WebTextField.LimitText
From Xojo Documentation
Property (As Integer )
aWebTextField.LimitText = newIntegerValue
or
IntegerValue = aWebTextField.LimitText
Supported for all project types and targets.
or
IntegerValue = aWebTextField.LimitText
Supported for all project types and targets.
The maximum number of characters allowed in the WebTextField.
The value of zero does not limit text.
Example
Only allow the user to type up to 140 characters:
Me.LimitText = 140