Boot.scala

package bootstrap.liftweb

import _root_.net.liftweb.common._
import _root_.net.liftweb.util._
import _root_.net.liftweb.http._
import _root_.net.liftweb.sitemap._
import _root_.net.liftweb.sitemap.Loc._
import Helpers._

/**
  * A class that's instantiated early and run.  It allows the application
  * to modify lift's environment
  */
class Boot {
  def boot {
    println("In boot")
    getClass.getClassLoader match {
      case rcl: java.net.URLClassLoader =>
        println("Classpath:" + rcl.getURLs.mkString("\n  ", "\n  ",""))
    }
    
    // where to search snippet
    LiftRules.addToPackages("reactive.web")

    reactive.web.Reactions.initComet
    
    // Build SiteMap
    val entries = Menu(Loc("Home", List("index"), "Home")) :: 
    Menu(Loc("Clock", List("clock"), "Clock")) :: 
    Menu(Loc("Echo", List("echo"), "Echo")) :: 
    Nil
    LiftRules.setSiteMap(SiteMap(entries:_*))
  }
}

clock.html

<lift:surround with="default" at="content">

  <!-- 必須 -->
  <div class="lift:reactive" />
  
  <!-- CSS Selector Snippet (Lift2.2 or later) -->
  <div class="lift:ClockCSSSnippet">
     <span id="clock" />
  </div>

  <!-- Old Snippet -->
  <lift:clockOldSnippet >
     <ns:clock />
  </lift:clockOldSnippet >
  
</lift:surround>

ClockSnippet.scala

package reactive
package web
package snippet

import _root_.scala.xml._
import net.liftweb.util.{Helpers, BindPlus}
  import Helpers._
  import BindPlus._
import net.liftweb.http._

class ClockCSSSnippet extends ReactiveSnippet {

  val clockES = new Timer(interval = 1000, cancel = ()=> !isPageAlive)
  val clockSig = clockES.hold(0L)
  val clockSpan = Span( clockSig.map( t => Text((new java.util.Date).toString )) )
  
  def render = "#clock" #> clockSpan
}

class ClockOldSnippet extends ReactiveSnippet{

  val clockES = new Timer(interval = 1000, cancel = ()=> !isPageAlive)
  val clockSig = clockES.hold(0L)
  val clockSpan = Span( clockSig.map( t => Text((new java.util.Date).toString )) )
  
  def render(xhtml:NodeSeq) :NodeSeq = 
    bind( "ns", xhtml, "clock" -> clockSpan )

}

echo.html

<lift:surround with="default" at="content">
 
  <div class="lift:reactive" />
  
  <div class="lift:EchoSnippet">
    <input id="field" /><br />
    エコー: "<span id="echo"/>"<br />
  </div>

</lift:surround>

EchoSnippet.scala

package reactive
package web
package snippet

import _root_.scala.xml._

import net.liftweb.util.{Helpers, BindPlus}
  import Helpers._
  import BindPlus._
import net.liftweb.http._

class EchoSnippet extends ReactiveSnippet {

  val field = TextInput()
  field.value updateOn field.keyUp
  
  val fieldValue = field.value.value map { v => 
    println( "passed from client:"+v );
    Text(v)
  }
  println( fieldValue ); //MappedSignal
  
  val echo = Span( fieldValue )
  
  def render =
    "#field" #> field &
    "#echo" #> echo
}