scala - lift net.liftweb.http.S#param 不像维基说的那样工作

Question

我尝试复制 wiki http://wiki.liftweb.net/index.php/Hello_Darwin中的示例

在 HelloForm2.scala 的例子中

"submit" -> submit(?("Send"), () => {println("value:" + who + " :: " + param("whoField"))}),

它总是打印

value:Full(hogehoge) :: Empty" even if i set the who as "object who extends RequestVar(Full("world"))

我做错了吗？

很抱歉忘记发布完整代码，我已经尝试了 wiki 中的第二个，如下所示。索引.html

<lift:surround with="default" at="content">
<h2>Welcome to your project!</h2>
<lift:HelloWorld.show form="POST">
    Hello <hello:who />
    <br />
    <label for="whoField">Who :</label>
    <hello:whoField />
    <hello:submit />
</lift:HelloWorld.show>
</lift:surround>

和 HelloWorld.scala

class HelloWorld {
  object who extends RequestVar(Full("world"));
  def show(xhtml: NodeSeq): NodeSeq ={
    bind("hello", xhtml,
      "whoField" -> text(who.openOr(""), v => who(Full(v))) % ("size" -> "10") % ("id" -> "whoField"),
      "submit" -> submit(?("Send"), () => {println("value:" + who.openOr("") + " :: " + param("whoField"))}),
      "who" -> who.openOr("")
    )
  }
}

现在，谁在呈现的页面中显示正确，但控制台仍然打印 value:hogehoge :: Empty

我正在使用电梯 1.0

谢谢。

Answer 1

您还必须更改该代码，如 wiki 页面中的示例所示，我将在此处复制：

  bind("hello", xhtml, 
       "whoField" -> text(who.openOr(""), v => who(Full(v))) % ("size" -> "10") % ("id" -> "whoField"),
       "submit" -> submit(?("Send"), () => {println("value:" + who.openOr("") + " :: " + param("whoField"))}),
       "who" -> who.openOr("")
  )

请注意 whoField 的定义非常不同。