QPhoneTextBox: Formatting and Validation of Phone Numbers

QPhoneTextBox is a simple extension of the QTextBox control that allows you to easily validate and format the phone numbers that users provide. That format is (xxx) xxx-xxxx. Validation and re-formatting happen when the user tabs out or somehow else leaves the QPhoneTextBox, giving focus to another control.

If the user enters something different - for example, a phone number without spaces like 1112223344, it will be reformatted to (111) 222-3344. Same with inputs like 111-222-3344, etc.

QPhoneTextBox allows you to specify an optional default area code - in those cases when you can predict what the user's area code most likely is. In the example below, we're using 650 as the default area code. That said, the user can freely delete that default and put in any area code they want.

Note that the control currently supports only North American phone formats - it can be easily extended to support other formats as well. If you do end up writing an extension of this control, please do share it with the QCubed community.