You can set the point at which
validation occurs—when the site visitor clicks outside the widget,
as the visitor types, or when the visitor tries to submit the form.
Select a Validation Text Field widget in the Document
window.
In the Property inspector (Window > Properties)
select the option that indicates when you want validation to occur.
You can select all of the options or none of them.
Blur
Validates whenever the user clicks outside the text field.
Change
Validates as the user changes text inside the text field.