="row"> 
    <div class="col-md-10 col-md-offset-1"> 
     {!! Form::open(array('url' => '','files'=>true)) !!} {!! Form::token(); !!} 
     <div class="form-group"> 
     <label for="">category</label> 
     <select class="form-control input-sm" name="" id=""> 
      @foreach ($category as $category) 
      <option value="{{$category->id}}">{{$category->name}}</option> 
      @endforeach 
     </select> 
     </div> 
     <div class="form-group"> 
     <label for="">subcategory</label> 
     <select class="form-control input-sm" name="" id=""> 
      <option value=""></option> 
     </select> 
     </div> 
     </form> 
    </div> 
    </div> 
    <script type="text/javascript"> 
    $(document).ready(function() { 
      $("#category").on('change', function(e) { 
      console.log(e); 
      var cat_id = e.target.value; 
      $.get('/ajax-subcat/' + cat_id, function(data) { 
       //success data 
       console.log(data); 
      }) 
      }); 
    </script> 
</div> 
</div> 
</div> 

这里是我的路线：

Route::get('/', function() { 
    $category = \App\ category::all(); 
    return view('layouts.app') - > with('categories', $category); 
}); 
Route::get('/ajax-subcat', function() { 
    $category = \App\ category::all(); 
    $cat_id = Input::get('cat_id'); 
    $subcategory = subcategory::where('category_id', '=', $cat_id) - > orderBy('name', 'asc') - > get(); 
    return response() - > json($subcategory); 
}); 

这是我的错误日志文件：

ErrorException在ec195dc7ec967851481b4815c28c6879244d5d45。 phpline 87： 未定义变量：类别（查看：C：\ xampp \ htdocs \ laravel \ resources \ views \ layouts \ app.blade.php）（查看：C：\ xampp \ htdocs \ laravel \ resources \ views \ layouts \ app.blade .PHP） 在ec195dc7ec967851481b4815c28c6879244d5d45.php线87 在PhpEngine.php线44 CompilerEngine-> handleViewException（对象（ErrorException）， '1'）在PhpEngine-

什么导致这些错误？

Answer 1

尝试改变：

@foreach ($category as $category) 

到：

@foreach ($categories as $category) 

希望这有助于！