在SelectField和HiddenField之间动态切换WTForms字段类型

from flask_wtf import FlaskForm
from wtforms import SelectField, HiddenField
from wtforms.validators import DataRequired

class DynamicForm(FlaskForm):
    field_type = HiddenField('Field Type')
    dynamic_field = SelectField('Dynamic Field', validators=[DataRequired()])

    def __init__(self, *args, **kwargs):
        super(DynamicForm, self).__init__(*args, **kwargs)
        if self.field_type.data == 'hidden':
            self.dynamic_field = HiddenField('Hidden Field')
        else:
            self.dynamic_field = SelectField('Select Field', choices=[('option1', 'Option 1'), ('option2', 'Option 2')])

# 示例使用
form = DynamicForm(field_type='select')
print(form.dynamic_field)  # 输出: <SelectField 'Dynamic Field'>
form = DynamicForm(field_type='hidden')
print(form.dynamic_field)  # 输出: <HiddenField 'Hidden Field'>