Book Image

JavaScript from Frontend to Backend

By : Eric Sarrion
Book Image

JavaScript from Frontend to Backend

By: Eric Sarrion

Overview of this book

JavaScript, the most widely used programming language in the world, has numerous libraries and modules and a dizzying array of need-to-know topics. Picking a starting point can be difficult. Enter JavaScript from Frontend to Backend. This concise, practical guide will get you up to speed in next to no time. This book begins with the basics of variables and objects in JavaScript and then moves quickly on to building components on the client-side with Vue.js and a simple list management application. After that, the focus shifts to the server-side and Node.js, where you’ll examine the MVC model and explore the Express module. Once you've got to grips with the server-side and the client-side, the only thing that remains is the database. You’ll discover MongoDB and the Mongoose module. In the final chapter of this fast-paced guide, you'll combine all these pieces to integrate a Vue.js application into a Node.js server, using Express to structure the server code and MongoDB to store the information. By the end of this book, you will have the skills and confidence to successfully implement JavaScript concepts in your own projects and begin your career as a JavaScript developer.
Table of Contents (14 chapters)
1
Part 1: JavaScript Syntax
4
Part 2: JavaScript on the Client-Side
8
Part 3: JavaScript on the Server-Side

Using the $event parameter

Vue.js provides access to the Event object associated with the event. This object can then be used to get additional information about the event. The information is different depending on the type of event:

  • Mouse coordinates or buttons clicked on the mouse for a mouse-related event
  • Keyboard key used, or the combination of keys pressed (Ctrl, Shift, Esc, and so on) for a keyboard-related event

The Event object can be accessed from the $event variable. It can be passed as a parameter to a processing method. This parameter will then be retrieved in the event processing function.

Let’s see two examples of how to use this parameter when entering characters in an edit control:

  • By displaying an error message as soon as the numerical value entered equals or exceeds the value 100
  • By prohibiting the entry of characters other than numeric characters if the edit control can only contain numbers (this is an improvement of the previous...