The problem is very simple. You're only binding to the <srvstat:up/> tag. Please update:
bind("up" -> upText, "down" -> downText)
With that being said, polling for changes doesn't make much sense. I'd
suggest only redrawing when you get a message that a server has gone
up/down.
On Wed, Jan 20, 2010 at 9:19 AM, Donald McLean <dmclea...@gmail.com> wrote:
> I am a total newbie trying to learn Scala and Lift. It is a near
> certainty that my problem is a misunderstanding of something simple so
> please don't assume that I have a clue.
>
> My organization is performing a technology evaluation and the winning
> technology will be used for an upcoming project. Scala/Lift is the
> first technology to be evaluated.
>
> As part of the evaluation, we are going to implement a handful of
> small items in each technology so that we can evaluate them on factors
> such as ease of learning and ease of modifying.
>
> The first feature that we are going to start with is a simple comet
> bit that reports the summary of the system server status - number of
> servers that are up vs number that are down. Determining these two
> numbers is hard but displaying them looks like it should be reasonably
> easy - if I could understand it enough to make it work.
>
> I'm starting with the comet example from section 9.5.2 of "Exploring Lift".
>
> I have a block in my HTML file and I also have a class "ServerStatus".
> The result is the error message at the end of this message (with the
> arrow showing that srvstat is the unbound prefix).
>
> What am I missing?
>
> Thank you,
>
> Donald
>
> ----- HTML snippet-----
> <lift:comet type="ServerStatus" name="Other">
> Servers up: <srvstat:up>don't know</srvstat:up>
> Servers down: <srvstat:down>don't know</srvstat:down>
> </lift:comet>
>
> ----- file ServerStatus.scala -----
>
> package demo.helloworld.comet
>
> import net.liftweb.http.CometActor
> import net.liftweb.http.js.JsCmds.SetHtml
> import java.util.Date
>
> import xml.Text
> import net.liftweb.util.{ActorPing, Full, Helpers}
>
> class ServerStatus extends CometActor {
> override def defaultPrefix = Full("srvstat")
>
> def upCount: Int = 5
> def downCount: Int = 6
>
> def render = bind("up" -> upText)
> def upText = (<span id="up">
> {upCount}
> </span>)
>
> def downText = (<span id="down">
> {downCount}
> </span>)
>
> // schedule a ping every 10 seconds so we redraw
> val tickSpan: Helpers.TimeSpan = Helpers.intToTimeSpan(10000)
> ActorPing.schedule(this, Tick, tickSpan)
>
> override def lowPriority: PartialFunction[Any, Unit] = {
> case Tick => {
> println("Got tick " + new Date());
> partialUpdate(SetHtml("up", Text(upCount.toString)))
> partialUpdate(SetHtml("down", Text(downCount.toString)))
> // schedule an update in 10 seconds
> ActorPing.schedule(this, Tick, tickSpan)
> }
> }
> }
> case object Tick
>
> ----- Error Message -----
> XML Parsing Error: prefix not bound to a namespace
> Location: http://mcproto.translab.stsci.edu:8080/liftdemo/
> Line Number 22, Column 23: Servers down: <srvstat:down>don't
> know</srvstat:down>
> ----------------------^
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--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
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