String Format
Please allow "masks" to be applied to textboxes and other controls, so when a user is entering a value it can be displayed in formats such as currency, or comma separated values. Be sure to implement this as a mask so that what is displayed is different than the actual stored value. This will make it much easier for users entering large numbers. I've had this requested by some customers already.
PS: Calculated fields are nice for display, but not when entering text.

String format and masks have been included into Universal Forms. You can define your own custom mask into the text box and will be including currency control into Universal Forms in the future.
Once we ship Universal Forms for SharePoint, I will update this feature.
Cheers,
Euan
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Susan Sch. commented
Ohter widely used masks are IBAN / BIC-(SWIFT-)Code, Credit/Debit Card Number
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Susan Sch. commented
For example, a widely used field on our forms is "cost location" (some sort of accounting number) that needs to be numerical, 7 digits, no decimals, no delimiters, with leading zeroes.
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Stephen Whitehead commented
It would be useful for an account code as well e.g. 1-0123-123456
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Ben commented
Type a number like 100 millions (100000000) and you'll see rapidly why we need real time masking with commas visible while a user type
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Anonymous commented
We'd like to have a mask for a Phone Number, like: (xxx) xxx-xxxx
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Bernard Hatch commented
+1 please
Example = Entering any dollar amount into a form.
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CGB commented
This would be very useful when entering a telephone number.