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4

In many UIs, you can input a number directly in a spin box without using the arrows. Taking this fact into account, I think that you should use a spin box only when it makes sense for the user to change the value using the arrows instead of inputing directly a new value. In my opinion, using the arrows makes sense only when you need to increment/decrement a ...


3

Use spin boxes when the value being entered is a numerical value within a range, and don't use them when the number instead represents an identity (e.g. port number). Especially consider using spin boxes if the value is a numerical value where you want to encourage particular increments (e.g. thousands)


1

Actually the accepted answer does not show one main reason why it has been made this way. More than visual perception, putting a fixed bar at the bottom of a modal popup which has actions (like "OK" button in your examples) will let the user see the possible actions even if the content section is too big to fit in a small screen -->There is a scrollbar. ...



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