JSF/IceFaces Conditional Rendering
I am using Icefaces to conditonally render a component but it cant pick up the boolean:
BeanCode:
public boolean isEmpty(){
return true;
}
public int getCount(){
if (isEmpty()){
return 0;
}
ret开发者_如何学Pythonurn 1;
}
IceFaces
<ice:panelGroup rendered="#{coverage.empty}"> //this doesnt work
<ice:panelGroup rendered="#{coverage.count==0}"> //this does work
Error message: Error Parsing: #{coverage.empty}
Why is IceFaces not recognising the boolean?
As you stated, empty
is a reserved word in Expression Language. It is indeed an operator.
It tests if an element is null
or empty (for example, if your element is a String
, it tests if his value is either null
or ""
).
You can find many example of EL here.
Turns out empty is a reserved word in faces.
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