Trait

scala.scalajs.js

JSApp

Related Doc: package js

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trait JSApp extends AnyRef

Old-style base class for top-level, entry point main objects.

JSApp provides two services to an object Foo that extends it. These two services are replaced by two different features, starting with Scala.js 0.6.18.

Discoverability by sbt as main object

Since Scala.js 0.6.18, the sbt plugin can recognize "standard" main methods of the form

def main(args: Array[String]): Unit = ...

in objects, even if they do not extend JSApp. Use such a main method to replace JSApp in the context of discoverability by sbt.

To enable it as main method, make sure you also set

scalaJSUseMainModuleInitializer := true

in your project settings.

Automatic export to JavaScript

Given

package bar

object Foo extends js.JSApp {
  def main(): Unit = println("Hello world!")
}

the object Foo and its main method are automatically exported such that JavaScript code can call

bar.Foo().main();

To achieve exactly the same behavior without JSApp, define Foo as

package bar

object Foo {
  @JSExportTopLevel("bar.Foo")
  protected def getInstance(): this.type = this

  @JSExport
  def main(): Unit = println("Hello world!")
}

Alternatively, you can define it as

package bar

object Foo {
  @JSExportTopLevel("bar.Foo.main")
  def main(): Unit = println("Hello world!")
}

but in that case, the JavaScript code will have to be changed to

bar.Foo.main()
Annotations
@deprecated @JSExportDescendentObjects()
Deprecated

(Since version 0.6.20) Consult the Scaladoc of js.JSApp for migration tips.

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Inherited
  1. JSApp
  2. AnyRef
  3. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Abstract Value Members

  1. abstract def main(): Unit

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    Annotations
    @JSExport()

Concrete Value Members

  1. final def !=(arg0: scala.Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. def +(other: String): String

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    Implicit information
    This member is added by an implicit conversion from JSApp to any2stringadd[JSApp] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (JSApp, B)

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    Implicit information
    This member is added by an implicit conversion from JSApp to ArrowAssoc[JSApp] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: scala.Any): Boolean

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    Definition Classes
    AnyRef → Any
  6. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  7. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  8. def ensuring(cond: (JSApp) ⇒ Boolean, msg: ⇒ scala.Any): JSApp

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    Implicit information
    This member is added by an implicit conversion from JSApp to Ensuring[JSApp] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  9. def ensuring(cond: (JSApp) ⇒ Boolean): JSApp

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    Implicit information
    This member is added by an implicit conversion from JSApp to Ensuring[JSApp] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: Boolean, msg: ⇒ scala.Any): JSApp

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    Implicit information
    This member is added by an implicit conversion from JSApp to Ensuring[JSApp] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean): JSApp

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    Implicit information
    This member is added by an implicit conversion from JSApp to Ensuring[JSApp] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  13. def equals(arg0: scala.Any): Boolean

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    Definition Classes
    AnyRef → Any
  14. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  15. def formatted(fmtstr: String): String

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    Implicit information
    This member is added by an implicit conversion from JSApp to StringFormat[JSApp] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  16. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  17. def hashCode(): Int

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    Definition Classes
    AnyRef → Any
  18. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  19. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  20. final def notify(): Unit

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    Definition Classes
    AnyRef
  21. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  22. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  23. def toString(): String

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    Definition Classes
    AnyRef → Any
  24. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  25. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  26. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  27. def [B](y: B): (JSApp, B)

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    Implicit information
    This member is added by an implicit conversion from JSApp to ArrowAssoc[JSApp] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from AnyRef

Inherited from scala.Any

Inherited by implicit conversion any2stringadd from JSApp to any2stringadd[JSApp]

Inherited by implicit conversion StringFormat from JSApp to StringFormat[JSApp]

Inherited by implicit conversion Ensuring from JSApp to Ensuring[JSApp]

Inherited by implicit conversion ArrowAssoc from JSApp to ArrowAssoc[JSApp]

Ungrouped