When to create and use custom convertors?
The main reasons behind creating our converter are :
1. When we want to convert a component's data to a type other than a standard type
When we want to convert the format of the data. Read more at http://www.
JSF Interview Questions
When to create and use custom convertors? The main reasons behind creating our converter are :
When we want to convert a component's data to a type other than a standard type
What are the steps of creating and using custom converter in our
application? Creating and using a custom converter requires the following steps :
Steps to follow :
Create a class that implements javax.faces.converter.Converter
Import necessary packages and classes.
Implement two abstract methods "getAsObject()",
"getAsString()" provided by Converter
interface. getAsObject() method converts the String (User
Input) to Object and getAsString() method converts the Object
to String to send back to the page.
Register the converter class in configuration file (faces-config.xml) adding <converter>
element. This element has child elements <converter-id>(name of the converter to be used while programming )and <converter-class>( name of the converter class which we have created).
Create view page where <f:converter> tag is
used with attribute "converterId" which specifies
the name of the converter which we have specified in <converter-id>
element of <converter> element in "faces-config.xml"
What are the ways to register the custom converters in faces
context? After creating custom converter class implementing Converter
interface it needs to register in the faces context. This can be done in
one of the two ways :
Register the converter class with the id. This id is used in
<f:convertrer> tag in our view page (For example, JSP).