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.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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>>
>>
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