JSF PrimeFaces rendering components - jsf

Question

Let's say I have a simple method that, like this:
public String test()
{
return "hello";
}
Now let's say I have the following PrimeFace component:
<p:fieldset styleClass="containers" rendered="#{controller.test()}">
<h2>Testing</h2>
<p:outputLabel for="test" value="Test" />
<p:inputText id="test" />
</p:fieldset>
The method above returns "hello". I would like to dynamically show and hide that fieldSet by comparing the returned value of that method to a field of one of my beans. For instance, on the rendered parameter, I would like to do something like: controller.test() != "some variable" which would return true or false. Am I allow to do that? If not, what is the way of doing it?
Basically the goal is to dynamically show and hide some container by comparing the returned value of a method with a bean property.

Answer 1

Look Like you misunderstood rendered
The rendered Attribute
A component tag uses a Boolean EL expression, along with the rendered
attribute, to determine whether or not the component will be rendered.
If you will check above definition you will know what exactly is the use of this attribute.
More you can see below
The rendered attribute which uses Boolean EL expression indicates
whether a component is currently visible or not. The property is
useful when you want to hide components for specific users or based on
condition. The default value of rendered attribute is true.
<h:outputText value=”mapping” rendered=”Boolean EL expression” />
For example, the commandLink component in the following section of a page is not rendered if the cart contains no items:
<h:commandLink id="check"
...
rendered="#{cart.numberOfItems > 0}">
<h:outputText
value="#{bundle.CartCheck}"/>
</h:commandLink>
With your concrete problem you can do like this
Make a String variable call value
Now create get/set methods for above variable
Now in your test method you can add
public void test(){
value="hello";
}
Bur remember you have call test() method of page load
Now in your Xhtml or Jsf or Jsp page
rendered="#{controller.value != 'hello'}"
Or better way create a Boolean variable and do all the magic of hide and show the component