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Getting started with Lift
       Richard Dallaway, @d6y
         richard@taykt.com
lsug.org
London Scala UG - Lift:Getting started with Scala
Struts       Play      GWT        Seam

 Rails    Spring MVC    JSF     WebObjects

Grails       PHP       Cocoon     Seaside

Stripes    JAX-RS      Wicket      Lift
Struts       Play        GWT       Seam

        Rails    Spring MVC      JSF    WebObjects

       Grails       PHP        Cocoon     Seaside

       Stripes    JAX-RS       Wicket      Lift

Zero                                                Plenty
                           Weirdness
http://liftweb.net
Versions

1.0.3   Updated Jan 2010

2.0 M2 Released Feb 2010


  both for Scala 2.7.7
London Scala UG - Lift:Getting started with Scala
London Scala UG - Lift:Getting started with Scala
$ find . -name lift* -depth 2 -type d

lift-base/lift-actor          lift-modules/lift-paypal
lift-base/lift-common         lift-modules/lift-testkit
lift-base/lift-json           lift-modules/lift-textile
lift-base/lift-util           lift-modules/lift-widgets
lift-base/lift-webkit         lift-modules/lift-wizard
                              lift-modules/lift-xmpp
lift-modules/lift-amqp
lift-modules/lift-facebook    lift-persistence/lift-couchdb
lift-modules/lift-imaging     lift-persistence/lift-jpa
lift-modules/lift-jta         lift-persistence/lift-mapper
lift-modules/lift-ldap        lift-persistence/lift-record
lift-modules/lift-machine
lift-modules/lift-oauth
lift-modules/lift-openid
lift-modules/lift-osgi
Agenda

• Part I: View first
• Part II: Doing stuff quickly
• Part III: Ajax
• Part IV: Real time web
The time on this server is: Mon Mar 08 18:40:51 GMT 2010.
<html xmlns="http://www.w3.org/1999/xhtml">
 <body>
   <h1>Hello world</h1>

  <p>The time on this server is:
       <lift:Time.now>
          time appears here
       </lift:Time.now>
  </p>

 </body>
</html>
package com.myproject.snippet

import scala.xml.NodeSeq

class Time {

    // My <lift:Time.now /> implementation:
    def now(xhtml: NodeSeq) =
        <span>{new java.util.Date()}</span>

}
<html xmlns="http://www.w3.org/1999/xhtml">
 <body>
   <h1>Hello world</h1>

  <lift:Time.now>
   <p>It’s <when:day/> at <when:hour/>.</p>
  </lift:Time.now>

 </body>
</html>
package com.myproject.snippet

import scala.xml.{NodeSeq,Text}
import net.liftweb.util.Helpers._

class Time {

    def now(xhtml:NodeSeq) = {
      val day = "Monday"
      val hour = "7 o'clock"
      bind("when", xhtml,
       "hour" -> <span>{hour}</span>,
       "day" -> Text(day) )
    }
}
London Scala UG - Lift:Getting started with Scala
<html xmlns="http://www.w3.org/1999/xhtml">

<body>

<h1>Hello Canada</h1>

<lift:Olympics.results>
    <table>
        <table:rows>
        <tr>
             <td><r:country>Country here</r:country></td>
             <td><r:golds>Gold medal count</r:golds></td>
        </tr>
        </table:rows>
    </table>
</lift:Olympics.results>

</body>


</html>
package com.myprojects.snippet

import scala.xml.NodeSeq
import net.liftweb.util.Helpers._

class Olympics {

    case class Golds(country: String, medals: Int)

    def results(xhtml: NodeSeq) = {

        val vancouver = Golds("CAN", 14) :: Golds("GER", 10) ::
                        Golds("GBR", 1) :: Nil

        // <table:rows> <r:country/> <r:golds/> </table:rows>
        bind("table", xhtml,
        ! ! "rows" -> vancouver.flatMap( gold =>
                 bind("r", chooseTemplate("table", "rows", xhtml),
                       "country" -> gold.country,
                       "golds" -> gold.medals )
                 )
        )
    }

}
London Scala UG - Lift:Getting started with Scala
$ mvn archetype:generate 
 -DarchetypeCatalog=http://scala-tools.org/
Choose archetype:
1: http://scala-tools.org/ -> scala-archetype-simple (A simple scala project)
2: http://scala-tools.org/ -> lift-archetype-blank (A blank/empty liftweb project)
3: http://scala-tools.org/ -> lift-archetype-basic (A basic liftweb project (with DB, css, ...))
Choose a number: (1/2/3):
$ mvn archetype:generate 
 -DarchetypeGroupId=net.liftweb 
 -DarchetypeArtifactId=lift-archetype-blank 
 -DarchetypeVersion=2.0-M2 
 -DremoteRepositories=http://scala-tools.org/repo-releases 
 -DgroupId=com.example.proj
package com.brightonbloggers.admin.model

import   net.liftweb.common._
import   net.liftweb.util._
import   net.liftweb.mapper._
import   net.liftweb.http._

class Blog extends LongKeyedMapper[Blog] with IdPK {

  def getSingleton = Blog

  object title extends MappedString(this, 20)

  object url extends MappedString(this, 100) {
    override def validations = isUrl _ :: super.validations
  }

  def isUrl(u:String) = if (url startsWith "http")
!     ! !   !   !   !   !    Nil
!     ! !   !   !   !   else
!     ! !   !   !   !   !    List(FieldError(url, S.?("field.url.error")))
}

object Blog extends Blog with LongKeyedMetaMapper[Blog] with CRUDify[Long,Blog]
{
}
<lift:surround with="default" at="content">

    <h1>Ajax blog</h1>

    <div id="list">

    <lift:Blogs.list>

        <ul>
           <directory:entry />
        </ul>

        <directory:new_blog />

    </lift:Blogs.list>

    </div>

</lift:surround>
import com.brightonbloggers.admin.model.Blog

import     scala.xml._
import     net.liftweb.common._
import     net.liftweb.mapper._
import     net.liftweb.http.SHtml._
import     net.liftweb.http.js.JsCmds._
import     net.liftweb.util.Helpers._
import     net.liftweb.http.S._

class Blogs {

        def list(xhtml: NodeSeq): NodeSeq = {
!
        def add_new_blog(s: String) = {
          Blog.create.url(s).title(s).save
          SetHtml( "list", list(xhtml) )
        }

        bind("directory", xhtml,
        ! ! "entry" -> Blog.findAll().flatMap(
                               b => <li>{b.url}</li> ),
        ! ! "new_blog" -> ajaxText("", add_new_blog _)
        )

    }

}
package com.brightonbloggers.admin.snippet

import com.brightonbloggers.admin.model.Blog

import     scala.xml._
import     net.liftweb.common._
import     net.liftweb.mapper._
import     net.liftweb.http.SHtml._
import     net.liftweb.http.js.JsCmds._
import     net.liftweb.util.Helpers._
import     net.liftweb.http.S._

class Blogs {

    def list(xhtml: NodeSeq): NodeSeq = {
!
        def add_new_blog(s: String) = {
          Blog.create.url(s).title(s).save
          SetHtml("list", list(xhtml) )
        }

        def update_blog(blog: Blog)(new_value: String) = {
           blog.url(new_value).save
           SetHtml("list", list(xhtml) )
        }

        def click_to_edit(blog: Blog) : NodeSeq =
        !!   swappable( <li>{blog.url}</li>,
        !!   !           ajaxText(blog.url, update_blog(blog) _ ) )

        bind("directory", xhtml,
        !!   "entry" -> Blog.findAll().flatMap( click_to_edit _ ),
        !!   "new_blog" -> ajaxText("", add_new_blog _)
        )

    }
}
London Scala UG - Lift:Getting started with Scala
User Activity




                                                                    Client Processing




                                 Comet Event Bus
                         Event
                                                   Initialization

                                                   Data Push
                         Event                                                          Displa
                                                                                               y
                                                   Data Push
                                                                                        Displa
                                                                                               y



                         Event
                                                   Data Push
                         Event                                                          Displa
                                                                                               y
                                                   Data Push
                                                                                        Displa
                                                                                               y


                         Event
                                                   Data Push
Server-Side Processing


                                                                                        Displa
                                                                                               y
def list(xhtml: NodeSeq): NodeSeq = {
!
     def countable(blog: Blog) : NodeSeq =
     !    <li>{link("/static/list",
            () => { StatsServer ! blog },
             Text(blog.url)) }</li>

     bind("directory", xhtml,
     ! ! "entry" -> Blog.findAll().flatMap(countable _)
     )
package com.brightonbloggers.admin.comet

import   net.liftweb.http._
import   net.liftweb.common._
import   net.liftweb.util.Helpers._
import   net.liftweb.http.js._
import   net.liftweb.actor._
import   net.liftweb.http.js.JsCmds._
import   scala.xml._

object StatsServer extends LiftActor with ListenerManager {

    var count = 0

    override def lowPriority = {
      case b =>
        count = count + 1
        updateListeners()
    }

    def createUpdate = count
}


// <lift:comet type=”StatsWatch” />
class StatsWatch extends CometActor with CometListenee {

    def registerWith = StatsServer

    override def render = <div id="total">0</div>

    override def lowPriority = {
      case count: Int =>
        partialUpdate(SetHtml("total", Text(count.toString)))
    }

}
Thank you.
• Lift book: http://groups.google.com/group/
  the-lift-book
• Liftweb.net: Wiki, mailing list, getting started
  guide
• Visit lsug.org, join the meetup.com group
apress discount code

 LONDONSCALAUQUCUAVGLT
Next Meeting

 Traits & Mixins
 Kevin
 Monday 12 April
 Here, Skillsmatter
London Scala UG - Lift:Getting started with Scala

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London Scala UG - Lift:Getting started with Scala

  • 1. Getting started with Lift Richard Dallaway, @d6y richard@taykt.com
  • 4. Struts Play GWT Seam Rails Spring MVC JSF WebObjects Grails PHP Cocoon Seaside Stripes JAX-RS Wicket Lift
  • 5. Struts Play GWT Seam Rails Spring MVC JSF WebObjects Grails PHP Cocoon Seaside Stripes JAX-RS Wicket Lift Zero Plenty Weirdness
  • 7. Versions 1.0.3 Updated Jan 2010 2.0 M2 Released Feb 2010 both for Scala 2.7.7
  • 10. $ find . -name lift* -depth 2 -type d lift-base/lift-actor lift-modules/lift-paypal lift-base/lift-common lift-modules/lift-testkit lift-base/lift-json lift-modules/lift-textile lift-base/lift-util lift-modules/lift-widgets lift-base/lift-webkit lift-modules/lift-wizard lift-modules/lift-xmpp lift-modules/lift-amqp lift-modules/lift-facebook lift-persistence/lift-couchdb lift-modules/lift-imaging lift-persistence/lift-jpa lift-modules/lift-jta lift-persistence/lift-mapper lift-modules/lift-ldap lift-persistence/lift-record lift-modules/lift-machine lift-modules/lift-oauth lift-modules/lift-openid lift-modules/lift-osgi
  • 11. Agenda • Part I: View first • Part II: Doing stuff quickly • Part III: Ajax • Part IV: Real time web
  • 12. The time on this server is: Mon Mar 08 18:40:51 GMT 2010.
  • 13. <html xmlns="http://www.w3.org/1999/xhtml"> <body> <h1>Hello world</h1> <p>The time on this server is: <lift:Time.now> time appears here </lift:Time.now> </p> </body> </html>
  • 14. package com.myproject.snippet import scala.xml.NodeSeq class Time { // My <lift:Time.now /> implementation: def now(xhtml: NodeSeq) = <span>{new java.util.Date()}</span> }
  • 15. <html xmlns="http://www.w3.org/1999/xhtml"> <body> <h1>Hello world</h1> <lift:Time.now> <p>It’s <when:day/> at <when:hour/>.</p> </lift:Time.now> </body> </html>
  • 16. package com.myproject.snippet import scala.xml.{NodeSeq,Text} import net.liftweb.util.Helpers._ class Time { def now(xhtml:NodeSeq) = { val day = "Monday" val hour = "7 o'clock" bind("when", xhtml, "hour" -> <span>{hour}</span>, "day" -> Text(day) ) } }
  • 18. <html xmlns="http://www.w3.org/1999/xhtml"> <body> <h1>Hello Canada</h1> <lift:Olympics.results> <table> <table:rows> <tr> <td><r:country>Country here</r:country></td> <td><r:golds>Gold medal count</r:golds></td> </tr> </table:rows> </table> </lift:Olympics.results> </body> </html>
  • 19. package com.myprojects.snippet import scala.xml.NodeSeq import net.liftweb.util.Helpers._ class Olympics { case class Golds(country: String, medals: Int) def results(xhtml: NodeSeq) = { val vancouver = Golds("CAN", 14) :: Golds("GER", 10) :: Golds("GBR", 1) :: Nil // <table:rows> <r:country/> <r:golds/> </table:rows> bind("table", xhtml, ! ! "rows" -> vancouver.flatMap( gold => bind("r", chooseTemplate("table", "rows", xhtml), "country" -> gold.country, "golds" -> gold.medals ) ) ) } }
  • 21. $ mvn archetype:generate -DarchetypeCatalog=http://scala-tools.org/ Choose archetype: 1: http://scala-tools.org/ -> scala-archetype-simple (A simple scala project) 2: http://scala-tools.org/ -> lift-archetype-blank (A blank/empty liftweb project) 3: http://scala-tools.org/ -> lift-archetype-basic (A basic liftweb project (with DB, css, ...)) Choose a number: (1/2/3):
  • 22. $ mvn archetype:generate -DarchetypeGroupId=net.liftweb -DarchetypeArtifactId=lift-archetype-blank -DarchetypeVersion=2.0-M2 -DremoteRepositories=http://scala-tools.org/repo-releases -DgroupId=com.example.proj
  • 23. package com.brightonbloggers.admin.model import net.liftweb.common._ import net.liftweb.util._ import net.liftweb.mapper._ import net.liftweb.http._ class Blog extends LongKeyedMapper[Blog] with IdPK { def getSingleton = Blog object title extends MappedString(this, 20) object url extends MappedString(this, 100) { override def validations = isUrl _ :: super.validations } def isUrl(u:String) = if (url startsWith "http") ! ! ! ! ! ! ! Nil ! ! ! ! ! ! else ! ! ! ! ! ! ! List(FieldError(url, S.?("field.url.error"))) } object Blog extends Blog with LongKeyedMetaMapper[Blog] with CRUDify[Long,Blog] { }
  • 24. <lift:surround with="default" at="content"> <h1>Ajax blog</h1> <div id="list"> <lift:Blogs.list> <ul> <directory:entry /> </ul> <directory:new_blog /> </lift:Blogs.list> </div> </lift:surround>
  • 25. import com.brightonbloggers.admin.model.Blog import scala.xml._ import net.liftweb.common._ import net.liftweb.mapper._ import net.liftweb.http.SHtml._ import net.liftweb.http.js.JsCmds._ import net.liftweb.util.Helpers._ import net.liftweb.http.S._ class Blogs { def list(xhtml: NodeSeq): NodeSeq = { ! def add_new_blog(s: String) = { Blog.create.url(s).title(s).save SetHtml( "list", list(xhtml) ) } bind("directory", xhtml, ! ! "entry" -> Blog.findAll().flatMap( b => <li>{b.url}</li> ), ! ! "new_blog" -> ajaxText("", add_new_blog _) ) } }
  • 26. package com.brightonbloggers.admin.snippet import com.brightonbloggers.admin.model.Blog import scala.xml._ import net.liftweb.common._ import net.liftweb.mapper._ import net.liftweb.http.SHtml._ import net.liftweb.http.js.JsCmds._ import net.liftweb.util.Helpers._ import net.liftweb.http.S._ class Blogs { def list(xhtml: NodeSeq): NodeSeq = { ! def add_new_blog(s: String) = { Blog.create.url(s).title(s).save SetHtml("list", list(xhtml) ) } def update_blog(blog: Blog)(new_value: String) = { blog.url(new_value).save SetHtml("list", list(xhtml) ) } def click_to_edit(blog: Blog) : NodeSeq = !! swappable( <li>{blog.url}</li>, !! ! ajaxText(blog.url, update_blog(blog) _ ) ) bind("directory", xhtml, !! "entry" -> Blog.findAll().flatMap( click_to_edit _ ), !! "new_blog" -> ajaxText("", add_new_blog _) ) } }
  • 28. User Activity Client Processing Comet Event Bus Event Initialization Data Push Event Displa y Data Push Displa y Event Data Push Event Displa y Data Push Displa y Event Data Push Server-Side Processing Displa y
  • 29. def list(xhtml: NodeSeq): NodeSeq = { ! def countable(blog: Blog) : NodeSeq = ! <li>{link("/static/list", () => { StatsServer ! blog }, Text(blog.url)) }</li> bind("directory", xhtml, ! ! "entry" -> Blog.findAll().flatMap(countable _) )
  • 30. package com.brightonbloggers.admin.comet import net.liftweb.http._ import net.liftweb.common._ import net.liftweb.util.Helpers._ import net.liftweb.http.js._ import net.liftweb.actor._ import net.liftweb.http.js.JsCmds._ import scala.xml._ object StatsServer extends LiftActor with ListenerManager { var count = 0 override def lowPriority = { case b => count = count + 1 updateListeners() } def createUpdate = count } // <lift:comet type=”StatsWatch” /> class StatsWatch extends CometActor with CometListenee { def registerWith = StatsServer override def render = <div id="total">0</div> override def lowPriority = { case count: Int => partialUpdate(SetHtml("total", Text(count.toString))) } }
  • 31. Thank you. • Lift book: http://groups.google.com/group/ the-lift-book • Liftweb.net: Wiki, mailing list, getting started guide • Visit lsug.org, join the meetup.com group
  • 32. apress discount code LONDONSCALAUQUCUAVGLT
  • 33. Next Meeting Traits & Mixins Kevin Monday 12 April Here, Skillsmatter