Introducing Formatters and Validators

Flex formatters convert raw data into a customized string using predefined rules. The formatters can be used in MXML or in ActionScript and work well with data binding to simplify the display of formatted data.

Validators are used to ensure that data meets specific criteria before the application attempts to use it. This can be particularly important if you expect a user to input a number for a mathematical operation or a date for scheduling. Like formatters, validators can be used in MXML or ActionScript. They provide logical feedback on data input (valid or invalid) but also provide visual feedback in the way of red borders and error messages when input is invalid.