SCALA电梯 - 缺少参数类型扩展功能

Question

我有以下形式：

<form class="lift:form.ajax"> 

    <div class="lift:StreamInput"> 
     <input type="hidden" name="user" value="USER" /> 
     <input type="hidden" name="room" value="ROOM" /> 
     <input type="hidden" name="path" value="PATH" /> 
     <input type="hidden" name="level" value="LEVEL" /> 
    </div> 

    <input type="submit" value="" /> 

</form> 

其中进入：

object StreamInput { 

    case class StreamItem(

     user: String, 
     path: String, 
     level: String, 
     room: String 

    ) 

    def render = { 

     var user = "" 
     var path = "" 
     var level = "" 
     var room = "" 

     def process(): JsCmd = { 

      var message = StreamItem(user, path, level, room) 
      StreamServer ! message 

     } 

     "name=user" #> SHtml.onSubmit(user => user = _) 
     "name=path" #> SHtml.onSubmit(path => path = _) 
     "name=level" #> SHtml.onSubmit(level => level = _) 
     "name=room" #> (SHtml.onSubmit(room => room = _) ++ SHtml.hidden(process)) 

    } 

} 

编译时，我发现了以下错误：

"Missing parameter type for expanded function ((x$1) => user = x$1)" 
"name=user" #> SHtml.onSubmit(user => user = _) 
              ^
"Missing parameter type for expanded function ((x$2) => user = x$2)" 
"name=path" #> SHtml.onSubmit(path => path = _) 
              ^
"Missing parameter type for expanded function ((x$3) => user = x$3)" 
"name=level" #> SHtml.onSubmit(level => level = _) 
               ^
"Missing parameter type for expanded function ((x$4) => user = x$4)" 
"name=room" #> SHtml.onSubmit(room => room = _) 
              ^

我一直在谷歌搜索了一段时间，似乎无法找到适合我的特定情况的解释。

不知道我错过了什么，任何的帮助深表感谢，感谢提前:)

Answer 1

SHtml.onSubmit采用了回调(String) ⇒ Any。 String是该字段的新提交值。在你的情况下，你想提供一个setter方法，将你的var改为新的值。参数更改为

SHtml.onSubmit(user = _) 

或扩大

SHtml.onSubmit(text => user = text) 

（Documentation）