from otree.api import *


class Fear(Page):
    form_model = 'player'
    form_fields = ['fear_level']

    def error_message(self, values):
        # 保险起见，后端也做一次必答校验
        if values.get('fear_level') is None:
            return 'Please select an option.'

    def before_next_page(self):
        self.participant.vars['fear_level'] = self.player.fear_level


page_sequence = [Fear]