# Τεκμηρίωση του Django - 6.0.7

# 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 `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 template (as a string) or raise `TemplateDoesNotExist`.

class BaseRenderer

  The base class for the built-in form renderers.

  form_template_name

    The default name of the template to use to render a form.

    Defaults to `"django/forms/div.html"` template.

  formset_template_name

    The default name of the template to use to render a formset.

    Defaults to `"django/forms/formsets/div.html"` template.

  field_template_name

    The default name of the template used to render a `BoundField`.

    Defaults to `"django/forms/field.html"`

  bound_field_class

    The default class used to represent form fields across the project.

    Defaults to `BoundField` class.

    This can be customized further using `Form.bound_field_class` for per-form overrides, or `Field.bound_field_class` for per-field overrides.

  get_template(template_name)

    Subclasses must implement this method with the appropriate template finding logic.

  render(template_name, context, request=None)

    Renders the given template, or raises `TemplateDoesNotExist`.

## Built-in-template form renderers

### `DjangoTemplates`

class 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.

### `Jinja2`

class 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.

### `TemplatesSetting`

class 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.

## Context available in formset templates

Formset templates receive a context from `BaseFormSet.get_context()`. By default, formsets receive a dictionary with the following values:

- `formset`: The formset instance.

## Context available in form templates

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.

## Context available in field templates

Field templates receive a context from `BoundField.get_context()`. By default, fields receive a dictionary with the following values:

- `field`: The `BoundField`.

## Context available in widget templates

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.

## Overriding built-in formset templates

`BaseFormSet.template_name`

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.

## Overriding built-in form templates

`Form.template_name`

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.

## Overriding built-in field templates

`Field.template_name`

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.

## 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 `TemplatesSetting` renderer. Then overriding widget templates works the same as overriding any other template in your project.