# Integration

## Flask

The Flask web application framework, also maintained by Pallets, uses Jinja templates by default. Flask sets up a Jinja environment and template loader for you, and provides functions to easily render templates from view functions.

## Django

Django supports using Jinja as its template engine, see https://docs.djangoproject.com/en/stable/topics/templates/#support-for-template-engines.

## Babel

Jinja provides support for extracting gettext messages from templates via a Babel extractor entry point called `jinja2.ext.babel_extract`. The support is implemented as part of the i18n Extension extension.

Gettext messages are extracted from both `trans` tags and code expressions.

To extract gettext messages from templates, the project needs a Jinja section in its Babel extraction method mapping file:

    [jinja2: **/templates/**.html]
    encoding = utf-8

The syntax related options of the `Environment` are also available as configuration values in the mapping file. For example, to tell the extractor that templates use `%` as `line_statement_prefix` you can use this code:

    [jinja2: **/templates/**.html]
    encoding = utf-8
    line_statement_prefix = %

Extensions may also be defined by passing a comma separated list of import paths as the `extensions` value. The i18n extension is added automatically.

Template syntax errors are ignored by default. The assumption is that tests will catch syntax errors in templates. If you don’t want to ignore errors, add `silent = false` to the settings.

## Pylons

It’s easy to integrate Jinja into a Pylons application.

The template engine is configured in `config/environment.py`. The configuration for Jinja looks something like this:

    from jinja2 import Environment, PackageLoader
    config['pylons.app_globals'].jinja_env = Environment(
        loader=PackageLoader('yourapplication', 'templates')
    )

After that you can render Jinja templates by using the `render_jinja` function from the `pylons.templating` module.

Additionally it’s a good idea to set the Pylons `c` object to strict mode. By default attribute access on missing attributes on the `c` object returns an empty string and not an undefined object. To change this add this to `config/environment.py`:

    config['pylons.strict_c'] = True