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can I do something like this with nested snippets?

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george-159

can I do something like this with nested snippets?

<lift:Licenses.index>

<h3><l:type /></h3>

<table>
<lift:Ratings.index>
<tr>
<td><r:rating /></td>
</tr>
</lift:Ratings.index>
</table>

</lift:Licenses.index>

and if so..

can I pass a parameter to the inner Ratings.index snippet - e.g the ID
of the current license object being processed - so that the
Ratings.index function can use it to find the ratings.

the idea being that this way I could re-use my existing Rating snippet
code to display ratings on the same page as licenses. or is this just
a bad idea?
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Naftoli Gugenheim

Re: can I do something like this with nested snippets?

Try (not sure if this is the correct syntax for snippet attributes):
<lift:Licenses.index>

<h3><l:type /></h3>

<table>
<lift:Ratings.index lift:Licenses.id="">
<tr>
<td><r:rating /></td>
</tr>
</lift:Ratings.index>
</table>

</lift:Licenses.index>

Then you need an attribute snippet Licenses.id which generates MetaData (xml attributes), and then Ratings.index needs to call S.attr to read the attribute.
I haven't tried doing this but this is my understanding.

On Tue, Aug 25, 2009 at 4:21 PM, george <[hidden email]> wrote:

<lift:Licenses.index>

<h3><l:type /></h3>

<table>
<lift:Ratings.index>
<tr>
<td><r:rating /></td>
</tr>
</lift:Ratings.index>
</table>

</lift:Licenses.index>

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george-159

Re: can I do something like this with nested snippets?

That seems to make sense mostly. I'll give it a try.

One thing I am not sure about is this:

As the License.index is iterating over the licenses, when I call
License.id how will the License snippet know which is the current
object? Do I have to maintain a reference to it somewhere?

Thanks
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Naftoli Gugenheim

Re: can I do something like this with nested snippets?

Yes, either in a RequestVar or make License a StatefulSnippet and use a regular class var.

On Tue, Aug 25, 2009 at 4:43 PM, george <[hidden email]> wrote:

That seems to make sense mostly. I'll give it a try.

One thing I am not sure about is this:

As the License.index is iterating over the licenses, when I call
License.id how will the License snippet know which is the current
object? Do I have to maintain a reference to it somewhere?

Thanks

dpp

Re: can I do something like this with nested snippets?

In reply to this post by george-159

On Tue, Aug 25, 2009 at 1:21 PM, george <[hidden email]> wrote:

<lift:Licenses.index>

<h3><l:type /></h3>

<table>
<lift:Ratings.index>
<tr>
<td><r:rating /></td>
</tr>
</lift:Ratings.index>
</table>

</lift:Licenses.index>

and if so..

can I pass a parameter to the inner Ratings.index snippet - e.g the ID
of the current license object being processed - so that the
Ratings.index function can use it to find the ratings.

the idea being that this way I could re-use my existing Rating snippet
code to display ratings on the same page as licenses. or is this just
a bad idea?

Lift snippets are evaluated lazily. What this means is that you'll get

Passed to the Licenses.index snippet. Your snippet may choose to return the xhtml bound or it may choose to evaluate the inner part as well:

object CurrentLicense extends scala.util.DynamicVariable[Box[License]](Empty)

class Licenses {
def index(xhmtl: NodeSeq): NodeSeq = {
   val currentLicense = calcLicense
   for {
     session <- S.session.toList
     val bound = bind("l", xhtml, "type" -> currentLicense.theType)
     node <- CurrentLicense.withValue(Full(currentLicense)){session.processSurroundAndInclude(PageName get, bound)}
   } yield node
}
}

In the Ratings snippet, you just have to get the current license from the CurrentLicense DynamicVariable.

--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
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george-159

Re: can I do something like this with nested snippets?

David - thanks for this.

I understand most of what is going on here.

I've not come across DynamicVariable before, but having looked it up I
think I see why you have used it.

Please could you explain a bit more what is happening in this line:

CurrentLicense.withValue(Full(currentLicense))
{session.processSurroundAndInclude(PageName get, bound)}

What/where is PageName get ?

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dpp

Re: can I do something like this with nested snippets?

On Tue, Aug 25, 2009 at 3:09 PM, george <[hidden email]> wrote:

David - thanks for this.

I understand most of what is going on here.

I've not come across DynamicVariable before, but having looked it up I
think I see why you have used it.

Please could you explain a bit more what is happening in this line:

CurrentLicense.withValue(Full(currentLicense))
{session.processSurroundAndInclude(PageName get, bound)}

What/where is PageName get ?

It's a RequestVar in LiftSession.scala