A new Lift Chat App screencast

David Pollak

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Nov 12, 2010, 3:08:14 PM11/12/10

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Enjoy: http://liftweb.blip.tv/file/4374370/

The HTML Template:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"><head>


   <meta content="text/html; charset=UTF-8" http-equiv="content-type" />
   <title>Home</title>


  </head><body class="lift:content_id=main">

   <div id="main" class="lift:surround?with=default;at=content">
   <h2>Welcome to your project!</h2>

   This is my chat app, baby<br />
   <ul class="lift:comet?type=Chat">

<li>Chat Line 1</li>

<li class="clearable">Chat Line 2</li>

<li class="clearable">Chat line 3<br />

</li>

   </ul>
   <form action="/" class="lift:form.ajax"><input id="chat_in" class="lift:ChatIn" name="foo" /><br />

<input value="say something" type="submit" /></form>

   <br />
   <p> <span class="lift:helloWorld.howdy"> Welcome to your Lift app at <span id="time">Time goes here</span> </span> </p>

   </div>

</body></html>

The Chat.scala file:

package code

package comet

import net.liftweb._

import http._
import actor._
import util._

import Helpers._

object ChatServer extends LiftActor with ListenerManager {

  private var msgs = Vector("Welcome")

  def createUpdate = msgs

  override def lowPriority = {

   case s: String => msgs :+= s; updateListeners()
  }

}

class Chat extends CometActor with CometListener {

  private var msgs: Vector[String] = Vector()

  def registerWith = ChatServer

  override def lowPriority = {

   case v: Vector[String] => msgs = v; reRender()
  }

  def render = "li *" #> msgs & ClearClearable

}

And the ChatIn.scala snippet:

package code
package snippet

import net.liftweb._
import http._

import js._
import JsCmds._
import JE._

import comet.ChatServer

object ChatIn {
  def render = SHtml.onSubmit(s => {

   ChatServer ! s
   SetValById("chat_in", "")

  })
}

TylerWeir

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Nov 12, 2010, 3:54:55 PM11/12/10

to Lift

Nice, downloaded.

On Nov 12, 3:08 pm, David Pollak <feeder.of.the.be...@gmail.com>
wrote:

David Pollak

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Nov 12, 2010, 3:59:35 PM11/12/10

to lif...@googlegroups.com

On Fri, Nov 12, 2010 at 12:54 PM, TylerWeir <tyler...@gmail.com> wrote:

Nice, downloaded.

For a higher resolution, Ogg encoded version: http://tunaforcats.com/chat_screencast.ogg

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Heiko Seeberger

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Nov 13, 2010, 4:09:38 AM11/13/10

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Amazing! Much "better" than "before". I like the designer-friendly templates and the onSubmit thing a lot.

Heiko

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Naftoli Gugenheim

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Nov 13, 2010, 9:42:37 PM11/13/10

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Now what's the line count comparison to what language was it that someone once posted about that makes comet very concise? ;)

sorenbs

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Nov 14, 2010, 10:55:12 AM11/14/10

to Lift

So this is Lifts counterpart to the rails "build a blog app in 15
minutes."

Pretty cool

On Nov 12, 9:08 pm, David Pollak <feeder.of.the.be...@gmail.com>
wrote:

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