Python Flask-Assets Introduction and User Tutorial
Python Flask-Asseets Introduction and Tutorial
Overview
Python Flask-Assets is a expansion library for static resource management. It can simplify the process of using CSS and JavaScript resources in FLASK applications.It provides an intuitive interface to process and merge CSS and JavaScript files, and automatically perform compression and version management.This tutorial will introduce how to use Python Flask-Assets to manage static resources and related configuration and code examples.
Install
First, make sure that Python and Flask have been installed.You can then use the PIP command to install the Flask-Assets library.
$ pip install Flask-Assets
Configuration
In FLASK applications, some configurations need to be performed to enable Flask-Assets extensions.Create a file called `app.py` and add the following code:
python
from flask import Flask
from flask_assets import Environment, Bundle
app = Flask(__name__)
assets = Environment(app)
# Configure the storage path of static resource file
app.config['STATIC_FOLDER'] = 'static'
# Define CSS and JavaScript resource beams
css_bundle = Bundle(
'css/style1.css',
'css/style2.css',
output='gen/packed.css'
)
js_bundle = Bundle(
'js/script1.js',
'js/script2.js',
output='gen/packed.js'
)
assets.register('css_all', css_bundle)
assets.register('js_all', js_bundle)
In this example code, we first introduced the `Flask` and Flask_asSETS` Module.Then, we created a FLASK application object `app` and a` environment` object `assets` to manage static resources.`Static_folder` The configuration parameters specify the storage path of static resource files.Next, we defined two resource beams `css_bundle` and` js_bundle`, used to store the list of CSS and JavaScript files, and specify the path of the merged output file.Finally, we register the resource beam into the `Assets` object through the method of` Assets.register () `.
The file path in the example code is relative to static resource storage paths.Make sure the CSS and JavaScript files are placed under the correct path, or modify it according to the actual situation.
Resources in the template
Next, we will introduce how to use registered resources in the Flask template.In the `app.py` file, add the following routing and view function:
python
from flask import render_template
@app.route('/')
def index():
return render_template('index.html')
Create a folder called `Templates` in the root directory of Flask application, and create a template file called` index.html` in it.In the template file, we can use the overall variables provided by Flask-Assets to load CSS and JavaScript files.Edit `index.html` file, add the following code:
html
<!DOCTYPE html>
<html>
<head>
{% assets "css_all" %}
<link rel="stylesheet" type="text/css" href="{{ ASSET_URL }}">
{% endassets %}
</head>
<body>
<h1>Hello, Flask-Assets!</h1>
{% assets "js_all" %}
<script src="{{ ASSET_URL }}"></script>
{% endassets %}
</body>
</html>
In the above example code, we use the `Assets` tag to quote the registered resources.For the CSS file, we use the `link` tag to add the corresponding link to the template.For JavaScript files, we use the `script` tag to quote.
Run application
Finally, we need to run Flask applications.Navigate to the application root directory in the terminal and run the following command:
$ FLASK_APP=app.py flask run
Visit "http: // localhost: 5000/", and you will see the page containing the text "Hello, Flask-Assets!", And quote the merged CSS and JavaScript files.
Summarize
This tutorial introduces how to use Python Flask-Assets to manage static resources.Through simple configuration and resource management interface provided by Flask-Assets, you can easily handle and merge CSS and JavaScript files.This can reduce network requests, improve website performance, and provide a better user experience.
