[Lift] (Scala and Lift) and (GWT and Google App Engine) A Double Marriage Made In Heaven?

[mal3]

Hi David,

I saw your Twitter post a month ago

"Walked out of a very bad keynote ... coding is more fun ... looking
forward to learning about GWT"

Do you see ways to incorporate GWT into Lift?

Regards, Mal.

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[Lift] Re: Customizing Javascript

[sailormoo...@gmail.com]

Here is the current solution. It's not clean, but I cannot think of
better idea for the code.

 bind("entry", xhtml,
  "js_realtimeoutput" -> {Unparsed
(js_realtime_output(room_day, room))})

private def js_realtime_output(room_day: RoomDay, room: Room) : String
= {
def date_string(datetime : GregorianCalendar) : String  = {
  String.format("new Date(%s,%s,%s,%s,%s,%s)",
datetime.get(Calendar.YEAR).toString, datetime.get
(Calendar.MONTH).toString,
datetime.get(Calendar.DAY_OF_MONTH).toString, datetime.get
(Calendar.HOUR_OF_DAY).toString,
datetime.get(Calendar.MINUTE).toString, datetime.get
(Calendar.SECOND).toString)
}

val s_datetime = new GregorianCalendar()
val e_datetime = new GregorianCalendar()
if (room_day.day_no.is == 0) {
   """function realtime_output() {
 php_now = """ + date_string(s_datetime) + """;
 local_now = new Date();
 diff_sec = Math.floor( (local_now - php_now) / 1000);
 document.realtime_form.realtime_output.value = "伺服器與本地時間差：" +
diff_sec + "秒";
   }"""
} else {
  s_datetime.setTime(room_day.created.is)
  e_datetime.setTime(room_day.created.is)

  var until_string = ""
  if (room_day.day_no.is % 2 == 0) {
e_datetime.add(Calendar.MINUTE, room.day_minutes.is)
until_string = "日落"
  } else {
e_datetime.add(Calendar.MINUTE, room.night_minutes.is)
until_string = "早上"
  }

  """starttime = """ + date_string(s_datetime) + """;
  endtime   = """ + date_string(e_datetime) + """;
  diffseconds = Math.floor((endtime - starttime)/1000);
  function realtime_output() {
nowtime = new Date();
leftseconds = diffseconds - Math.floor((nowtime - starttime)/
1000);
lefttime = new Date(0,0,0,0,0,leftseconds);
virtual_left_seconds = Math.floor(12*60*60*(leftseconds /
diffseconds));
virtual_lefttime = new Date(0,0,0,0,0,virtual_left_seconds);
if(leftseconds > 0){
  document.realtime_form.realtime_output.value = "　""" +
until_string + """剩餘 " + virtual_lefttime.getHours()+"時
間"+virtual_lefttime.getMinutes()+"分 (實際時間 "+lefttime.getMinutes()
+"分"+lefttime.getSeconds()+"秒)";
} else {
  overseconds = Math.abs(leftseconds);
  overtime = new Date(0,0,0,0,0,overseconds);
  document.realtime_form.realtime_output.value = "超過時間
"+overtime.getMinutes()+"分"+overtime.getSeconds()+"秒";
}
tid = setTimeout('realtime_output()', 1000);
  }"""
}
  }

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[Lift] About Scala XML Manipulation

[sailormoo...@gmail.com]

Hi :

  I want to ask why the  won't appear in the following XML code.
  And if I want to make such effect ? the "if" is inside an outer tag
following by a previous tag, how could I do ?
  Thanks

scala> {if(1==1) }
res26: scala.xml.Elem = 


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[Lift] how to serve html fragments

[george]

hello all,

hopefully someone can help me out here.

i am trying to port some simple ajax stuff over to lift from a rails
app. basically it just loads an html fragment and puts it into the dom
using prototype.

i have set up a template which contains the fragment at src/main/
webapp/fragment.html

item

then i made the page available using the SiteMap and all seems good,
but here comes the problem

the lift response adds the xml declaration and doctype, one of which
seems to cause prototype some problems



item

so the question is, how can i make lift send back the raw html without
meddling with it?

i have tried out using ResourceServer to serve it statically which
works, but this wouldn't allow me to generate the fragment
dynamically.

i would also prefer to have a separate html template file rather than
embedding the markup code in a snippet.

any thoughts gratefully received..

george

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[Lift] Re: About Scala XML Manipulation

[David Pollak]

Howdy,
Try this at the Scala REPL (the Scala command line):
scala> if (true) 

scala>

The type of a if expression (without and else) is always Unit.  Unit is
always blank in XML, and thus you never get anything.

Please change to if (true)  else NodeSeq.Empty

scala> import scala.xml._
import scala.xml._

scala> if (true)  else NodeSeq.Empty
res1: scala.xml.NodeSeq = 

And it works.

Thanks,

David

On Sun, Apr 26, 2009 at 3:51 AM, sailormoo...@gmail.com <
sailormoo...@gmail.com> wrote:

>
> Hi :
>
>  I want to ask why the  won't appear in the following XML code.
>  And if I want to make such effect ? the "if" is inside an outer tag
> following by a previous tag, how could I do ?
>  Thanks
>
> scala> {if(1==1) }
> res26: scala.xml.Elem = 
>
>
> >
>


-- 
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp

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[Lift] Re: (Scala and Lift) and (GWT and Google App Engine) A Double Marriage Made In Heaven?

[David Pollak]

On Sat, Apr 25, 2009 at 11:07 PM, mal3  wrote:

>
> Hi David,
>
> I saw your Twitter post a month ago
>
> "Walked out of a very bad keynote ... coding is more fun ... looking
> forward to learning about GWT"
>
> Do you see ways to incorporate GWT into Lift?


Not really.

GWT is all about Java.  There's no way to do GWT client code in Scala.  Lex
Spoon works at Google.  And I hear he works on the GWT team.  If he can't
get Scala support for GWT, it's not going to happen.

Also, I'm just not a fan of the GWT model.

However, because Lift does web services very well, it could be the back end
to your GWT app.

I expect that the stuff we're doing with the Bespin folks will yield a much
better way of building client side apps.


>
>
> Regards, Mal.
>
> >
>


-- 
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp

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[Lift] Re: Customizing Javascript

[marius d.]

Oh wow ... no offense but I haven't seen such code in a while :) .. I
see the code but it's difficult to understand the problem that you are
trying to solve ... looks like you are building a clock. For building
reasonable small JavaScript I'd recommend using Lif't's JavaScript
abstraction (JsExp/JsCmd etc). For bigger JS code I'd recommend
writing the JavaScript code in the JS file and define your own
JavaScript objects.

So what I'd do:

1. Define the JavaScript function in a separate .js file (the function
may be part of a JS JSON object )
2. The function would take a JSON structure as argument
3. From the Lift's snippet generate the JSON structure that needs to
be passed to you function using JsObj and generate the  tag
(using xml literals or even use the JsCmds.Script object). Potentially
use JqOnLoad so that
your function to be called after the DOM tree is loaded



Br's,
Marius

On Apr 26, 1:31 pm, "sailormoo...@gmail.com" 
wrote:
> Here is the current solution. It's not clean, but I cannot think of
> better idea for the code.
>
>  bind("entry", xhtml,
>   "js_realtimeoutput" ->