On 22 feb., 04:12, Luke Nezda <lne...@gmail.com> wrote:
> Hello,
>
> I am new to Scala and Lift. I am having a problem using 2 features
> together which seem to work fine individually. Here's a simplified
> piece of the code:
>
> class Ajax {
> def someResult(q:String) = <span>some results for query {q}...</
> span>
> // searchField closure
> def searchField(xhtml: NodeSeq): NodeSeq = {
> // build up an ajax text box
> def doSearch(msg: NodeSeq) = {
> // doesn't compile with bind: "searchBox" -%> doSearch _
> FocusOnLoad(SHtml.ajaxText("", q => SetHtml("resultz",
> someResult(q))))
> // compiles with bind: "searchBox" -%> doSearch _
> // SHtml.ajaxText("", q => SetHtml("resultz", someResult(q)))
> }
> // bind the view to the functionality
> bind("ajax", xhtml,
> "searchBox" -> doSearch _
> // doesn't compile if doSearch returns result of FocusOnLoad
> //"searchBox" -%> doSearch _
> )
> }
>
> }
>
> and the template invocation:
>
> <lift:surround with="default" at="content">
> <lift:Ajax.searchField id_msgs="messages">
> <ajax:searchBox class="text" type="search" tabindex="1" />
> <hr class="space"/>
> <div id="resultz"></div>
> <div id="messages"></div>
> </lift:Ajax.searchField>
> </lift:surround>
>
> My goal is an Ajax-enabled text input that gets focus when the page
> loads and has various attributes of the input element set. I realize
> I can use the SHtml.ajaxText variant that takes attribute-value pairs,
> as in:
>
> FocusOnLoad(SHtml.ajaxText("", q => SetHtml("resultz",
> Yawni.query(q)), ("class", "text"), ("type", "search"), ("tabindex",
> "1")))
>
> but I'm trying to keep the various element attributes in the template.
>
> When I try to bind with:
> "searchBox" -%> doSearch _
> instead of:
> "searchBox" -> doSearch _
>
> I get the following compile error:
>
> snippet/Ajax.scala:109: error: overloaded method value -%> with
> alternatives ((scala.xml.NodeSeq) =>
> scala.xml.Elem)net.liftweb.util.Helpers.FuncBindParam <and>
> (Option[scala.xml.Elem])net.liftweb.util.Helpers.FuncBindParam <and>
> (net.liftweb.common.Box[scala.xml.Elem])net.liftweb.util.Helpers.FuncBindPa
> ram
> <and> (scala.xml.Elem)net.liftweb.util.Helpers.FuncBindParam cannot be
> applied to ((scala.xml.NodeSeq) => scala.xml.NodeSeq)
> "searchBox" -%> doSearch _
> ^
> one error found
Why your doSearch function takes a msg parameter? ... it doesn't seam
to use it.
doSearch _ is a partially applied function and acts as a (NodeSeq) =>
NodeSeq however -%> has only a definition like:
def -%>(in: NodeSeq => Elem)
while -> also has
def ->(in: NodeSeq => NodeSeq)
which is why you get the compile error. We should add the same
definition for NodeSeq => NodeSeq
You can simply say:
"searchBox" -%> doSearch
and have def doSearch: NodeSeq = ...
FocusOnLoad returns a NodeSeq because it returns a sequence of nodes
which conceptually cannot be converted to an elem. You could try to
have a Group(FocusOnLoad ...) ... but Group is a Node not an Elem.
>
> Between all the bind() and ->()/-%>() overloads and my general Scala /
> Lift ignorance, I can't understand what the right way to resolve this
> is. I think it has something to do with FocusOnLoad returning a
> NodeSeq (<input/><script/>) vs. an Element, but I don't know where to
> go from here...
>
> Thanks in advance,
> - Luke
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