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Answer to SO question http://stackoverflow.com/questions/18737876/add-script-to-the-head-from-scala-template-tags-in-play-framework-2/35429095#35429095
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| // controllers/Application.scala | |
| object Application extends Controller { | |
| def index = ActionWithAttrs { implicit request => | |
| Ok(views.html.index()) | |
| } | |
| } | |
| object ActionWithAttrs extends StackableAction |
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| @(implicit request: Request[_]) | |
| @main{ | |
| @indexHead @* content that goes in the head tag *@ | |
| } { | |
| @indexBody | |
| } |
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| @import views.support.JavascriptPage | |
| @(implicit request: Request[_]) | |
| @JavascriptPage.addNonBlockingJS("some-unique-id-for-this-script") { | |
| window.alert("mega kill"); | |
| } |
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| @import views.support.JavascriptPage | |
| @(implicit request: Request[_]) | |
| <script src="/javascripts/your_javascript_app.js"></script> | |
| <script id="non-blocking" type="text/javascript"> | |
| @defining(JavascriptPage.getNonBlockingJS()) { scripts => | |
| @scripts.map { case (_, item) => @item } | |
| } | |
| </script> |
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| package views.support | |
| import controllers.{RequestWithAttributes, AttributeKey} | |
| import play.api.mvc.{Request, RequestHeader} | |
| import play.twirl.api.Html | |
| // views/support/JavascriptPage.scala | |
| object JavascriptPage { | |
| case class NonBlockingJS(key: String) extends AttributeKey[Html] | |
| case class BlockingJS(key: String) extends AttributeKey[Html] | |
| def addNonBlockingJS(div: String)(jscript: Html)(implicit request: Request[_]): Unit = { | |
| request match { | |
| case i: RequestWithAttributes[_] => | |
| i.set(NonBlockingJS(div), jscript) | |
| case _ => | |
| } | |
| } | |
| // scripts that are supposed to go into the <head> tag, thus blocking scripts | |
| def addBlockingJS(div: String)(jscript: Html)(implicit request: Request[_]): Unit = { | |
| request match { | |
| case i: RequestWithAttributes[_] => | |
| i.set(BlockingJS(div), jscript) | |
| case _ => | |
| } | |
| } | |
| // scripts that are supposed to go before the </body> tag, non blocking scripts that is | |
| def getNonBlockingJS()(implicit request: Request[_]): Seq[(String, Html)] = { | |
| request match { | |
| case i: RequestWithAttributes[_] => | |
| i.getAll[NonBlockingJS].toSeq.map { | |
| case (NonBlockingJS(div), jscript: Html) => (div, jscript) | |
| } | |
| case _ => Seq.empty | |
| } | |
| } | |
| } |
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| @(head: Html)(body: Html)(implicit request: Request[_]) | |
| <html> | |
| <head> | |
| @head | |
| </head> | |
| <body> | |
| @body | |
| @inlineNonBlockingJS @* we append all of our javascript non blocking code (that were added to the Map up until this line) *@ | |
| </body> |
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| package controllers | |
| import play.api.mvc._ | |
| import scala.collection.concurrent.TrieMap | |
| import scala.concurrent.Future | |
| import scala.reflect.ClassTag | |
| // Borrowed from: https://github.com/rabitarochan/Play2-ChainAction/blob/master/core/src/main/scala/com/github/rabitarochan/play2/stackableaction/StackableAction.scala | |
| // controllers/StackableAction.scala | |
| abstract class StackableAction extends ActionBuilder[RequestWithAttributes] with StackableFilter { | |
| override def filter[A](request: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Future[Result]): Future[Result] = { | |
| f(request) | |
| } | |
| def invokeBlock[A](req: Request[A], block: RequestWithAttributes[A] => Future[Result]): Future[Result] = { | |
| val reqWA = new RequestWithAttributes(req, new TrieMap[AttributeKey[_], Any]()) | |
| filter(reqWA)(block) | |
| } | |
| } | |
| trait StackableFilter { | |
| def filter[A](request: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Future[Result]): Future[Result] | |
| } | |
| trait AttributeKey[A] { | |
| def ->(value: A): Attribute[A] = Attribute(this, value) | |
| } | |
| case class Attribute[A](key: AttributeKey[A], value: A) { | |
| def toTuple: (AttributeKey[A], A) = (key, value) | |
| } | |
| class RequestWithAttributes[A](request: Request[A], attributes: TrieMap[AttributeKey[_], Any]) extends WrappedRequest[A](request) { | |
| def get[B](key: AttributeKey[B]): Option[B] = attributes.get(key).asInstanceOf[Option[B]] | |
| def set[B](key: AttributeKey[B], value: B): RequestWithAttributes[A] = { | |
| attributes.put(key, value) | |
| this | |
| } | |
| def getAll[T](implicit classTag: ClassTag[T]) = { | |
| attributes.filterKeys { | |
| case p: T => true | |
| case _ => false | |
| } | |
| } | |
| } |
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