在playframework scala模板中声明和传递List [英] declaring and passing List in playframework scala templates

问题描述

我有一个header.scala.html文件，该文件需要一个字符串和一个列表参数

I have a header.scala.html file that expects a string and a list parameter

即@(title: String)(scripts: List[String])

其他scala文件将引用标头，并将传递特定列表，例如

The other scala files will reference the header and will pass specific lists eg

@import scala._
@{val jsList = List("a", "b")}
@views.html.header("title"){jsList}

但是，我遇到Compliation错误-类型不匹配；找到:play.api.templates.Html必需:java.util.List [String]

However I get Compliation error - type mismatch; found : play.api.templates.Html required: java.util.List[String]

肯定有一些语法问题，我看不到...有人吗?

There must be some syntax issue that I'm not seeing... Anyone?

谢谢.

推荐答案

您不能在Play模板中声明变量(类似变量). (这是有关此问题的google小组讨论)

You cannot declare variables (like that) in Play templates. (here's a google groups discussion about it)

您可以做的第一件事是，如果您只需要在模板中使用一次该值:

The first thing you can do is, if you only need the value once in your template:

@views.html.header("title")(List("a","b"))

请注意，您应该使用(和)，我相信{}之间的所有内容都被解释为HTML代码(因此，您的类型不匹配错误).

Note that you should use ( and ), I believe that everything between {} is interpreted as HTML code (hence your type mismatch error).

但是，如果您在模板中需要多次，则此方法不合适.然后，您可以使用defining块:

However, this isn't a suitable approach if you need it multiple times in your templates. You can then use defining block:

@defining(List("a","b")) { jsList =>

  @* using it once *@
  @views.html.header("title")(jsList)

  @* using it twice *@
  <p>My list contains @jsList.size elements.</p>

  @* ... *@
}

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