HTML and CSS Reference
In-Depth Information
<br/>
<h:commandButton action="#{testBean.proceed}" value="Proceed"/><br/>
<h:outputText value="#{testBean.location}">
<f:converter converterId="com.jsfprohtml5.LocationConverter" />
</h:outputText>
<h:messages style="color: red"/>
</h:form>
</h:body>
</html>
As shown in the bolded lines, in the converter test page, there is an input text and an output text which uses
LocationConverter
using
<f:converter>
tag.
<f:converter>
tag is a core tag that is mainly designed in order to
avoid creating a TLD (Tag Library Descriptor) for every custom converter. Passing the ID of the custom converter,
which is defined in the
@FacesConverter
annotation, to the
converterId
attribute of the
<f:converter>
tag will
attach the custom converter to the parent
ValueHolder
component.
Figure
3-2
shows a conversion error that will be displayed when the user enters invalid location information that
does not cope with the location (
Address, City, Country
) format.
Figure 3-2.
LocationConverter error message
Figure
3-3
shows the behavior of
LocationConverter
when the user inputs valid location information that copes
with the location (
Address, City, Country
) format.
Figure 3-3.
LocationConverter behavior for input and output text
Validation
In order to understand the JSF validation, we need to know four main topics: the
Validator
interface APIs, the
standard JSF Validators, how to build a custom validator in JSF, and finally how to work with Java Bean Validation
(JSR 303) APIs. The next subsections illustrate these topics in detail.
