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Showing content from http://docs.oracle.com/javaee/6/tutorial/doc/gjcut.html below:

Using Converters, Listeners, and Validators

The previous chapter described components and explained how to add them to a web page. This chapter provides information on adding more functionality to the components through converters, listeners, and validators.

• Converters are used to convert data that is received from the input components.

• Listeners are used to listen to the events happening in the page and perform actions as defined.

• Validators are used to validate the data that is received from the input components.

The following topics are addressed here:

• Using the Standard Converters

• Registering Listeners on Components

• Using the Standard Validators

• Referencing a Managed Bean Method

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