Focus Lost Event

An event of “Focus Lost” would be exceptionally useful. Many times other field values need to be re-calculated after the user enters information or some kind of validation needs to occur (possibly with a pop-up letting the user know that they need to change their input). Without a “Focus Lost” event, simulating this type of interaction is very difficult, if not impossible.

Some simple examples:

Calculated Label:

Text field A

Text field B

Label C

The user enters A and B. C populates with A – B. If the user changes A or B, C needs to change as well.

Validation:

Text field “Company”

The user types in a company name. Validation occurs when focus is lost, which shows a pop-up letting the user know that the company already exists.