问题
What is the syntax for calling list.size() in a JSF 2.0 Facelets template (eg, using an h:outputText element)?
回答1:
How about this:
<h:outputText value="#{fn:length(someBean.someList)}" />
You'll need to reference the functions taglib in your JSF page (URI: http://java.sun.com/jsp/jstl/functions).
回答2:
Just try #{myBean.myList.size()}
回答3:
It's not a problem with JSF 2.0 exactly. The JSF spec still requires a class that conforms to the bean spec. The collection classes don't do that with the .size() method. It would still have to be .getSize().
Given the need for a "standard" way to access the class values, we're not getting around that in JSF any time soon. Somebody needs to fix the collection classes.
回答4:
Note: The exact namespace for "fn" is added like this:
<html xmlns="http://www.w3.org/1999/xhtml"
...
xmlns:fn="http://java.sun.com/jsp/jstl/functions">
来源：https://stackoverflow.com/questions/1332169/how-do-you-call-list-size-from-a-jsf-2-0-facelets-template