Setting implicit language in i18n Play 2.4 Scala template

debugcn Published at Dev

Blackbird

Hello Stackoverflow community!

I have i18n working in my Play 2.4 application, so that's a good start.

What I want to do now is to override the implicit Lang sent to a template. For example, if the IP address is located in Sweden, I want to set the implicit Lang to Swedish regardless of what preferred language is set in the browser. How to do this?

This is my code:

My Application.scala controller:

package controllers

import javax.inject.Inject

import play.api.i18n.{I18nSupport, Lang, MessagesApi}
import play.api.mvc._

class Application @Inject() (val messagesApi: MessagesApi) extends Controller with I18nSupport {
  def index = Action { implicit request =>
    if (isIpAddressLocatedInSweden) {
      implicit val langFromIp = Lang.apply("sv")
      Logger.info("Language set to Swedish")
    }

    Ok(views.html.index())
  }

  private def isIpAddressLocatedInSweden: Boolean = {
    [...]
  }
}

My index.scala.html view:

@()(implicit messages: Messages, lang: Lang)

@main("Page Title") {
<span>@lang.toString()</span>
<h1>@Messages("home.title")</h1>
}

Unfortunately, the result is:

The <span> element contains the preferred browser language: "Lang(en,)"
The <h1> element contains the value I've written in messages.en

Thanks for any help!

Blackbird

This is the cleanest way I got it to work:

Code of my Application.scala controller:

class Application @Inject()(val messagesApi: MessagesApi) extends Controller with I18nSupport {
  def index = Action { implicit request =>
    val lang = if (isIpAddressLocatedInSweden) {
      Lang.apply("sv")
    } else {
      Lang.preferred(request.acceptLanguages)
    }

    Ok(views.html.index()).withLang(lang)
  }

  private def isIpAddressLocatedInSweden: Boolean = {
    [...]
  }
}

The code of the index.scala.html view is unchanged.

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