Can I really not get the size of a list in JSF?!

[robjellinghaus]

So I'm mucking with the noejb example (which is basically the booking application). I've changed it from a list of hotels to a list of blog posts (yes, another blogging system, just what the world needs, I know, I know). And I tried to make this change to pages.xml:

<page view-id="/main.xhtml" timeout="300000">View #{blogPosts.size} posts</page>

Blew up with a "no property 'size' on ListDataModel". Sure enough, there isn't. But there's getWrappedData(). So fine, I try:

<page view-id="/main.xhtml" timeout="300000">View #{blogPosts.wrappedData.size} posts</page>

Now I get "no property 'size' on java.util.ArrayList"! Feh, sure, it's List.size() not List.getSize(), right? Well, what's the workaround? I try

<page view-id="/main.xhtml" timeout="300000">View #{blogPosts.wrappedData['size']} posts</page>

Same error. Surf some *more*, and find this page which says it can't be done at all!!! http://www.crazysquirrel.com/computing/java/jsf/list-size.jspx

Well, the page does suggest adding getSize() on the wrapper object if any. So that brings me to the point here, which is why I'm posting here and not a JSF forum:

Can I submit a JIRA patch to add an org.jboss.seam.jsf.ListDataModel.getSize() method, which does the obvious thing? Then at least Seam apps would be able to get the freakin' size of a simple list via JSF EL :-)

(Also is there anywhere that documents how to generate a patch that Gavin will accept, with a Windows machine?)

Cheers!
Rob

[robjellinghaus]

I went ahead and added ListDataModel.getSize() and it works like a champ:

public int getSize ()
 {
 return ((List)getWrappedData()).size();
 }

Now I can do #{blogPosts.size} as I originally wanted.

How about it, Gavin? Post-beta-2 is fine with me, I'm not putting this thing into production aaaaanytime soon (it's my personal project, which means it's moving slowly)....

Cheers!
Rob

[gavin.king]

Use: #{blogPosts.rowCount}

[robjellinghaus]

:-P

Should have seen that one myself. Oh well, at least it was educational....

[vqminh]

what if I cannot outject it as datamodel, for example, I want to get the size of the List?

Thanks

[vqminh]

I mean the List of SelectItems

[cptnkirk]

If you're using Facelets, it's pretty easy to write an EL function to do this.

#{fn:sizeOf(myCollection)}

https://facelets.dev.java.net/nonav/docs/dev/docbook.html#taglib-create-function

https://facelets.dev.java.net/nonav/docs/dev/docbook.html#taglib-function