W-JAX 09 - Lift

Das Web-Framework für Scala
Heiko Seeberger

Copyright WeigleWilczek 2009

WARUM SIND WIR EIGENTLICH HIER?

“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 ...”

Michael Galpin, Developer, eBay

2

WARUM NOCH EIN WEB-FRAMEWORK?
Lift pickt Rosinen von
anderen Frameworks

Lift bringt eigene
innovative Ansätze

3

DEMO: CHAT MIT 20 ZEILEN SCALA CODE

4

FÜR’S PROTOKOLL

• Projekt generieren mit mvn archetype:generate ...

• ChatServer.scala anlegen

• Chat.scala anlegen

• chat.xhtml Template anlegen

• In Boot.scala neues Menu zur SiteMap hinzufügen

5

DIE ANFÄNGE
David Pollak Einfach zu benutzen

Scala with Sails Sicher
2006

Keep the meaning
with the bytes Einfach zu deployen

6

HEUTE
Lift 1.1 vor der Tür Sehr rege Community

Etliche Sites powered by Lift 32 Committer

7

FEATURES IM ANGEBOT

Templates Sitemap

Comet Persistenz

AJAX User Management

8

“MUSTERLÖSUNG”

9

WEITERE FEATURES (UNVOLLSTÄNDIG)

Wizards JPA und JTA

OpenID JSON

AMPQ OSGi

Textile PayPay

10

WIE SCHREIBEN WIR TEMPLATES?

<html>
<head>
In XHTML
<title>kix</title>
...
<body>
<div class="container">
...
<div class="span-18 last">
<lift:Msgs showAll="true"/>
mit Lift-Tags <lift:bind name="content"/>
...
</div>
<div class="span-12" style="text-align: center;">
<img src="/images/pbww.png"/>
</div>
...

12

TEMPLATES VERSCHACHTELN

<lift:bind ... />

<lift:surround ...>

13

SNIPPETS EINBINDEN
class Games {
Snippet def upcoming5(xhtml: NodeSeq) =
bind("games", xhtml, "list" -> bindGames(Game upcoming 5, xhtml))

<lift:surround with="default" at="content">
...
<lift:Games.upcoming5> Snippet-Tag
<games:list>
<tr game:class="">
<td><span game:id=""><game:action/></span></td>
<td><game:date/></td>
<td><game:group/></td> Platzhalter im
<td><game:location/></td>
<td><game:teams/></td> Namespace game
...

14

SNIPPETS UND BINDING

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,
...
Platzhalter ersetzen

15

MENÜS UND ZUGRIFFSKONTROLLE

18

SITEMAP ANLEGEN

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 : _*)

19

MENÜS ANZEIGEN

<html>
<head>
<title>kix</title>
...
<body>
<div class="container">
...
<div class="span-5">
<div class="menu">
<lift:Menu.builder/>
</div>
...

20

MAPPER
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
23

CRUD SUPPORT

... with CRUDify[Long, Game]

24

SCHEMA ANLEGEN

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)

25

CLAUSTHALER-PRINZIP

28

MORE THAN JUST CRUD

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)
}

29

BEISPIEL: LISTEN-ELEMENTE LÖSCHEN

32

SCALA API FÜR AJAX

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))

33

CHATTEN LEICHT GEMACHT

36

FRAGEN / DISKUSSION

37

DANKE

Kontakt: seeberger@weiglewilczek.com

Mehr lernen: www.scalatraining.net

38

W-JAX 09 - Lift

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