On Mon, Dec 7, 2009 at 9:14 PM, Xuefeng Wu <ben...@gmail.com> wrote:
> Hi David & Ross,
>
> Thank you for your help,
> I understand RequestVar now, which muse be used in the same request.
>
> My case is that I have a tree and a separate button.
> When use click the tree node, the separate button should know which node is
> selected.
>
Without understanding how def *doCompetenceB*(xhtml: NodeSeq,msg:
String,competence: Competence): NodeSeq = { is called as part of the Ajax
callback, I can't give you any advice. Sorry.
>
> Right now I replace the separate button when use click the tree node and it
> worked.
> I don't want to use session and I think it's better not replace the button.
> But I don't have idea how to do.
>
> On Tue, Dec 8, 2009 at 12:49 PM, David Pollak <
> feeder.of.the.be...@gmail.com> wrote:
>
>>
>>
>> On Mon, Dec 7, 2009 at 8:46 PM, Xuefeng Wu <ben...@gmail.com> wrote:
>>
>>> My current solution is that when user select a tree node, I replace the
>>> add button dependence on the node.
>>
>>
>> If you can create a very simple example of what you're trying to do, we
>> can help you debug the actual, runnable code.
>>
>>
>>>
>>>
>>> 2009/12/8 Xuefeng Wu <ben...@gmail.com>
>>>
>>> Hi Ross,
>>>>
>>>> Yes it's not in the same request.
>>>>
>>>> My case is:
>>>> When user select a tree node, I want to store this nodeId and If user
>>>> click a button to create a child node, I want to get the selected node.
>>>>
>>>> I use ModalDialog when user click the button to create now node.
>>>>
>>>> On Tue, Dec 8, 2009 at 11:50 AM, Ross Mellgren <dri...@gmail.com>wrote:
>>>>
>>>>> I'm sorry, I'm having trouble following your code, I think too much of
>>>>> the surrounding code and templates is missing for me to reason about why
>>>>> you
>>>>> would have a problem.
>>>>>
>>>>> I set up a quick example app, so maybe the code from that will help
>>>>> you. It is here:
>>>>>
>>>>> http://github.com/Dridus/test-rqvarlog
>>>>>
>>>>> If I understand you correctly, you're getting a log message like this
>>>>> one:
>>>>> WARN - RequestVar test.snippet.HelloWorld$myVar$_ was set but not read
>>>>>
>>>>> This message is from the code I posted:
>>>>>
>>>>> package test.snippet
>>>>>
>>>>> import _root_.scala.xml.NodeSeq
>>>>> import _root_.net.liftweb.http.RequestVar
>>>>> import _root_.net.liftweb.util.Helpers
>>>>> import Helpers._
>>>>>
>>>>> class HelloWorld {
>>>>> object myVar extends RequestVar[Int](0)
>>>>>
>>>>> def howdy(in: NodeSeq): NodeSeq = Helpers.bind("b", in, "time" ->
>>>>> (new _root_.java.util.Date).toString)
>>>>>
>>>>> def increment(in: NodeSeq): NodeSeq = {
>>>>> myVar.set(myVar.is + 1)
>>>>> <div>increment called</div>
>>>>> }
>>>>>
>>>>> def show(in: NodeSeq): NodeSeq = <div>show called -- myVar.is {
>>>>> myVar.is }</div>
>>>>> }
>>>>>
>>>>>
>>>>> <lift:surround with="default" at="content">
>>>>> <h2>Welcome to your project!</h2>
>>>>> <p>
>>>>> <lift:helloWorld.howdy>
>>>>> <span>Welcome to test-rqvarlog at <b:time/></span>
>>>>> </lift:helloWorld.howdy>
>>>>>
>>>>> <lift:HelloWorld.increment />
>>>>> <lift:HelloWorld.increment />
>>>>> <!-- <lift:HelloWorld.show /> -->
>>>>> </p>
>>>>> </lift:surround>
>>>>>
>>>>> If I uncomment the line with HelloWorld.show in the template, the log
>>>>> message goes away because myVar.is is called.
>>>>>
>>>>> If you are still getting the message, then that should mean that you
>>>>> are not calling myVar.is in the same request.
>>>>>
>>>>> HTH,
>>>>> -Ross
>>>>>
>>>>> On Dec 7, 2009, at 10:28 PM, Xuefeng Wu wrote:
>>>>>
>>>>> My code :
>>>>>
>>>>>
>>>>> object CompetenceMgr {
>>>>>
>>>>> Menu(Loc("Competence", List("competence", "index"), S.?("Competence"),
>>>>> ifIsLoggedIn,
>>>>> ...
>>>>> Loc.Snippet("buildCompetenceDicRows", buildCompetenceDicRows),
>>>>> Loc.Snippet("addCompetenceB", addCompetenceB),
>>>>> ....
>>>>>
>>>>> private object *_categoryId *extends RequestVar[Long](0)
>>>>>
>>>>> //build a competenceDic table
>>>>> def buildCompetenceDicRows(xhtml: NodeSeq): NodeSeq = {
>>>>> ... ...
>>>>> def *makeCategoryRow*(r: Category) = {
>>>>> .....
>>>>> def *categoryNode*: NodeSeq = {
>>>>> def categoryNodeLinkId = "categoryNodeLinkId-" + r.id
>>>>> def selectCategoryNode: JsCmd = {
>>>>> * //here: set the _categoryId, but didn't work*
>>>>> _categoryId.set(r.id.is)
>>>>> ... ..
>>>>> }
>>>>> <span id={categoryNodeLinkId} class='node_span'>{a(() =>
>>>>> selectCategoryNode, Text(r.title.is))}</span>
>>>>> }
>>>>> <tr ><td><span class="folder draggable droppable"
>>>>> id={categoeryId}>{categoryNode}</span></td></tr> % ("id" -> nodeId) %
>>>>> ("class" -> nodeClass)
>>>>> }
>>>>> def *buildCategoryRows*: NodeSeq = {
>>>>> val resourceData = Category.categoriesTreeList
>>>>> (empty /: resourceData)((l, r) => l ++ *makeCategoryRow*(r))
>>>>> }
>>>>> *buildCategoryRows*
>>>>> }
>>>>>
>>>>> //it's a button for create competence
>>>>> def *addCompetenceB*(xhtml: NodeSeq): NodeSeq =
>>>>> doCompetenceB(xhtml,"add Competence",null)
>>>>> //a button for create or edit competence
>>>>> def *doCompetenceB*(xhtml: NodeSeq,msg: String,competence:
>>>>> Competence): NodeSeq = {
>>>>> a(() => {
>>>>> *//here I try to get the categoryId if it selected.*
>>>>> val catId: Long = _categoryId.is
>>>>> S.runTemplate(List("competence","_competence")).
>>>>> map(ns =>
>>>>> ModalDialog(doCompetenceEditor(ns,catId,competence))) openOr
>>>>> Alert("Couldn't find _competence template")},
>>>>> Text(msg),"class" -> "button"
>>>>> )
>>>>> }
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Tue, Dec 8, 2009 at 11:02 AM, Ross Mellgren <dri...@gmail.com>wrote:
>>>>>
>>>>>> 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.isdid
>>>>>> 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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>>>>>>>>
>>>>>>>
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>>>>>>
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