How to put EL into setRendered()?

[Sasha Baker]

I need to set visibility of an UIInput component programmatical and with a binding:

<h:inputText rendered="#{mybean.visisble}" />

uiInput.setRendered(boolean); doesn't do the job.

Instead I tried:

FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
ValueExpression valueEx = app.getExpressionFactory().createValueExpression(context.getELContext(), "#{mybean.visisble}", Boolean.class);
uiInput.setValueExpression("rendered", valueEx);

It doesn't work.

[Marius Snyman]

 

Originally posted by Sasha Baker:
I need to set visibility of an UIInput component programmatical and with a binding:

<h:inputText rendered="#{mybean.visisble}" />

uiInput.setRendered(boolean); doesn't do the job.

Instead I tried:

FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
ValueExpression valueEx = app.getExpressionFactory().createValueExpression(context.getELContext(), "#{mybean.visisble}", Boolean.class);
uiInput.setValueExpression("rendered", valueEx);

It doesn't work.

I suggest that instead of doing:
rendered="#{mybean.visisble}"
do:
binding = "{BB.inputText}"


Then in the backing bean on some condition activate the inputText
example:
BB:
HtmlInputText inputText = new HtmlInputText();

constructor(){
inputText.setRendered(false);
}
public void someMethod(){
inputText.setRendered(false);
}

If you look at the JSF documentation you will see that when the object property is changed JSF will re-render the object. The way you have done it the re-render will not occur. Hope this helps.

[Sasha Baker]

Thank you for your help!

I was trying to build something like this from java code:

<a4j:region>
<h:selectBooleanCheckbox id="nameCheckable" value="#{bean.visible}">
<a4j:support reRender="nameAjaxPanel" event="onclick"/>
</h:selectBooleanCheckbox>
<a4j:outputPanel id="nameAjaxPanel" >
<h:inputText id="name" rendered="#{bean.visible}"/>
</a4j:outputPanel>
</a4j:region>

The ValueExpression as described above works well. My fault was to use
.setValue("#{bean.visible}");, which neither works nor results in an error message, as setValue expects a plain Object. But the String isn't parsed
as an expression value. Instead one must call .setValueExpression("value", vExp) too.

To give a more complete source example for the use of ValueExpression:

HtmlInputText inputText = new HtmlInputText();
HtmlSelectBooleanCheckbox box = new HtmlSelectBooleanCheckbox();
// jsf code generation ...
FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
ValueExpression valueEx = app.getExpressionFactory().createValueExpression(context.getELContext(), "#{bean.visible}", Boolean.class);
inputText.setValueExpression("rendered", valueEx); // <h:inputText rendered="#{bean.visible}" />
box.setValueExpression("value", valueEx); // <h:selectBooleanCheckbox value="#{bean.visible}" />

[ November 27, 2008: Message edited by: Sasha Baker ]