HideIfNoKids example?

[Michael Strecke]

Hi,

can anyone point me to an example showing the use of "HideIfNoKids"?

I'm trying to make a "top menu entry" disappear if the sub menus are not
reachable (via If or Hidden). I'm guessing this is, what that option
intends to do.

A Google search of the web only points to the API entry.
A search of this newsgroup came up empty.
The various books mention its existence, but nothing more.

I've set up a simple nested menu - using Lift 2.0 - like this:

val testSub1 = Menu(
Loc(
"testsub1",
new Link( List("testpath","suba"), false),
"- sub1")
)

val testSub2 = Menu(
Loc(
"testsub2",
new Link( List("testpath","subb"), false),
"- sub2")
)

val testTopMenu = Menu(
Loc(
"testTop",
new Link( List("testpath"), false),
"Test ..."),
testSub1,
testSub2
)

which works as expected:

The top entry "Test..." loads testpath.html and reveals two sub entries
"- sub1" and "- sub" when clicked upon.

If I hide the two sub menus (via Hidden) or make them not accessible
(using If() ), the "Test..." menu entry still remains.

If I use

val testTopMenu = Menu(
Loc(
"testTop",
new Link( List("testpath"), false),
"Test ...", HideIfNoKids),
testSub1,
testSub2
)

the menu entry disappears even if sub1 and sub2 available.

What did I miss?

Thank you

Michael

[Derek Chen-Becker]

I think that your interpretation is the intent, so it sounds like a bug. I did some work a month or two ago on the Menu.builder snippet, so it's possible that I broke something when refactoring. Let me look at the code again.

Derek

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[Derek Chen-Becker]

OK, I tried this out on my local test app and I can't reproduce the bug that you're seeing, but I *am* seeing some other strangeness with HideIfNoKids.

http://www.assembla.com/spaces/liftweb/tickets/832-fix-hideifnokids-so-that-it-works

Derek

On Fri, Jan 7, 2011 at 4:20 PM, Michael Strecke <michael...@googlemail.com> wrote:

[Naruki Ikeda]

Hi,

I tried in Lift 2.5.1 above example,

    val testSub1 = Menu(

      Loc(

        "testsub1",

        new Link( List("testpath","suba"), false),

        "- sub1")

    )

    val testSub2 = Menu(

      Loc(

        "testsub2",

        new Link( List("testpath","subb"), false),

        "- sub2")

    )

    val testTopMenu = Menu(

      Loc(

        "testTop",

        new Link( List("testpath"), false),

        "Test ...",HideIfNoKids),

      testSub1,

      testSub2

    )

But the this menu entry disappears.

If I don't use "HideIfNoKids",it appears in the menu.

I want to know how to use "HideIfNoKids" with child menu in Lift 2.5.1.

Thank You.

Naruki

[Richard Dallaway]

Hello Naruki

Not everyone will be able to easily see the original messages you've replied to (from 2011).  You might want to re-state what you want to achieve.

In case it helps you move forward, here's an example of HideIfNoKids:

val HasAccount = If(
      () => S.param("showit").isDefined,
      "Get an account!" )

...and a menu of...

 Menu.i("Usually Hidden") / "hide-example" >> HideIfNoKids submenus (
    Menu("Account") / "account" >> HasAccount
  )

If you visit /hide-example the "Usually Hidden" menu will be missing; if you visit /hide-example?showit, you'll see the "Usually Hidden" menu and the sub menu.

Richard

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