Twitter Bootstrap 3输入和图标不显示内联

我的问题是我无法在输入之前显示我的glyphicon.

这是我的代码:

      
 




  


    ×    
    
Log in
  
{{--close modal header --}}



  


    {{ Form::open(array('url'=>'/' ,'role'=>'form')) }}


   @if($errors->count()>0)
      


        
Errors

        

          @foreach($errors->all() as $error)
            

              {{$error}}
            
          @endforeach
        
      
    @endif


    @if(Session::has('flash_message'))
      

      
{{Session::get('flash_message')}}

      
    @endif


    


         
        {{ Form::text('username', null, ['required'=>'1','placeholder'=>'Username','id'=>'user','class'=>'form-control']) }}
        

      


      


         

          {{ Form::password('password',      ['required'=>'1','placeholder'=>'Password','id'=>'password','class'=>'form-control']) }}
        
      

           


       {{'                      
       '}}


       {{ Form::submit('login',['class'=>'btn']) }} 

       or

       {{ Form::button('Sign up',['class'=>'btn btn-danger','data-dismiss'=>'modal','data-toggle'=>'modal','data-target'=>'#signup']) 
        }}



      {{ Form::close() }}



  
{{--close modal body --}}





  

    Close

  



  



 {{--close modal --}}

其中的行如{{Form :: text('username',null,['required'=>'1','placeholder'=>'Username','id'=>'user','class'=> 'form-control'])}}是Laravel 4命令,它们生成输入类型="text"name ="text"class ="form-control pleceholder = ...

请回答只有bootstrap 3 ..