Wtforms, add a class to a form dynamically

问题

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)])

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?

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

Help.

Update: I tried class_="companyName" and it did not work, i got:

__init__() got an unexpected keyword argument '_class'

回答1:

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:

If all of your fields should include a class name as well as an ID then just pass in each field's short_name to it when you render it:
```
<dl>
{% for field in form %}
<dt>{{field.label}}</dt>
<dd>{{field(class_=field.short_name)}}</dd>
{% endfor %}
</dl>
```

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)

回答2:

Alternatively you can add the class in your template like this for jinja2:

{{ form.name(size=20, class_='input-small') }}

回答3:

Use render_kw if using WTForms >= 2.1 :

submit = SubmitField(u'Block Submit Buttom', render_kw={"class": "btn btn-primary btn-block"})

回答4:

In your template, try it

{{ form.companyName( **{'class': 'companyName'} ) }}

来源：https://stackoverflow.com/questions/11309779/wtforms-add-a-class-to-a-form-dynamically

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