Django's form widgets are rendered using Django's template engines system.
The form rendering process can be customized at several levels:
Widgets can specify custom template names.
Forms and widgets can specify custom renderer classes.
A widget's template can be overridden by a project. (Reusable applications typically shouldn't override built-in templates because they might conflict with a project's custom templates.)
The rendering of form templates is controlled by a customizable renderer class.
A custom renderer can be specified by updating the FORM_RENDERER
setting. It defaults to
'django.forms.renderers.DjangoTemplates'.
By specifying a custom form renderer and overriding
form_template_name you can adjust the default form
markup across your project from a single place.
You can also provide a custom renderer per-form or per-widget by setting the
Form.default_renderer attribute or by using the renderer argument
of Form.render(), or Widget.render().
Matching points apply to formset rendering. See Using a formset in views and templates for discussion.
Use one of the built-in template form renderers or implement your own. Custom renderers
must implement a render(template_name, context, request=None) method. It
should return a rendered templates (as a string) or raise
TemplateDoesNotExist.
The base class for the built-in form renderers.
The default name of the template to use to render a form.
Defaults to "django/forms/div.html" template.
The default name of the template to use to render a formset.
Defaults to "django/forms/formsets/div.html" template.
The default name of the template used to render a BoundField.
Defaults to "django/forms/field.html"
Subclasses must implement this method with the appropriate template finding logic.
Renders the given template, or raises
TemplateDoesNotExist.
DjangoTemplates¶This renderer uses a standalone
DjangoTemplates
engine (unconnected to what you might have configured in the
TEMPLATES setting). It loads templates first from the built-in form
templates directory in django/forms/templates and then from the
installed apps' templates directories using the app_directories loader.
If you want to render templates with customizations from your
TEMPLATES setting, such as context processors for example, use the
TemplatesSetting renderer.
Deprecated since version 5.0.
The alias of DjangoTemplates.
Jinja2¶This renderer is the same as the DjangoTemplates renderer except that
it uses a Jinja2 backend. Templates
for the built-in widgets are located in django/forms/jinja2 and
installed apps can provide templates in a jinja2 directory.
To use this backend, all the forms and widgets in your project and its
third-party apps must have Jinja2 templates. Unless you provide your own Jinja2
templates for widgets that don't have any, you can't use this renderer. For
example, django.contrib.admin doesn't include Jinja2 templates for its
widgets due to their usage of Django template tags.
Deprecated since version 5.0.
The alias of Jinja2.
TemplatesSetting¶This renderer gives you complete control of how form and widget templates are
sourced. It uses get_template() to find templates
based on what's configured in the TEMPLATES setting.
Using this renderer along with the built-in templates requires either:
'django.forms' in INSTALLED_APPS and at least one engine
with APP_DIRS=True.
Adding the built-in templates directory in DIRS
of one of your template engines. To generate that path:
import django
django.__path__[0] + "/forms/templates" # or '/forms/jinja2'
Using this renderer requires you to make sure the form templates your project needs can be located.
Formset templates receive a context from BaseFormSet.get_context(). By
default, formsets receive a dictionary with the following values:
formset: The formset instance.
Form templates receive a context from Form.get_context(). By default,
forms receive a dictionary with the following values:
form: The bound form.
fields: All bound fields, except the hidden fields.
hidden_fields: All hidden bound fields.
errors: All non field related or hidden field related form errors.
Field templates receive a context from BoundField.get_context(). By
default, fields receive a dictionary with the following values:
field: The BoundField.
Widget templates receive a context from Widget.get_context(). By
default, widgets receive a single value in the context, widget. This is a
dictionary that contains values like:
name
value
attrs
is_hidden
template_name
Some widgets add further information to the context. For instance, all widgets
that subclass Input defines widget['type'] and MultiWidget
defines widget['subwidgets'] for looping purposes.
To override formset templates, you must use the TemplatesSetting
renderer. Then overriding formset templates works the same as overriding any other template in your project.
To override form templates, you must use the TemplatesSetting
renderer. Then overriding form templates works the same as overriding any other template in your project.
To override field templates, you must use the TemplatesSetting
renderer. Then overriding field templates works the same as overriding any other template in your project.
Each widget has a template_name attribute with a value such as
input.html. Built-in widget templates are stored in the
django/forms/widgets path. You can provide a custom template for
input.html by defining django/forms/widgets/input.html, for example.
See Built-in widgets for the name of each widget's template.
To override widget templates, you must use the TemplatesSetting
renderer. Then overriding widget templates works the same as overriding any other template in your project.
Jan 15, 2024