Getting started with Javascript
Professional Training
Published on 19. February 2021
137 pages
978-2-490275-42-7 (ISBN)
Description
In this book you will learn how to write the JavaScript code. This language is used to control the web pages elements that are designed with HTML tags. You will discover the objects structure and their interaction inside the DOM (Document Object Model) that is represented by a tag tree. You will practice variables, conditional expressions and loops thanks to several workshops. You will study the methods that handle texts, numbers and dates. JavaScript enables you to manage events that occur in the web page, such as a mouse click or an exit from a field. The duo JavaScript/HTML has many assets that will help you to control your web pages better.
À PROPOS DE L'AUTEUR
Remy Lentzner has been a computer trainer since 1985. Specialized in mastering office automation tools, he supports companies in the professional training of their employees. Self-taught, he has fifteen computer books to his credit.
À PROPOS DE L'AUTEUR
Remy Lentzner has been a computer trainer since 1985. Specialized in mastering office automation tools, he supports companies in the professional training of their employees. Self-taught, he has fifteen computer books to his credit.
More details
Content
- Intro
- Chapter 1Fundamentals
- 1.1 The efficient JavaScript/HTML duo
- 1.1.1 The Brackets editor helps to code
- 1.1.2 A web page without JavaScript code
- 1.1.3 An example with JavaScript coding
- 1.2 The DOM or the tags tree
- 1.2.1 The querySelector() and getElementById() methods
- 1.2.2 Creating the web page directly in JavaScript
- 1.2.3 Comments
- 1.3 Where can I find information about JavaScript?
- 1.4 The variables
- 1.4.1 Declaration and assignment
- 1.4.2 Scope of variables
- 1.4.3 Scripts without function
- 1.5 The functions
- 1.5.1 Creating a function
- 1.5.2 Calling a function
- 1.5.3 Passing values into a function
- 1.5.4 Passing variables into a function
- 1.5.5 Anonymous functions
- Chapter 2Control structures
- 2.1 The conditions
- 2.1.1 if
- 2.1.2 if ... else
- 2.1.3 if ... elseif ... else
- 2.1.4 switch
- 2.2 Comparison operators
- 2.3 Loops
- 2.3.1 while
- 2.3.2 do...while
- 2.3.3 for
- 2.3.4 for ... of
- Chapter 3Events
- 3.1 Events caused by the Internet user
- 3.1.1 Keyboard events
- Capturing a key with keypress
- Coloring when entering text
- Ctrl, Alt, Shift and A with a keydown event
- Pressing several keys at the same time
- 3.1.2 Mouse events
- Displaying two images according to the left click
- Mouse position on a map of Europe
- An image cut into several parts
- 3.2 Events in a form
- 3.2.1 About the form element structure
- 3.2.2 Tags that create elements
- 3.2.3 The &input& tag
- 3.2.4 Workshop : a form to request information
- 3.3 AddEventListener and bubbling
- 3.3.1 Listening to a click on 3 images
- 3.3.2 Checking empty fields in a form
- 3.3.3 The boiling of events
- How can this bubbling help us ?
- An example without bubbling
- Bubbling avoids redundancy
- Chapter 4Text, number and date
- 4.1 Manipulating strings of characters
- 4.1.1 Concatenating string
- 4.1.2 Concatenating special characters
- 4.1.3 The length property
- 4.1.4 The confirm dialog box
- 4.1.5 Text manipulation methods
- 4.2 Number manipulation
- 4.2.1 Accuracy and rounding
- 4.2.2 The very important parseFloat method
- 4.2.3 The Math objects
- 4.3 Handling dates
- 4.3.1 Calculating your age
- 4.3.2 Methods that affect dates
