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scalalift

select NodeSeq by it's id (IdSelector?)

How do I select a NodeSeq by it's id?

In lift, there are "CssSelectors" that allow you to do something like "#myId" #> function, and the function will receive only the desired NodeSeq as input.

But how do I use this fine "css selector" to select nodes, not only apply a function straight afterwards?

I know it can by done by searching all "id" attributes in NodeSeq, but isn't it more CPU-consuming than the Lift's version? Any thoughts or suggestions?

Solution

  • Use the ^^ selector (it ignores the right side of #>):

    scala> import net.liftweb.util.Helpers._
import net.liftweb.util.Helpers._

scala> "#id ^^" #> "" apply <test><el id="id"/></test>
res0: scala.xml.NodeSeq = NodeSeq(<el id="id"/>)

    As for performance, obviously Lift has to iterate over the id attributes itself.