Question

I want to style a wtform field through a custom widget but the rendering keeps returning raw html code (with ampersands). Why?

this is my widget:

def my_widget(field, **kwargs):
    field_id = kwargs.pop('id', field.id)
    html = [u'<input class="my_class" %s value="" type="text">' % html_params(id=field_id, name=field_id)]
    return u''.join(html)

Answer 1

You need to tell than string should be rendered as is without escaping HTML:

from wtforms.widget.core import HTMLString

def my_widget(field, **kwargs):
    ....
    return HTMLString(u''.join(html))