Wtforms，动态添加一个类到窗体 [英] Wtforms, add a class to a form dynamically

问题描述

有没有办法我可以发送表单的（css）类从python？
例如：

is there a way i could send a form's (css) class from python? For example:

class Company(Form):
    companyName = TextField('Company Name', [validators.Length(min=3, max = 60)])

，但我想让文本字段拥有 .companyName 的css类，是否可能直接从python？

This renders a simple text field, but i want that text field to have the css class of .companyName, is that possible directly from python?

我知道我可以直接从python中放入 id =companyName，而不是类。

I know that i can put a id="companyName" directly from python, but not class.

帮助。

更新：
我尝试了 class _ =companyName ：

__init__() got an unexpected keyword argument '_class'

推荐答案

WTForms不允许在字段初始化中设置显示选项（如类名）。但是，有几种方法可以解决此问题：

WTForms does not allow you to set display options (such as class name) in the field initialization. However, there are several ways to get around this:

1. 如果所有字段都应包含类名称ID，然后只需传入每个字段的 short_name ：

<dl>
{% for field in form %}
<dt>{{field.label}}</dt>
<dd>{{field(class_=field.short_name)}}</dd>
{% endfor %}
</dl>

创建自定义小部件 mixin，它提供类名称：

Create a custom widget mixin that provides the class name:

from wtforms.fields import StringField
from wtforms.widgets import TextInput

class ClassedWidgetMixin(object):
    """Adds the field's name as a class 
    when subclassed with any WTForms Field type.

    Has not been tested - may not work."""
    def __init__(self, *args, **kwargs):
        super(ClassedWidgetMixin, self).__init__(*args, **kwargs)

    def __call__(self, field, **kwargs):
        c = kwargs.pop('class', '') or kwargs.pop('class_', '')
        kwargs['class'] = u'%s %s' % (field.short_name, c)
        return super(ClassedWidgetMixin, self).__call__(field, **kwargs)

# An example
class ClassedTextInput(ClassedWidgetMixin, TextInput):
    pass

class Company(Form):
    company_name = StringField('Company Name', widget=ClassedTextInput)

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