Django Render Block ###################
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Render the content of a specific block tag from a Django template. Works for
arbitrary template inheritance, even if a block is defined in the child template
but not in the parent. Generally it works like render_to_string from Django,
but allows you to specify a block to render.
Jinja2 <http://jinja.pocoo.org/>__ engine: it does
not currently process the extends tag.Django Render Block supports Django 4.2, 5.0, and 5.1 on Python 3.8, 3.9, 3.10, 3.11 and 3.12 (see the Django documentation for which versions of Python are supported by particular Django versions).
In test1.html:
.. code-block:: jinja
{% block block1 %}block1 from test1{% endblock %}
{% block block2 %}block2 from test1{% endblock %}
In test2.html:
.. code-block:: jinja
{% extends 'test1.html' %}
{% block block1 %}block1 from test2{% endblock %}
And from the Python shell:
.. code-block:: python
>>> from render_block import render_block_to_string
>>> print(render_block_to_string('test2.html', 'block1'))
'block1 from test2'
>>> print(render_block_to_string('test2.html', 'block2'))
'block2 from test1'
It can also accept a context as a dict (just like render_to_string), in
test3.html:
.. code-block:: jinja
{% block block3 %}Render this {{ variable }}!{% endblock %}
And from Python:
.. code-block:: python
>>> print(render_block_to_string('test3.html', 'block3', {'variable': 'test'}))
'Render this test!'
The API is simple and attempts to mirror the built-in render_to_string API.
render_block_to_string(template_name, block_name, context=None, request=None)
``template_name``
The name of the template to load and render. If it’s a list of template
names, Django uses ``select_template()`` instead of ``get_template()``
to find the template.
``block_name``
The name of the block to render from the above template.
``context``
A ``dict`` to be used as the template’s context for rendering. A ``Context``
object can be provided for Django templates.
``context`` is optional. If not provided, an empty context will be used.
``request``
The request object used to render the template.
``request`` is optional and works only for Django templates. If both context and request
are provided, a ``RequestContext`` will be used instead of a ``Context``.
Like render_to_string this will raise the following exceptions:
``TemplateDoesNotExists``
Raised if the template(s) specified by ``template_name`` cannot be
loaded.
``TemplateSyntaxError``
Raised if the loaded template contains invalid syntax.
There are also two additional errors that can be raised:
``BlockNotFound``
Raised if the block given by ``block_name`` does not exist in the
template.
``UnsupportedEngine``
Raised if a template backend besides the Django backend is used.
If you find a bug or have an idea for an improvement to Django Render Block,
please
file an issue <https://github.com/clokep/django-render-block/issues/new>_ or
provide a pull request! Check the
list of issues <https://github.com/clokep/django-render-block/issues/>_ for
ideas of what to work on.
This is based on a few sources:
Django Snippet 769 <https://djangosnippets.org/snippets/769/>__Django Snippet 942 <https://djangosnippets.org/snippets/942/>__Django-Block-Render <https://github.com/uniphil/Django-Block-Render/>_django-templated-email <https://github.com/BradWhittington/django-templated-email/blob/master/templated_email/utils.py>_StackOverflow answer 2687173 <http://stackoverflow.com/questions/2687173/django-how-can-i-get-a-block-from-a-template>_.. :changelog:
Changelog #########
No changes from 0.10b1.
@yaakovLowenstein <https://github.com/yaakovLowenstein>. (#52 <https://github.com/clokep/django-render-block/pull/52>)#56 <https://github.com/clokep/django-render-block/pull/56>_)#44 <https://github.com/clokep/django-render-block/pull/44>,
#55 <https://github.com/clokep/django-render-block/pull/55>)#44 <https://github.com/clokep/django-render-block/pull/44>_)#44 <https://github.com/clokep/django-render-block/pull/44>,
#55 <https://github.com/clokep/django-render-block/pull/55>)#44 <https://github.com/clokep/django-render-block/pull/44>,
#55 <https://github.com/clokep/django-render-block/pull/55>)#54 <https://github.com/clokep/django-render-block/pull/54>_)#36 <https://github.com/clokep/django-render-block/pull/36>_)#37 <https://github.com/clokep/django-render-block/pull/37>_)black <https://black.readthedocs.io/>, isort <https://pycqa.github.io/isort/>,
and flake8 <https://flake8.pycqa.org>, and pyupgrade <https://github.com/asottile/pyupgrade>.
(#38 <https://github.com/clokep/django-render-block/pull/38>,
#39 <https://github.com/clokep/django-render-block/pull/39>)Jack Linke <https://github.com/jacklinke>.
(#41 <https://github.com/clokep/django-render-block/pull/41>)#33 <https://github.com/clokep/django-render-block/pull/33>_)@cordery <https://github.com/cordery>. (#35 <https://github.com/clokep/django-render-block/pull/35>)#31 <https://github.com/clokep/django-render-block/pull/31>_)#27 <https://github.com/clokep/django-render-block/pull/27>,
#31 <https://github.com/clokep/django-render-block/pull/31>)#26 <https://github.com/clokep/django-render-block/pull/26>,
#28 <https://github.com/clokep/django-render-block/pull/28>)setup.cfg.
(#32 <https://github.com/clokep/django-render-block/pull/32>_)Context could not be re-used. Contributed
by @evanbrumley <https://github.com/evanbrumley>. (#25 <https://github.com/clokep/django-render-block/pull/25>)render_block_to_string now forwards the Context passed as context parameter.
Contributed by @bblanchon <https://github.com/bblanchon>. (#21 <https://github.com/clokep/django-render-block/pull/21>)#22 <https://github.com/clokep/django-render-block/pull/22>_)#18 <https://github.com/clokep/django-render-block/pull/18>_)#18 <https://github.com/clokep/django-render-block/pull/18>,
#20 <https://github.com/clokep/django-render-block/pull/20>)#19 <https://github.com/clokep/django-render-block/pull/19>_)#18 <https://github.com/clokep/django-render-block/pull/18>_)render_block_to_string now optionally accepts a request parameter.
If given, a RequestContext instead of a Context is used when
rendering with the Django templating engine. Contributed by
@vintage <https://github.com/vintage>. (#15 <https://github.com/clokep/django-render-block/pull/15>)#9 <https://github.com/clokep/django-render-block/pull/9>,
#11 <https://github.com/clokep/django-render-block/pull/11>,
#17 <https://github.com/clokep/django-render-block/pull/17>_)#9 <https://github.com/clokep/django-render-block/pull/9>,
#17 <https://github.com/clokep/django-render-block/pull/17>)@mixxorz <https://github.com/mixxorz>.
(#10 <https://github.com/clokep/django-render-block/pull/10>)#8 <https://github.com/clokep/django-render-block/pull/8>_)Jinja2 <http://jinja.pocoo.org/>_ templating
engine. See README for caveats. (#3 <https://github.com/clokep/django-render-block/pull/3>_)#5 <https://github.com/clokep/django-render-block/pull/5>_)#6 <https://github.com/clokep/django-render-block/pull/6>_)Largely rewritten.
Support Django 1.8 and 1.9:
context_instance parameter.{{ block.super }}.comment 3466 on Django Snippet 942 <https://djangosnippets.org/snippets/942/#c3466>_
by eugenyboger <https://djangosnippets.org/users/eugenyboger/>_
to fix an issue with nested extends. The specific bug was not reproducible,
but the additional code shouldn't hurt.comment 3237 on Django Snippet 942 <https://djangosnippets.org/snippets/942/#c3237>_
by chadselph <https://djangosnippets.org/users/chadselph/>_
to remove a pointless render. The specific bug was not reproducible, but the
removed code was extraneous.Updated version from
Django Snippet 942 <https://djangosnippets.org/snippets/942/>_ by
zbyte64 <https://djangosnippets.org/users/zbyte64/>_.
Improves include:
render_to_responseDjango Snippet 769 <https://djangosnippets.org/snippets/769/>_ by
sciyoshi <https://djangosnippets.org/users/sciyoshi/>_.FAQs
Render a particular block from a template to a string.
We found that django-render-block demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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