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Hello! Flex 4 by Peter Armstrong

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Chapter 6. Building user-friendly forms using Flex formatters and validators

In this chapter, you’ll learn how to use the formatters and validators that make building data entry forms in Flex such a pleasure—well, at least compared to everywhere else. Flex formatters are used primarily to format data that’s being displayed to the user in controls like the DataGrid you saw in chapter 5. Flex formatters can also be used to take user input and turn it into correctly formatted input. Flex validators are used to validate user input and display validation messages when the user input isn’t correct.

The API documentation for formatters and validators is excellent in many regards; however, one area it has always been lousy at is showing how to use ...

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