python - 条件 Flask-WTF 表单字段

Question

我想根据他们选择的类别包含或排除表单字段。

我想到的一种方法是这样的。

if form.category.data == "retail":
    # return "Retail Form"
    form = RetailListingForm()
    return render_template('seller/seller_new_listing.html', form=form)
if form.category.data == "wholesale":
    # Return Wholesale
    form = WholeSaleListingForm()
    return render_template('seller/seller_new_listing.html', form=form)

if form.category.data == "wholesale-and-retail":
    # Return Both forms by inheritance
    return render_template('seller/seller_new_listing.html', form=form)

在 html 中。

{% if form == WholeSaleListingForm  %}
    {{render_field(form.whole_sale_price)}}
{% endif  %}

这不起作用，因为如果它不是整体销售形式，则会出现 whole_sale_price 错误和 RetailListingForm 您建议我如何将表单包含在一个模板中。

Answer 1

您可以添加另一个处理表单选择类型的变量，然后将其传递到 render_template 函数中:

if form.category.data == "retail":
    # return "Retail Form"
    type = 'retail'
    form = RetailListingForm()
    return render_template('seller/seller_new_listing.html', form=form, type=type)
elif form.category.data == "wholesale":
    # Return Wholesale
    type = 'wholesale'
    form = WholeSaleListingForm()
    return render_template('seller/seller_new_listing.html', form=form, type=type)
elif form.category.data == "wholesale-and-retail":
    # Return Both forms by inheritance
    return render_template('seller/seller_new_listing.html', form=form, type=None)

然后，在您的模板中，只需使用评估与类型:

{% if type == 'wholesale' %}
    {{ render_field(form.whole_sale_price) }}
{% endif %}