遍历嵌套的 FormField

Question

我正在尝试遍历 FormField 中的 FormField，它们都是 FieldList 的一部分。

在我的 views.py 中，我正在调用 mainForm，模板通过 FormField subForm 成功迭代。但是，当我无法通过 subSubForm 进行迭代时。这些字段永远不会出现在浏览器中。

表格代码：

class subSubForm(Form):
    step = IntegerField("step", validators=[NumberRange(min=0, max=99)])
    description = TextField("Description")
    information = TextAreaField("Information Exchanged")])

class subForm(Form):
    name = TextField("Description")
    step = FieldList(FormField(subSubForm), min_entries=1)

class mainForm(Form):
   sub_form = FieldList(FormField(subForm), min_entries=1)

以及 Jinja2 模板：

{% for sub_form in form.sub_form %}
      {{ sub_form.form.name(placeholder='Scenario Title') }}
      {% for error in name %}
             {{error}}
      {% endfor %}

      {% for step in form.sub_form %}
            {{ step.form.id(placeholder='#') }}  
            {{ step.form.description(placeholder='description') }}
            {{ step.form.information(placeholder='info xch') }}
       {% endfor %}
   {% endfor %}
{% endfor %}

以上仅显示 sub_form.form.name 字段。如何进行嵌套迭代以便同时显示 step 字段？

Answer 1

您的模板中的第二个嵌套循环似乎有误。这是它的固定版本：

{% for sub_form in form.sub_form %}
      {{ sub_form.form.name(placeholder='Scenario Title') }}
      {% for error in name %}
             {{error}}
      {% endfor %}

      {% for step in sub_form.step %}
            {{ step.form.step(placeholder='#') }}  
            {{ step.form.description(placeholder='description') }}
            {{ step.form.information(placeholder='info xch') }}
      {% endfor %}
{% endfor %}

这呈现为：

<input id="sub_form-0-name" name="sub_form-0-name" placeholder="Scenario Title" type="text" value="">
<input id="sub_form-0-step-0-step" name="sub_form-0-step-0-step" placeholder="#" type="text" value="">  
<input id="sub_form-0-step-0-description" name="sub_form-0-step-0-description" placeholder="description" type="text" value="">
<textarea id="sub_form-0-step-0-information" name="sub_form-0-step-0-information" placeholder="info xch"></textarea>

遍历嵌套的 FormField

Iterating through a nested FormField

python

jinja2

flask

wtforms

flask-wtforms