Declare variable in a Play2 scala template

Question

How do you declare and initialize a variable to be used locally in a Play2 Scala template?

I have this:

@var title : String = \"Home\"

Answer 1

There is one obvious solution which looks quite clean and may be preferred sometimes: define a scope around the template, define your variable inside of it, and let the scope produce the html code you need, like this:

@{
  val title = "Home"

  
Welcome on {title}
}

This has some drawbacks:

• you are generating your html as Scala NodeSeq this way, which may be limiting sometimes
• there is a performance issue with this solution: the code inside of @{ seems to be compiled runtime, because the Scala code generated for the page loooks like this (some usual Twirl stuff deleted):

The generated code:

...    

Seq[Any](format.raw/*1.1*/("""

    
        
        
    
    

        """),_display_(/*9.10*/{
            val title = "Home"

                
Welcome on {title}
        }),format.raw/*15.10*/("""

    """),format.raw/*17.5*/("""
"""))
      }
    }
  }

...