Flask WTForm:根据之前的输入添加新字段

from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired

class MyForm(FlaskForm):
    previous_input = StringField('Previous Input', validators=[DataRequired()])
    new_field = StringField('New Field', validators=[DataRequired()])
    submit = SubmitField('Submit')

@app.route('/add_field', methods=['GET', 'POST'])
def add_field():
    form = MyForm()
    if form.validate_on_submit():
        previous_input = form.previous_input.data
        new_field = form.new_field.data
        # 在这里根据之前的输入添加新字段的逻辑处理
        return 'New field added successfully!'
    return render_template('add_field.html', form=form)

<form method="POST" action="{{ url_for('add_field') }}">
    {{ form.hidden_tag() }}
    <div class="form-group">
        {{ form.previous_input.label }} {{ form.previous_input(size=20) }}
    </div>
    <div class="form-group">
        {{ form.new_field.label }} {{ form.new_field(size=20) }}
    </div>
    <div class="form-group">
        {{ form.submit() }}
    </div>
</form>