Thanks, Derek. I read the updated PDF version of the book on "The
Lift Book" group. I think it looks good. I think an example with
redirectTo may be better than link. Also, personally, I'm not sure if
I understand StatefulSnippet now. It doesn't seem like you can mix
the two. I updated my code to no longer use StatefulSnippet and to
just use requestVars and the S.redirectTo with state function. I now
use RequestVars to hold my form values for error validation. I also
read these same values on the redirected page to confirm the values
back to the user, such as "you searched for 'query'".
On Apr 18, 8:41 pm, Derek Chen-Becker <dchenbec...@gmail.com> wrote:
> OK, I just added some more explanation on passing state between snippets to
> section 3.15 in the book. I just uploaded a new PDF. When you have a chance
> could you look at it and let me know if that makes sense? Also, I wasn't
> sure if this should be a separate section ("Passing Data Between Snippets" ?
> ) or not. Thoughts?
>
> Derek
>
> On Sat, Apr 18, 2009 at 6:08 PM, Derek Chen-Becker
> <dchenbec...@gmail.com>wrote:
>
> > A RequestVar is only "live" for the duration of the request, and a
> > redirectTo ends up sending a 307 temp redirect to the browser, which results
> > in a new request. S.redirectTo does have an overload that allows you to pass
> > a function that will be called when the redirected request is handled. Some
> > skeleton code that uses this would look like:
>
> > ...
> > object myVar extends RequestVar[String]("")
>
> > def mySnippet (...) ... {
> > def processSubmit () {
> > ...
> > val currentMyVar = myVar.is
> > S.redirectTo("/newPage", () => myVar(currentMyVar))
> > }
> > ...
> > }
>
> > Notice that we need to introduce a "capture" val to hold the current value
> > so that the closure function can re-set it when the redirect is processed.
> > We briefly discuss this in the book, but I'll see about adding a more
> > concrete example that discusses the approaches to passing state around
> > between snippets.
>
> > Derek
>
> > On Sat, Apr 18, 2009 at 3:23 PM, bradford <fingerm...@gmail.com> wrote:
>
> >> Thanks, Tim. I worked around that issue.
>
> >> I would still like to know whether or not it's possible have
> >> RequestVars carry over to the redirected page. I'm attaching a
> >> modified demo. If I use just a var, it will maintain the state. If I
> >> use RequestVar, it won't transfer the state.
>
> >> Well.. I couldn't find the attach button in Google Groups. Here's the
> >> pasted code: (a modification of the Test.scala file found here:
>
> >>http://groups.google.com/group/liftweb/browse_thread/thread/db1e4631a...
> >> ).
>
> >> package com.foo.snippet
>
> >> import scala.xml.{NodeSeq,Text}
>
> >> import net.liftweb.http._
> >> import net.liftweb.util.Helpers
> >> import S._
> >> import Helpers._
>
> >> class TestSnippet extends StatefulSnippet {
> >> val dispatch : DispatchIt = {
> >> case "add" => add _
> >> case "show" => show _
> >> }
>
> >> object name extends RequestVar("empty")
>
> >> def add (xhtml : NodeSeq) : NodeSeq = {
> >> def doSubmit () = {
> >> println("Name = " + name)
> >> this.redirectTo("/show")
> >> }
>
> >> bind("form", xhtml,
> >> "name" -> SHtml.text(name.is, name(_)),
> >> "submit" -> SHtml.submit("Add", doSubmit))
> >> }
>
> >> def show (xhtml : NodeSeq) : NodeSeq = {
> >> bind("display", xhtml, "name" -> Text(name.is))
> >> }
> >> }
>
> >> On Apr 18, 2:18 pm, Timothy Perrett <timo...@getintheloop.eu> wrote:
> >> > Its talking about Hibernate session, not lift session. Perhaps you have
> >> a
> >> > detached model or something your trying to work on?
>
> >> > Cheers, Tim
>
> >> > On 18/04/2009 19:08, "bradford" <fingerm...@gmail.com> wrote:
>
> >> > > no session or session was
> >> > > closed
>
> >> > > I'll look into this some more.
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