Add a css class to a field in wtform

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You actually don’t need to go to the widget level to attach an HTML class attribute to the rendering of the field. You can simply specify it using the class_ parameter in the jinja template.

e.g. 

    {{ form.email(class_="form-control") }}

will result in the following HTML::

    <input class="form-control" id="email" name="email" type="text" value="">

to do this dynamically, say, using the name of the form as the value of the HTML class attribute, you can do the following:

Jinja:

    {{ form.email(class_="form-style-"+form.email.name) }}

Output:

    <input class="form-style-email" id="email" name="email" type="text" value="">

For more information about injecting HTML attributes, check out the official documentation.

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