How to testing for enum equality in JSF?

jsf enums el
DD. picture DD. · Mar 26, 2010 · Viewed 40.9k times · Source

Is it possible to test for enum equality in JSF?

E.g. where stuff is an enum Stuff:

<h:outputText value="text" rendered="#{mrBean.stuff == mrsBean.stuff}"/>

Answer

BalusC picture BalusC · Mar 26, 2010

This is actually more EL related than JSF related. The construct as you posted is valid, but you should keep in mind that enum values are in EL 2.1 are actually evaluated as String values. If String.valueOf(mrBean.getStuff()) equals String.valueOf(mrsBean.getStuff()), then your code example will render. In EL 2.2 the same construct will work, but they are evaluated as true enums.

Note that it indeed requires a getter method to return the enum value. Given the fact that enums are treated as String, you can in essence also just do:

<h:outputText value="text" rendered="#{mrBean.stuff == 'FOO'}" />

In current EL 2.2 version, you cannot access enum values directly like this:

<h:outputText value="text" rendered="#{mrBean.stuff == Stuff.FOO}" />

This is only possible when you use OmniFaces <o:importConstants>:

<o:importConstants type="com.example.Stuff" />
...
<h:outputText value="text" rendered="#{mrBean.stuff == Stuff.FOO}" />

Related questions

Passing a Enum value as a parameter from JSF

I am trying to migrate my existing code to using Enum and I run into some problems due to my lack experience with Enum. First of all here is my structures. In my EJB, alongs with Entity, I have a …

Read More
JSF 2: Using enums in the rendered attribute

Is there any way to check declaratively whether an enum has a specified value. For example: <h:graphicImage name="error.png" library="images" rendered="#{viewController.current.status == Status.ERROR}" /> It's a little bit tedious to define a method …

Read More
How to access enum properties in EL?

Given the following enum. public enum Constants { PAGE_LINKS(10); //Other constants as and when required. private final int value; private Constants(int value){ this.value = value; } public int getValue(){ value; } } This enum is placed under an application scoped bean like …

Read More