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New Feature
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Resolution: Obsolete
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Neutral
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None
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5.2
It would be nice to have an instant (i.e. before form submission) validation possibility of some fields in forms, e.g. when adding new user/group, then user should get a warning that the desired user/group name already exists before (s)he clicks the "Save" button.
There are some constraints from the UX point of view (from my discussion with Andreas):
In general, the following things are important when we do validation before form submission:
1. only do that on complex fields (e.g. a date or a credit card number)
2. or on fields where you need to comply with a set of rules (username is a good example, as it might still be free or not)
3. Do NOT show an error or problem, if the field is still empty. Only start doing so, once the user starts filling in a value in the field.
