Book Image

Hands-on JavaScript for Python Developers

By : Sonyl Nagale
Book Image

Hands-on JavaScript for Python Developers

By: Sonyl Nagale

Overview of this book

Knowledge of Python is a great foundation for learning other languages. This book will help you advance in your software engineering career by leveraging your Python programming skills to learn JavaScript and apply its unique features not only for frontend web development but also for streamlining work on the backend. Starting with the basics of JavaScript, you’ll cover its syntax, its use in the browser, and its frameworks and libraries. From working with user interactions and ingesting data from APIs through to creating APIs with Node.js, this book will help you get up and running with JavaScript using hands-on exercises, code snippets, and detailed descriptions of JavaScript implementation and benefits. To understand the use of JavaScript in the backend, you’ll explore Node.js and discover how it communicates with databases. As you advance, you’ll get to grips with creating your own RESTful APIs and connecting the frontend and backend for holistic full-stack development knowledge. By the end of this Python JavaScript book, you’ll have the knowledge you need to write full-fledged web applications from start to finish. You’ll have also gained hands-on experience of working through several projects, which will help you advance in your career as a JavaScript developer.
Table of Contents (26 chapters)
1
Section 1 - What is JavaScript? What is it not?
6
Section 2 - Using JavaScript on the Front-End
13
Section 3 - The Back-End: Node.js vs. Python
20
Section 4 - Communicating with Databases

Using dynamic data

Let's first take a look at a Python Flask example:

  1. Navigate to the flask directory in chapter-10 (cd flask).
  2. You'll need to install a few pieces for our setup. These instructions are for Python:
    1. Create a virtual environment with python3 -m venv env.
    2. Activate it using . env/bin/activate.
    3. Install the requirements: pip3 install -r requirements.txt.
    4. Now you can start the application: python3 app.py.
  3. Access the page at http://localhost:5000. You'll see this:
Figure 10.2 – Basic Flask application

Play around with entering and not entering your name and take a look at the fact that the page reloads when you do so (I've added a timestamp to make it easier to see as the page reload can happen too quickly to see). This is a very basic Flask application, and there are more efficient ways to do validation work with a combination of Python and JavaScript, but at a base level, even with some Flask-based form validation tools, the validation and interaction...