Jinja2 macro to render WTForms fields with Twitter Bootstrap. This fork renders the fields according to bootstrap 3.0.0

_formhelpers.py

{% macro render_field(field) -%}
    {% set with_label = kwargs.pop('with_label', False) %}
    {% set placeholder = '' %}
    {% if not with_label %}
        {% set placeholder = field.label.text %}
    {% endif %}
    <div class="form-group {% if field.errors %}error{% endif %}">
        {% if with_label %}
            <label for="{{ field.id }}" class="control-label">
                {{ field.label.text }}{% if field.flags.required %} *{% endif %}:
            </label>
        {% endif %}
        
        {% set class_ = kwargs.pop('class_', '') %}
        {% if field.flags.required %}
            {% set class_ = class_ + ' required' %}
        {% endif %}

        {% if field.type == 'BooleanField' %}
            <div class="checkbox">
                <label>
                    {{ field(class_=class_, **kwargs) }}
                    {{ field.label.text|safe }}
                </label>
            </div>

        {% else %}
       
            {% if field.type in ('TextField', 'TextAreaField', 'PasswordField') %}
                {% set class_ = class_ + ' input-xlarge form-control' %}
          
            {% elif field.type == 'FileField' %}
                {% set class_ = class_ + ' input-file form-control' %}
            {% endif %}

            {% if field.type == 'SelectField' %}
                {{ field(class_=class_, **kwargs) }}
            {% else %}
              
            {{ field(class_=class_, placeholder=placeholder, **kwargs) }}
            {% endif %}
      
        {% endif %}
        {% if field.errors %}
            <span class="error help-inline">{{ field.errors|join(', ') }}</span>
        {% endif %}
        {% if field.description %}
            <p class="help-block">{{ field.description|safe }}</p>
        {% endif %}
    </div>
{%- endmacro %}

Great, I would add 'URLField' to ('TextField', 'TextAreaField', 'PasswordField') tuple.