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 >>>>>> > >>>>>> > -- >>>>>> > >>>>>> > You received this message because you are subscribed to the Google >>>>>> > Groups "Lift" group. >>>>>> > To post to this group, send email to lift...@googlegroups.com. >>>>>> > To unsubscribe from this group, send email to >>>>>> liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com> >>>>>> > . >>>>>> > For more options, visit this group at >>>>>> http://groups.google.com/group/liftweb?hl= >>>>>> > . >>>>>> > >>>>>> > >>>>>> >>>>>> -- >>>>>> >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Lift" group. >>>>>> To post to this group, send email to lift...@googlegroups.com. >>>>>> To unsubscribe from this group, send email to >>>>>> liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com> >>>>>> . >>>>>> For more options, visit this group at >>>>>> http://groups.google.com/group/liftweb?hl=. >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Scala中文社区: http://groups.google.com/group/scalacn >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Lift" group. >>>>> To post to this group, send email to lift...@googlegroups.com. >>>>> To unsubscribe from this group, send email to >>>>> liftweb+unsubscr...@googlegroups.com. >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/liftweb?hl=en. >>>>> >>>>> >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Lift" group. >>>>> To post to this group, send email to lift...@googlegroups.com. >>>>> To unsubscribe from this group, send email to >>>>> liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com> >>>>> . >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/liftweb?hl=en. >>>>> >>>> >>>> >>>> >>>> -- >>>> Scala中文社区: http://groups.google.com/group/scalacn >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Lift" group. >>>> To post to this group, send email to lift...@googlegroups.com. >>>> To unsubscribe from this group, send email to >>>> liftweb+unsubscr...@googlegroups.com. >>>> For more options, visit this group at >>>> http://groups.google.com/group/liftweb?hl=en. >>>> >>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Lift" group. >>>> To post to this group, send email to lift...@googlegroups.com. >>>> To unsubscribe from this group, send email to >>>> liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com> >>>> . >>>> For more options, visit this group at >>>> http://groups.google.com/group/liftweb?hl=en. >>>> >>> >>> >>> >>> -- >>> Scala中文社区: http://groups.google.com/group/scalacn >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Lift" group. >>> To post to this group, send email to lift...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> liftweb+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/liftweb?hl=en. >>> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Lift" group. >>> To post to this group, send email to lift...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/liftweb?hl=en. >>> >> >> >> >> -- >> Scala中文社区: http://groups.google.com/group/scalacn >> > > > > -- > Scala中文社区: http://groups.google.com/group/scalacn > > -- > You received this message because you are subscribed to the Google Groups > "Lift" group. > To post to this group, send email to lift...@googlegroups.com. > To unsubscribe from this group, send email to > liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/liftweb?hl=en. > -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics -- You received this message because you are subscribed to the Google Groups "Lift" group. 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