使用AJAX使用Flask-WTForms将条目追加到FieldList

Question

我使用Flask-WTForms在Flask中制作了一个简单的表单，父母可以在其中注册自己和他的孩子。父母可以通过单击“添加孩子”按钮来注册任意数量的孩子。WTForms通过使用FieldList功能使此操作非常容易实现。

但是，单击“添加子项”按钮后，页面会自动刷新，因为它向服务器发出了请求。我想使用AJAX请求添加子表单，因此页面不会刷新。

我知道如何执行AJAX请求，发送回响应并将此响应添加到html页面。但是，我不知道如何将条目追加到表单对象并返回页面本身（以某种方式）以及更新后的表单对象。那有可能吗？

我的表格：

class ChildForm(FlaskForm):

    name = StringField(label='Name child')
    age = IntegerField(label='Age child')

    class Meta:
        # No need for csrf token in this child form
        csrf = False

class ParentForm(FlaskForm):

    name = StringField(label='Name parent')
    children = FieldList(FormField(ChildForm), label='Children')
    add_child = SubmitField(label='Add child')

    submit = SubmitField()

我的路线：

@app.route('/register', methods=['GET', 'POST'])
def register():
    form = ParentForm()

    if form.add_child.data:
        form.children.append_entry()
        return render_template('register.html', form=form)

    if form.validate_on_submit():
        # do something with data

    return render_template('register.html', form=form)

register.html：

<form action="{{ url_for('register') }}" method="post" id="parentForm">
    {{ form.hidden_tag() }}
    {{ form.name.label }} {{ form.name }}

    {{ form.add_child }}

    {% for childform in form.children %}

        {% for field in childform %}
            {{ field.label }} {{ field }}   
        {% endfor %}

    {% endfor %}

    {{ form.submit }}
</form>

Answer 1

我认为这应该有效。除非有任何错别字。

视图.py

########
# SET UP YOUR FLASK APP HERE
########

from flask_wtf import FlaskForm
from wtforms_alchemy import model_form_factory

class Family(db.Model):
    id = db.Column('id', db.Integer, primary_key=True)
    name = db.Column(db.String(500), info={'label': 'Familyname', 'validators': DataRequired()})

class Member(db.Model):
    id = db.Column('id', db.Integer, primary_key=True)
    name = db.Column(db.String(500), info={'label': 'Member', 'validators': DataRequired()})


BaseModelForm = model_form_factory(FlaskForm)

class ModelForm(BaseModelForm):
    @classmethod
    def get_session(self):
        return db.session

class MemberForm(ModelForm):    

    class Meta:
        model = Machine


class MemberEditForm(MemberForm):
    pass

class MainForm(ModelForm):

    add_member = SubmitField('+ Member')
    members = ModelFieldList(FormField(MemberForm))
    class Meta:
        model = Family



@app.route('/form')
def main_form():

    family = Family()
    form = MainForm(obj=family)

    if form.add_member.data:
        getattr(form,'members').append_entry()
        return render_template('form.html', form=form)

    if form.validate_on_submit():
        form.populate_obj(family)
        db.session.add(order)
        db.session.commit()

    return render_template('form.html', form=form)


@app.route('/process_add_member', methods=['POST'])
def add_member():
    form = MainForm()

    getattr(form,'members').append_entry()

    return render_template('members.html', form=form)

表单.html

<script type="text/javascript">

    $("#add-member").on('click', function(event){
        $.ajax({
            url: "{{ url_for('add_member') }}",
            type : "POST",
            //dataType : 'json', // data type
            data : $("#main-form").serialize(),
            success : function(result) {
                console.log(result);
                $("#members").html(result);
            },
            error: function(xhr, resp, text) {
                console.log(xhr, resp, text);
            }
        });
        event.preventDefault();

        });
</script>


<form method="post" action="{{ url_for('main_form') }}" id="main-form">
{{ form.hidden_tag() }}
{{ form.name.label }} {{ form.name }}


<fieldset class="form-group border p-2">
    <span id="members">{% include 'members.html' %}</span>

    <div class="form-row">
        {{ form.add_member(id="add-member") }}
    </div>
</fieldset>

</form>

会员.html

<span class="h3">Members</span>
{% if form.members%}
    <div class="form-row">
        <div class="col-1 form-group">Name</div>
    </div>
{% endif %}

{% for member in form.members %}    
    <div class="form-row">
        {% for field in member %}
            <div class="col-1 form-group">{{ field(class="form-control") }}</div>
        {% endfor %}
    </div>
{% endfor %}