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django-progressiveimagefield-0.1.5


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توضیحات

A Django ImageField that offers progressive image loading during HTML rendering.
ویژگی مقدار
سیستم عامل -
نام فایل django-progressiveimagefield-0.1.5
نام django-progressiveimagefield
نسخه کتابخانه 0.1.5
نگهدارنده []
ایمیل نگهدارنده []
نویسنده Nick Mavrakis
ایمیل نویسنده mavrakis.n@gmail.com
آدرس صفحه اصلی https://github.com/manikos/django-progressiveimagefield
آدرس اینترنتی https://pypi.org/project/django-progressiveimagefield/
مجوز -
Progressive Image Model Field for Django ---------------------------------------- Requires: - Python 3.6+ - Pillow 4.0+ - Django 2.0+ *The Problem*: So, you have build a website (portfolio, news, eshop etc), you have optimized your static files (css, js, fonts, images) but still, the webpage loads quite slow due to lots of images being rendered (however, there might be other reasons, but right now, let’s focus on the image rendering). *The Solution*: Based on `José Manuel Pérez <https://jmperezperez.com/about-me>`__\ ’s article about `How Medium does progressive image loading <https://jmperezperez.com/medium-image-progressive-loading-placeholder>`__, I have created a Django ModelField, which I called ``ProgressiveImageField``. All it does is this: when an instance’s progressiveimagefield is created (saved, most commonly via the admin interface), it automatically creates a very small blurred thumbnail (maximum dimensions ``10x10px``) next to the original image. When this large image is rendered, the ``src`` attribute of the ``img`` element points to the thumbnail and not the large image. So, the user, initially, sees the blurred thumbnail. Behind the scenes, javascript takes place and gradually downloads the original image. Once the original image is downloaded, the blurred thumbnail is replaced through a nice-looking-CSS-fade effect. That’s all! Installation ------------ 1. Install it using pip: ``pip install django-progressiveimagefield`` 2. Add it to your ``INSTALLED_APPS`` inside your ``settings`` file: ``INSTALLED_APPS += ['progressiveimagefield']`` How to use ---------- Inside your ``models.py``, simply: .. code:: python from django.db import models from progressiveimagefield.fields import ProgressiveImageField class MyModel(models.Model): # Other fields here img = ProgressiveImageField(upload_to="somewhere") Inside your ``base.html`` template: .. code:: html {% load static %} <!DOCTYPE html> <html> <head> <!-- other meta tags here etc --> <link rel="stylesheet" media="all" href="{% static 'progressiveimagefield/css/pif.css' %}"> </head> <body> {% block content %}{% endblock %} <script src="{% static 'progressiveimagefield/js/pif.js' %}"></script> </body> </html> Finally, inside another HTML template where you want to render your image progressively, you have two options depending on which template engine is used to render your template: - Using the DTL (Django Template Language) .. code:: html {% load progressive_tags %} {% block content %} {% render_progressive_field instance.img %} {% endblock %} - Using the `Jinja2 Template Language <http://jinja.pocoo.org/>`__ 1. Add the filter inside the file (i.e ``jinja.py``) where Jinja2 Environment is defined .. code:: python from jinja2 import Environment def environment(**options): env = Environment(**options) env.filters.update({ 'progressive': 'progressiveimagefield.jinja.progressive', }) return env 2. Add the dotted path to the above function in your ``settings``'s ``TEMPLATES`` setting ``OPTIONS`` dict as the value to the ``environment`` key. OK, here is the code: .. code:: python TEMPLATES = [ { 'BACKEND': 'django.template.backends.jinja2.Jinja2', 'DIRS': # setting for DIRS here, 'APP_DIRS': True, 'OPTIONS': { 'environment': 'path.to.jinja.environment.function', }, }, ... ] 3. Use it in your HTML template like this (just like a regular Django filter): .. code:: html {% block content %} {{ instance.img|progressive }} {% endblock %} Testing ------- In order to test this application, you should 1. Clone the repo 2. Create a virtualenv (``mkvirtualenv -p $(which python3.6) progressiveimagefield``) and activate it (once created, it’ll be activated by default) 3. Install the requirements (``pip install -r tests/test_requirements.txt``) 4. Run ``python runtests.py`` Further Reading --------------- `Page Load Optimization by Progressive Image Loading (like Medium) <https://blog.botreetechnologies.com/page-load-optimization-by-progressive-image-loading-like-medium-1d0f94744a4d>`__


نیازمندی

مقدار نام
>=2.0.11 Django
>=4.0.0 Pillow


زبان مورد نیاز

مقدار نام
>=3.6 Python


نحوه نصب


نصب پکیج whl django-progressiveimagefield-0.1.5:

    pip install django-progressiveimagefield-0.1.5.whl


نصب پکیج tar.gz django-progressiveimagefield-0.1.5:

    pip install django-progressiveimagefield-0.1.5.tar.gz