i want to show some data to the user
the data maybe represented to user by different JSF tags based on a configuration
for example some times it may represented by text
and sometimes it may represented by graphical symbol or even chart
also i want that this representation be customizable.
how could i do this?
Make use of the rendered attribute.
<h:outputText value="#{bean.value}" rendered="#{bean.datatype == 'text'}" />
<h:graphicImage value="#{bean.value}" rendered="#{bean.datatype == 'image'}" />
<x:someChart value="#{bean.value}" rendered="#{bean.datatype == 'chart'}" />
Whenever the boolean expression in the rendered attribute evaluates to true, the component will be rendered (displayed), otherwise not (hidden). In the above example the Bean#getDataType() should return a String or an Enum.
Here are another examples of how to use boolean expressions in EL:
<h:someComponent rendered="#{bean.booleanValue}" />
<h:someComponent rendered="#{bean.intValue > 10}" />
<h:someComponent rendered="#{bean.objectValue == null}" />
<h:someComponent rendered="#{bean.stringValue != 'someValue'}" />
<h:someComponent rendered="#{!empty bean.collectionValue}" />
<h:someComponent rendered="#{!bean.booleanValue && bean.intValue != 0}" />
<h:someComponent rendered="#{bean.enumValue == 'FOO' || bean.enumValue == 'BAR'}" />
