ADF EL: check if an item is contained in a list

Question

I'm using JDeveloper 11.1.1.7.0

In the backing bean, I have a List attribute called myList, with related public and standard getter and setter methods, and I need to check if a String is contained inside it, in the context of an EL expression.

I have tried this expression:

disabled="#{myBean.myList.contains(label)}"

But it fails, and the message is that character ( has found instead of [ , . , or, eq, ...

I have tried to generate my custom TLD following this clear and well-explained steps How to create a custom EL function?, but I got an error becaus the function I declare is not found.

How can I check this condition (String contained in a List) in an EL expression? Thanks in advance. Regards

Answer 1

An EL Expression can't pass parameters when invoking a function, but I found this link which explain an idea to simulate a passing-parameters by using a Map. It works perfect for me: Pass parameters from EL to a method: Simulation

Answer 2

Did you try this:

disabled="#{empty myBean.myList[label]}"

Answer 3

If you really have an attribute of type List in your backing bean this should work.

You can also use it in the following ways:

disabled="#{myBean.myList.contains('the text')}"

disabled="#{not myBean.myList.contains(label)}" // contains not

disabled="#{myBean.myList.contains(label) eq true}"

disabled="#{!myBean.myList.contains(label)}" // contains not

If this doesn't work maybe something is wrong with your list.

See also:

• How to check a boolean condition in EL?
• String contains method in jsf
• Collection/Array contains method