将 Select2 与烧瓶 wtforms 一起使用答案

【问题标题】：Using Select2 with flask-wtforms将 Select2 与烧瓶 wtforms 一起使用
【发布时间】：2019-01-01 08:22:22
【问题描述】：

在 select2 操作下拉字段后，form.owner_id.data 的常规使用会产生 None。如何从 select2 字段中提取所选选项。

如果我禁用 select2 javascript，wtforms 将正常工作，我将能够使用form.owner_id.data。（但看起来很丑）

forms.py

class ProjectForm(FlaskForm):
    owner_id = SelectField('Owner:', [validators.Required()], choices=[], render_kw={"placeholder": "Owner company *"})

（为简单起见，表格的其余部分已被截断）

views.py

@app.route('/new_project/<int:company_id>', methods=('GET', 'POST'))
def new_project(company_id):
    membership = Membership.query.filter_by(user_id=current_user.id, company_id=company_id).first()
    company = Company.query.filter_by(id=company_id).first_or_404() 
    form = ProjectForm()

    form.owner_id.choices = [(str(comp.id), repr(comp)) for comp in Company.query.all()]

    form.client_id.choices = [(str(comp.id), repr(comp)) for comp in Company.query.all()]

    form.contractor_id.choices = [(str(comp.id), repr(comp)) for comp in Company.query.all()]

    form.membership_id.choices = [(str(comp.id), repr(comp)) for comp in Company.query.all()]

    if request.method == 'POST':
        flash(str(form.owner_id.data), 'success')

    if form.validate_on_submit():
        project = Project()
        connection = Assignment()

        # PROJECT DETAILS
        project.title = form.title.data
        project.description = form.description.data
        project.owner_id = int(form.owner_id.data)

_宏

{% macro render_select_field(field, placeholder='Select...', label='Select an option below') %}
<div class="form-group">
    <label>{{ label }}</label>
    <select data-placeholder="{{ placeholder }}" class="select-size-xs">
        <option></option>
          {% for choice in field.choices %}
              <option value="{{ choice[0] }}">{{ choice[1] }}</option>
            {% endfor %}
    </select>
    {% if field.errors %}
    {% for error in field.errors %}
      <span class="help-block text-danger"><i class="icon-cancel-circle2 position-left"></i>{{ error }}</span>
    {% endfor %}
  {% endif %}
</div>
{% endmacro %}

html

<form method="POST" action="{{ url_for('new_project', company_id=company.id) }}" enctype="multipart/form-data" role="form">
            <div class="panel panel-body login-form">
                <div class="text-center">
                    <div class="icon-object text-muted"><i class="icon-plus2"></i></div>
                </div>

                {{ form.hidden_tag() }}
                <div class="text-center form-group"><span>Project details</span></div>
                {{ new_render_field(form.title, icon="icon-quill2", class_='form-control') }}

                {{ new_render_field(form.description, icon="icon-stack-text", class_='form-control', rows=10) }}

                {{ render_select_field(form.owner_id, placeholder="Who's doing the work?", label="Select the owner company") }}

                {{ render_select_field(form.client_id, placeholder="Where do the bills go?", label="Select the client company") }}

                {{ new_render_field(form.default_client_rate, icon="icon-price-tag", class_='form-control') }}

                {{ new_render_field(form.default_contractor_rate, icon="icon-price-tag", class_='form-control') }}


                <!-- THE REST OF FORM HAS BEEN TRUNCATED FOR SIMPLICITY -->
                <div class="form-group">
                  <button type="submit" class="btn bg-pink-400 btn-block">Create</button>
                </div>
            </div>
        </form>

【问题讨论】：

在 Select2 操作 DOM 之后，您原来的 <option>s 仍然存在，隐藏在所有新代码之下。也许您可以在提交按钮中添加一些 JS，将旧选项标记为 selected="selected"
我尝试过：var selected = $('#select2-1mme-container').text() $('option:contains(selected)').setAttribute('selected', 'selected');。但是option:contains(selected) 没有返回任何结果。还有其他想法吗？

标签： javascript python flask jquery-select2 wtforms

【解决方案1】：

因此，在分析了检查窗口中的选择字段后，很明显选择字段缺少 wtforms 验证表单所需的 name="{{ field.name }}"。在我的 _macro 中所做的简单更改来自于：

<select data-placeholder="{{ placeholder }}" class="select-size-xs">

对此：

<select data-placeholder="{{ placeholder }}" class="select-size-xs" name="{{ field.name }}">

有了这个添加，wtforms 现在可以验证，并找到返回正确 id 的 form.owner_id.data 的选定选项。

【讨论】：