The form rendering API¶
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 low-level render API¶
The rendering of form templates is controlled by a customizable renderer class.
A custom renderer can be specified by updating the
setting. It defaults to
You can also provide a custom renderer by setting the
Form.default_renderer attribute or by using the
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
Built-in-template form renderers¶
This renderer uses a standalone
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
If you want to render templates with customizations from your
TEMPLATES setting, such as context processors for example, use the
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
To use this backend, all the 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.
This renderer gives you complete control of how widget templates are sourced.
get_template() to find widget
templates based on what’s configured in the
Using this renderer along with the built-in widget templates requires either:
INSTALLED_APPSand at least one engine with
Adding the built-in widgets templates directory in
DIRSof one of your template engines. To generate that path:
import django django.__path__ + '/forms/templates' # or '/forms/jinja2'
Using this renderer requires you to make sure the form templates your project needs can be located.
Context available in widget templates¶
Widget templates receive a context from
default, widgets receive a single value in the context,
widget. This is a
dictionary that contains values like:
Some widgets add further information to the context. For instance, all widgets
widget['subwidgets'] for looping purposes.
Overriding built-in widget templates¶
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
renderer. Then overriding widget templates works the same as overriding any other template in your project.