Well if you logically expected it to be read but it wasn't, it might indicate a
bug to you or help in diagnosis.
I'm not sure I understand your reply fully -- when you added myId.is did the
log message go away? If not, could you post your code?
-Ross
On Dec 7, 2009, at 9:39 PM, Xuefeng Wu wrote:
> I use myId.is but get nothing.
> I don't know what I could do with the information.
>
> On Tue, Dec 8, 2009 at 10:19 AM, Ross Mellgren <dri...@gmail.com> wrote:
> I think that message is just informative, letting you know that you don't
> seem to be using the request var fully (perhaps due to typo, or code
> refactoring that made it unused, or something.)
>
> I think it'll go away if you access the variable somewhere using myId.is.
>
> -Ross
>
> On Dec 7, 2009, at 9:02 PM, Xuefeng Wu wrote:
>
>> Hi ,
>>
>> When I use RequestVar get the message: RequestVar ....... was set but not
>> read
>>
>> My code like this:
>> object MyMgr {
>> ...
>> Loc.Snippet("myFoo",myFoo)
>> ...
>> object myId extends RequestVar[Long](0)
>>
>> def myFoo(xhtml: NodeSeq): NodeSeq = {
>> ....
>> def selectNode = {
>>
>> myId .set(vId)
>>
>> }
>> ....
>> bind("",xhtml,
>> "node"->a(() => selectNode, Text(nodeName))
>> )
>> }
>>
>> }
>>
>> the RequestVar must be used at Class?
>>
>> On Sat, Nov 21, 2009 at 12:09 AM, Ross Mellgren <dri...@gmail.com> wrote:
>> RequestVar is the standard way of doing this. For example
>>
>> object MySharedInformation {
>> object myData extends RequestVar[List[Thing]](loadThings)
>> // ^^^^^^^^^^^ ^^^^^^^^^^
>> // Type of thing to store How to initialize
>> variable first time it's accessed
>>
>> private def loadThings: List[Thing] = ...
>> }
>>
>> class Snippet1 {
>> import MySharedInformation.myData
>> def render(ns: NodeSeq): NodeSeq = {
>> myData.is.map(thing => { ... })
>> }
>> }
>>
>> class Snippet2 {
>> import MySharedInformation.myData
>> ...
>> }
>>
>> The lifetime of the value is during the current request processing and
>> any AJAX calls related to it.
>>
>> If you really want to initialize it in a snippet, then use a Box with
>> a RequestVar, like this:
>>
>> object MySharedInformation {
>> object myData extends RequestVar[Box[List[Thing]]](Empty)
>> }
>>
>> class LoaderSnippet {
>> import MySharedInformation.myData
>> def render(ns: NodeSeq): NodeSeq = {
>> myData.set(Full(...))
>> }
>> }
>>
>> class ReaderSnippet {
>> import MySharedInformation.myData
>> def render(ns: NodeSeq): NodeSeq = {
>> // If the data has not been loaded, default to an empty list
>> val data = myData.is.openOr(Nil)
>> ...
>> }
>> }
>>
>> class OtherReaderSnippet {
>> import MySharedInformation.myData
>> def render(ns: NodeSeq): NodeSeq = {
>> // Do two entirely different things if the data has versus
>> has not been loaded
>> myData.is match {
>> case Full(data) => // do something when the data has been
>> loaded
>> case _ => // do something when the data has not been loaded
>> }
>> }
>> }
>>
>> HTH,
>> -Ross
>>
>>
>> On Nov 20, 2009, at 10:59 AM, Alex Black wrote:
>>
>> > I've got a template page, say foobar.html, that makes a number of
>> > calls to functions in a snippet, e.g. mysnippet.foo1, mysnippet.foo2,
>> > mysnippet.foo3.
>> >
>> > I'd like to do some initial work in foo1, e.g. retrieve some data and
>> > do some work on it, then in foo2 and foo3 display parts of that data.
>> >
>> > Whats the easiest way to do this? I think I misunderstood the lift
>> > book:
>> >
>> > "That means that for each request, Lift creates a new instance of the
>> > snippet class to execute. Any changes you make to instance variables
>> > will be discarded after the request is processed."
>> >
>> > I thought this meant that for a given HTTP request, there would be one
>> > (and only one) instance of my snippet, so I could call several of its
>> > methods and they could all access the snippet's member variables,
>> > which would then be discarded at the end of the request.
>> >
>> > Am I going about this wrong? should I only have one snippet function
>> > per template?
>> >
>> > Thx
>> >
>> > - Alex
>> >
>> > --
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