Time for action – creating warning and error messages
In free-form text fields, it's sometimes possible to enter a value that isn't valid. For example, when asking for an e-mail address, it might be necessary to validate it against some kind of regular expression such as .+@.+
to provide a simple check.
- To test the default validation, run the target Eclipse instance and go to the Clock preference page. Type some text in the numeric field. A warning message, Value must be an integer, will be displayed:
- To add validation, create a new field called
offset
that allows values between-14
and+12
(by default,IntegerFieldEditor
validates against the0..MAX_INT ...
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