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Lift - Das Web-Framework für Scala
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Copyright WeigleWilczek 2009
Das Web-Framework für ScalaHeiko Seeberger
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“Lift is the only new framework in the last four years to offer fresh and innovative approaches to web development. It's not just some
incremental improvements over the status quo, it redefines the state of the art. If you are a web developer, you should learn Lift ...”
WARUM SIND WIR EIGENTLICH HIER?
Michael Galpin, Developer, eBay
WARUM NOCH EIN WEB-FRAMEWORK?
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Lift pickt Rosinen von anderen Frameworks
Lift bringt eigene innovative Ansätze
DEMO: CHAT MIT 20 ZEILEN SCALA CODE
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FÜR’S PROTOKOLL
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• Projekt generieren mit mvn archetype:generate ...
• ChatServer.scala anlegen
• Chat.scala anlegen
• chat.xhtml Template anlegen
• In Boot.scala neues Menu zur SiteMap hinzufügen
DIE ANFÄNGE
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2006
David Pollak Einfach zu benutzen
Sicher
Einfach zu deployenKeep the meaning
with the bytes
Scala with Sails
HEUTE
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Lift 1.1 vor der Tür Sehr rege Community
Etliche Sites powered by Lift 32 Committer
FEATURES IM ANGEBOT
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Templates
Persistenz
AJAX
Comet
User Management
Sitemap
“MUSTERLÖSUNG”
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WEITERE FEATURES (UNVOLLSTÄNDIG)
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JSON
JPA und JTA
Textile
Wizards
PayPay
AMPQ
OpenID
OSGi
TEMPLATES
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<html> <head> <title>kix</title> ... <body> <div class="container"> ... <div class="span-18 last"> <lift:Msgs showAll="true"/> <lift:bind name="content"/> ... </div> <div class="span-12" style="text-align: center;"> <img src="/images/pbww.png"/> </div> ...
mit Lift-Tags
WIE SCHREIBEN WIR TEMPLATES?
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In XHTML
TEMPLATES VERSCHACHTELN
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<lift:surround ...>
<lift:bind ... />
class Games { def upcoming5(xhtml: NodeSeq) = bind("games", xhtml, "list" -> bindGames(Game upcoming 5, xhtml))
<lift:surround with="default" at="content"> ... <lift:Games.upcoming5> <games:list> <tr game:class=""> <td><span game:id=""><game:action/></span></td> <td><game:date/></td> <td><game:group/></td> <td><game:location/></td> <td><game:teams/></td> ...
SNIPPETS EINBINDEN
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Snippet-Tag
Platzhalter imNamespace game
Snippet
class Games {
def upcoming5(xhtml: NodeSeq) = bind("games", xhtml, "list" -> bindGames(Game upcoming 5, xhtml))
private def bindGames(games: List[Game], xhtml: NodeSeq) = { val oddOrEven = OddOrEven() games flatMap { game => bind("game", chooseTemplate("games", "list", xhtml), "date" -> format(game.date.is, locale), "group" -> game.group.is.toString, "location" -> game.location.is, ...
SNIPPETS UND BINDING
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Platzhalter ersetzen
LIVE DEMO
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SITEMAP
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MENÜS UND ZUGRIFFSKONTROLLE
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SITEMAP ANLEGEN
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val ifAdmin = If(() => User.superUser_?, () => RedirectResponse("/index"))
val homeMenu = Menu(Loc("home", ("index" :: Nil) -> false, "Home"))...val adminMenu = Menu(Loc("admin", ("admin" :: Nil) -> true, "Admin", ifAdmin), adminSubMenu: _*)
val menus = homeMenu :: ... adminMenu :: User.sitemap
LiftRules setSiteMap SiteMap(menus : _*)
MENÜS ANZEIGEN
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<html> <head> <title>kix</title> ... <body> <div class="container"> ... <div class="span-5"> <div class="menu"> <lift:Menu.builder/> </div> ...
LIVE DEMO
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PERSISTENZ
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MAPPER
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class Game extends LongKeyedMapper[Game] with IdPK {
object group extends MappedEnum(this, Group) { override def displayName = ?("Group") }
object team1 extends MappedTeam(this, "Team 1")
object team2 extends MappedTeam(this, "Team 2")
object date extends MappedDateTime(this) { override def displayName = ?("Date") }
object location extends MappedString(this, 100) { override def displayName = ?("Location") } ... Keep the meaning
with the bytes
CRUD SUPPORT
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... with CRUDify[Long, Game]
SCHEMA ANLEGEN
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val dbVendor = new StandardDBVendor(Props get "db.driver" openOr "org.h2.Driver", Props get "db.url" openOr "jdbc:h2:kix", Empty, Empty) { override def maxPoolSize = Props getInt "db.pool.size" openOr 3}DB.defineConnectionManager(DefaultConnectionIdentifier, dbVendor)Schemifier.schemify(true, Log.infoF _, Team, Game, Result, Tip, User)
LIVE DEMO
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USER MANAGEMENT
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CLAUSTHALER-PRINZIP
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MORE THAN JUST CRUD
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class User extends MegaProtoUser[User] {
override def shortName = { val s = super.shortName val i = s indexOf "@" if (i == -1) s else s.substring(0, i) }
override def firstNameDisplayName = ?("Name")
object points extends MappedInt(this)}
LIVE DEMO
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AJAX SUPPORT
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BEISPIEL: LISTEN-ELEMENTE LÖSCHEN
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SCALA API FÜR AJAX
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def editDelete(tip: Tip) = { def delete = { Tip delete_! tip SetHtml(tip.id.is.toString, NodeSeq.Empty) } renderEditDelete(tip, delete _)}
private def renderEditDelete(tip: Tip, jsCmd: () => JsCmd) = link("/tips/edit", () => currentTip(Full(tip)), editImg) ++ Text("") ++ ajaxDeleteImg(ajaxInvoke(jsCmd))
LIVE DEMO
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COMET SUPPORT
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CHATTEN LEICHT GEMACHT
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FRAGEN / DISKUSSION
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DANKE
Kontakt: seeberger@weiglewilczek.com
Mehr lernen: www.scalatraining.net
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