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Even though most of the literature and articles on validation is in the context of form input, I think that you can pretty much handle most of them in the same way on widgets. For example, here is an article from the NNg group withe some guidelines on How to Report Errors in Forms that applies some of the concepts that you have described. The example where ...


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I agree with Cristian. It would be better to show the input range of the text field at the beginning. Another way could be to specify the input range in the "Placeholder Text". Still, if the user enters invalid numbers, I would recommend highlighting the box with a red color. It's one of the Usability Heuristics to inform the user about the error clearly and ...


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I recommend either to show the allowed range for the input from the beginning or do real time validation. It is bad UX to verify inputs only after ok is being pressed. For the second part you can let the use input a value that is not widthin range like 1760 or even 17000 but mark the input red and disable the ok button. This is where the shown allowed ...


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