doCompetenceB render a button which user click and will pop a dialog for
create a competence.
*The competence have category property, I want this pop dialog know the
category which user already selected from the category tree.
*
On Thu, Dec 10, 2009 at 7:19 AM, David Pollak <feeder.of.the.be...@gmail.com
> wrote:
>
>
> 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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>>>
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