Is it possible to filter in real time the data entry of a numerical
value in an input field by limiting the data entry between a min
and a max value ?
In Interface Builder, I can define a formatter by fixing a minimum
and a maximum value but the checking is made only after the
validation of the data entry (by carriage return for example).
I don't want this but I want a filtering in real time during the
data entry.
How can I do that ?
Thank you
In general, if you could, it would result in a hideous UI.
If your min was 10 and a max of 100, with a current value of 50, how
would they change this to 90? The most logical way would be to
select the value and start typing - the problem is that they type a 9
and suddenly the value is 9, which is less than the minimum, so
either an error appears or it somehow prevents this. Instead, the
only way would be to select the "5" only and then type a "9", which
isn't the most pleasant experience.
Now what if they wanted 92? They had to first select the "5", type a
"9", select the "0", type a "2". They now wanted 93 - the most
logical thing would be to backspace over the 2 and type a 3, but they
can't do this because it changes it to 9 which is less than the min.
Worse, consider a range of 5 to 15, with a current value of 8. There
is no easy way for them to type 10 - they can't add the 1 in front of
the thing (since 18 is too large) and they can't select the 8 and
replace it with a 1 (since that is too small). They would have to
select the 8, type a 5, move the cursor left, add a 1 in front of it,
and then go and change the 5 to 0. And if the range were 5..14,
there is no way at all...
If you need the user to enter a value between two (relatively close)
values, perhaps a slider would be a better approach?
Glenn Andreas email@hidden
<http://www.gandreas.com/> wicked fun!
quadrium2 | build, mutate, evolve, animate | images, textures,
fractals, art
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