Reuse a facelet in multiple beans
- by Seitaridis
How do I invoke/access a property of a managed bean when the bean name is known, but is not yet constructed?
For example:
<p:selectOneMenu value="#{eval.evaluateAsBean(bean).text}" >
<f:selectItems value="#{eval.evaluateAsBean(bean).values}" var="val"
itemLabel="#{val}" itemValue="#{val}" />
</p:selectOneMenu>
If there is a managed bean called testBean and in my view bean has the "testBean"value, I want the text or values property of testBean to be called.
EDIT1
The context
An object consists of a list of properties(values). One property is modified with a custom JSF editor, depending on its type.
The list of editors is determined from the object's type, and displayed in a form using custom:include tags. This custom tag is used to dynamically include the editors <custom:include src="#{editor.component}">. The component property points to the location of the JSF editor.
In my example some editors(rendered as select boxes) will use the same facelet(dynamicDropdown.xhtml). Every editor has a session scoped managed bean. I want to reuse the same facelet with multiple beans and to pass the name of the bean to dynamicDropdown.xhtml using the bean param.
genericAccount.xhtml
<p:dataTable value="#{group.editors}" var="editor">
<p:column headerText="Key">
<h:outputText value="#{editor.name}" />
</p:column>
<p:column headerText="Value">
<h:panelGroup rendered="#{not editor.href}">
<h:outputText value="#{editor.component}" escape="false" />
</h:panelGroup>
<h:panelGroup rendered="#{editor.href}">
<custom:include src="#{editor.component}">
<ui:param name="enabled" value="#{editor.enabled}"/>
<ui:param name="bean" value="#{editor.bean}"/>
<custom:include>
</h:panelGroup>
</p:column>
</p:dataTable>
#{editor.component} refers to a dynamicDropdown.xhtml file.
dynamicDropdown.xhtml
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.prime.com.tr/ui">
<p:selectOneMenu value="#{eval.evaluateAsBean(bean).text}" >
<f:selectItems value="#{eval.evaluateAsBean(bean).values}" var="val"
itemLabel="#{val}" itemValue="#{val}" />
</p:selectOneMenu>
</ui:composition>
eval is a managed bean:
@ManagedBean(name = "eval")
@ApplicationScoped
public class ELEvaluator {
...
public Object evaluateAsBean(String el) {
FacesContext context = FacesContext.getCurrentInstance();
Object bean = context.getELContext()
.getELResolver().getValue(context.getELContext(), null, el);
return bean;
}
...
}
