onsubmit def

gistfile1.scala

def onSubmit (func: (String) ⇒ Any): (NodeSeq) ⇒ NodeSeq
execute the String function when the form is submitted. This method returns a function that can be applied to form fields (input, button, textarea, select) and the function is executed when the form containing the field is submitted.

object ChatIn {
​
  /**
   * The render method in this case returns a function
   * that transforms NodeSeq => NodeSeq.  In this case,
   * the function transforms a form input element by attaching
   * behavior to the input.  The behavior is to send a message
   * to the ChatServer and then returns JavaScript which
   * clears the input.
   */
  def render = SHtml.onSubmit(s => {
    ChatServer ! s
    SetValById("chat_in", "")
  })
}