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Lift talk
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Lift Framework Winston
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Winston@Fliptop Shares the basics of the amazing scala web framework: lift at JUG and Scala Taiwan.
Transcript of Lift talk
Lift Framework!
Winston!
Topics!
2!
• Coding Monk/Winston • View First v.s. MVC
• Version Assump9ons & Configura9ons
• Template – snippet & value binding
• Javascript from LiE
• Ajax & Coment
• Fast & Easy API • My Love & Pain with LiE
Slide and Sample Project!
3!
• hMp://engineering.fliptop.com/2012/08/25/
Coding Monk/Winston!
4!
• Love wine/Learning Whiskey • Love scala/java, python, liE, django • Struts -‐> Struts 2 -‐> Spring -‐> django -‐> rails -‐> liE
• Wish List: big data/data mining/machine learning, the architecture and algorithm
• Having a lot of fun at fliptop
The problem with MVC!
5!
• MVC Architecture Graph • Because complex HTML pages rarely contain a dominant piece of logic... a single controller... but contain many different components.
• We end up pu]ng a lot of logic into a single controller and view.
The problem with MVC!
6!
A Giant Controller!
7!
Lift!
8!
• you define the collec9on of components to be rendered in the resul9ng HTML page in the view.
• Simple and Clear
Lift!
9!
Lift!
10!
Assumptions!
11!
• Use maven to set up LiE • Use XHTML liE, not HTML5 liE
• HTML5 StyleSnippet:
• XHTML Style Snippet:
Start Up a lift project!
12!
mvn archetype:generate \ -‐DarchetypeGroupId=net.liEweb \
-‐DarchetypeAr9factId=liE-‐archetype-‐basic_2.8.1 \
-‐DarchetypeVersion=2.3 \
-‐DarchetypeRepository=hMp://scala-‐tools.org/repo-‐releases \
-‐DremoteRepositories=hMp://scala-‐tools.org/repo-‐releases \
-‐DgroupId=com.fliptop.liE \ -‐Dar9factId=fliptop_rocks \
-‐Dversion=1.0
Project Structure!
13!
Run it!!
14!
• mvn jeMy:run • hMp://localhost:8080
• You now got ProtoUser Module (we won’t cover today) with AddUserMenusAEer set up for you. (More on ProtoUser: hMp://blog.thegodcode.net/post/141132296/super-‐quick-‐start-‐with-‐liEs-‐protouser)
Boot.scala!
15!
• No xml configura9on! Pure code!!
• LiERules • DB, Proper9es and Run modes
• SiteMap: – Menu – Access Control
Create a page!
16!
• Set up a path in Boot.scala • Create an HTML page in webapp or a view class in class folder.
• Fill in the snippets if using HTML pages.
• Request Rou9ng: – Template -‐> View – We are using Template, not view
Snippet 101!
17!
• snippet101.html <liE:surround with="default" at="content”> <liE:SnippetExp.snipprt101/> </liE:surround>
• SnippetExp.scala class SnippetExp { def snipprt101:NodeSeq = <div>This is a very bad prac9ce!!</div> }
Bad Practice!
18!
• A lot of HTML in a snippet code class SnippetExp { def thisIsBad:NodeSeq = { val goodCode = false val badCode = if(goodCode) “not at all” else “bad prac9ce, HTML in snippet!!” <div>{badCode}</div> } }
Complex Snippet: data binding!
19!
• simple_form.html <liE:surround with="default" at="content”> <liE:SnippetExp.bindingExample form="POST”> <p>Do Something with your email:</p> <p><entry:email/></p> <p><entry:submit/></p> </liE:SnippetExp.bindingExample> </liE:surround>
A Simple Form Snippet!
20!
def bindingExample(xhtml:NodeSeq):NodeSeq = {
var email = ""
def process (){
print("The email is: " + email)
}
bind("entry", xhtml,
“email” -‐> SHtml.text(email, email = _, "id”>"email"),
"submit" -‐> SHtml.submit("search", process))
}
Recursive Binding!
21!
• Rendering a list or a table • recursive_binding.html
<liE:SnippetExp.recursiveBinding>
<table>
<entry:lis9tem>
<tr>
<td><item:name/></td><td><item:email/></td>
</tr>
</entry:lis9tem>
</table>
</liE:SnippetExp.recursiveBinding>
Recursive Binding!
22!
def recursiveBinding(xhtml:NodeSeq):NodeSeq = {
val theList = new ListBuffer[(String, String)]
theList += new Tuple2("[email protected]", "Robbie Cheng")
theList += new Tuple2("[email protected]", "Winston Chen") bind("entry", xhtml, "lis9tem" -‐> theList.toList.flatMap(
item => {
bind("item", chooseTemplate("entry","lis9tem", xhtml),
"email" -‐> item._1,
"name" -‐> item._2 )
}
)
)
}
Javascript Integration!
23!
• Javascript expressions and statements • Javascript forms
• Ajax • Comet (Long pulling)
Javascript Expressions/Statements!
24!
• The magic Call func9on <script>
func9on this_is_an_alert_triggered_by_liE_call(){
alert("This is an alert triggered by liE call()!!") }
</script>
<liE:JsSnippetExp.call> <input id="buMon" type="buMon" value="Click me" />
</liE:JsSnippetExp.call>
Snippet:
def call = "#buMon [onclick]" #> JE.Call("this_is_an_alert_triggered_by_liE_call", "").toJsCmd
Json Forms!
25!
• Let’s look at the code directly: JsSnippetExp
Ajax!
26!
• Template: <liE:JsSnippetExp.ajaxBuMon>
<item:buMon/>
</liE:JsSnippetExp.ajaxBuMon>
<div id="ajaxb"></div>
• Snippet: def updateText = SetHtml("ajaxb", Text("Fliptop is a great company!!"))
def ajaxBuMon(xhtml:NodeSeq):NodeSeq = bind("item", xhtml, "buMon" -‐> SHtml.ajaxBuMon(Text("Press me"), ()=>updateText))
Comet!
Ajax!
Comet!
Comet!
Comet!
29!
• Lift: Long Pulling!• Must put comets in comet folder.!• Extend CometActor!• Use tag: <lift:comet> !
• Letʼs look at the code: CometExp.scala!• Reference:
exploring.liftweb.net/master/index-11.html!
REST API So Easy!
30!
• Use RestHelper to write up the code. • Configure it on Boot.scala
• Let’s look at Rest.scala • Here you go!! It’s that easy. • Reference: simply.liEweb.net/index-‐Chapter-‐11.html
Conclusions!
31!
• LiE tackles Web from a view-‐first perspec9ve. • LiE gives you js/ajax/comet for free.
• LiE also gives you rest API for free.
• All feature goes to backend, designs frontend. • No more plumbing yourself.
Why I love Lift!
32!
• Get all the feature done at backend • The Snippet logic makes much more sense than MVC for me. (although I love django too)
• API so easy, no much code needed
Why I hate Lift!
33!
• It’s really hard to get HTML/XML out of snippet code.
• Learning curve is s9ff if you are not used to its logic.
• Try s9ck to the latest version. • Too many ways to write it.
Free Books!
34!
• Exploring LiE: exploring.liEweb.net • Simply LiE: simply.liEweb.net
• LiE Cookbook: cookbook.liEweb.net
References!
35!
• David Pollak On LiE Framework and Scala www.infoq.com/interviews/LiE-‐Scala-‐David-‐Pollak
• Example & Demo Site: demo.liEweb.net
• Start Up Project with Maven: www.assembla.com/wiki/show/liEweb/Using_Maven
Get to me!
36!
• Email: [email protected] • URLs: – hMp://www.repfans.com/profile/33335/Winston%20Chen
– hMp://careers.stackoverflow.com/wingchen
The last Q&A!
Winston!
Model!
38!
• Mapper or Record
• Take a look at here: stackoverflow.com/ques9ons/6564332/when-‐to-‐use-‐mapper-‐or-‐record-‐in-‐liE
Menu Configurations!
39!
• stackoverflow.com/ques9ons/2175246/liEweb-‐menu-‐customiza9on
Thank you.!
