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What's the canonical way to validate the contents of a TextField as the user types? For example in one field I want the user to be allowed to enter integer values from 0 to 99. In another text field only valid decimal values from -10.0 to +10.0. So I want to prevent the user from entering invalid characters, and also in the correct ranges.
I'm not sure there's anything "canonical" yet and, since there's no built-in support for filtering like that, your only option appears to be hooking into onTextChanging and attempting to modify the field on-the-fly (or possibly the event can be cancelled when appropriate?).
I had tried validating the text using onTextChanging, but what I see happening is when the user enters an invalids character it temporarily appears on screen before I remover it which is undesired. Any way to hook in earlier Like on key press?
