Wtforms, Add A Class To A Form Dynamically

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)]) T

Solution 1:

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

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

Solution 2:

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. 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>

2. Create a custom widget mixin that provides the class name:

   from wtforms.fields import StringField
   from wtforms.widgets import TextInput
   
   classClassedWidgetMixin(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)
           returnsuper(ClassedWidgetMixin, self).__call__(field, **kwargs)
   
   # An exampleclassClassedTextInput(ClassedWidgetMixin, TextInput):
       passclassCompany(Form):
       company_name = StringField('Company Name', widget=ClassedTextInput)
   

Solution 3:

Use render_kw if using WTForms >= 2.1 :

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

Solution 4:

In your template, try it

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