wtform selectfield 验证不要选择列表中的第一个

Question

I've got two selectfield that the user should select an airport from a list, however I want the first option will be "make your choice" or something like that, and the user won't be able to choose (like a default choose)

AIR_PORTS_LIST = [(0, 'Make Your Choice'), (1, 'praia'), (2, 'abidjan')]

class LoginForm(FlaskForm):
    airport_src = SelectField('AirPort Source', choices=AIR_PORTS_LIST, validators=[DataRequired()])
    airport_dst = SelectField('AirPort Destination', choices=AIR_PORTS_LIST, validators=[DataRequired()])

Answer 1

It is known as Placeholder and yes you can write in html like this:

{{ form.airport_src(placeholder='Make Your Choice') }}
{{ form.airport_dst(placeholder='Make Your Choice') }}

There is no need to write it in choices.