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Refs To Components

react 0.14 supports two types of refs( string based and callback). In future string ref's are going to be obsolete

The next big (and probably most invasive change for a while) will be replacing string refs. Most can be automatically converted. #reactjs Use callback refs e.g. this.node = n} /> to avoid having to do any upgrade work. Allows you to move work from life-cycles too

so Sri only supports callback refs.

Refs to Scala Components

Let's say we have a Child component which has public method hideMe(), and in Parent component we're rendering child component, after render if we want to invoke childs hideMe() method then we must get reference to child component.

object Parent {
  @ScalaJSDefined
  class Component extends ReactComponent[Unit, Unit] {
    def render() = div(null,Child(ref = storeChildRef _))
    var childRef: Child.Component = _
    def storeChildRef(cref: Child.Component) = {
      childRef = cref // store reference to use later
      childRef.hideMe() // invoke actions
    }
  }
  def apply(key: js.UndefOr[String] = js.undefined, ref: js.Function1[Component, Unit] = null) =
    makeElementNoProps[Component](key, ref)
}

object Child {
  @ScalaJSDefined
  class Component extends ReactComponent[Unit, Unit] {
    def render() = div(null, "Child Component")
    def hideMe() = {
      println(s"Ok done!.")
    }
  }
  def apply(key: js.UndefOr[String] = js.undefined, ref: js.Function1[Component, Unit] = null) =
    makeElementNoProps[Component](key, ref)
}
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