JavaScript Essentials for Dummies.

Format:

Book

Author/Creator:

McFedries, Paul.

Series:

--For dummies.

--For dummies

Language:

English

Subjects (All):

JavaScript (Computer program language).

Physical Description:

1 online resource (195 pages)

Edition:

1st ed.

Place of Publication:

Newark : John Wiley & Sons, Incorporated, 2024.

Summary:

JavaScript® Essentials by Paul Essentials is a comprehensive guide for beginners and intermediate developers to understand and utilize JavaScript effectively in web development. The book covers fundamental topics such as adding JavaScript to web pages, managing variables, building expressions, controlling program flow, utilizing functions, and interacting with the Document Object Model (DOM). It also delves into advanced topics like working with arrays, manipulating strings and dates, and debugging JavaScript code. The author's purpose is to provide readers with practical knowledge and strategies for writing efficient JavaScript code, making it suitable for anyone looking to enhance their programming skills. The book is part of the For Dummies series, known for its accessible and engaging writing style. Generated by AI.

Contents:

Intro

Title Page

Copyright Page

Table of Contents

Introduction

About This Book

Foolish Assumptions

Icons Used in This Book

Where to Go From Here

Chapter 1 JavaScript: The Big Picture

Adding JavaScript Code to a Web Page

The &lt

script&gt

tag

Where do you put the &lt

tag?

Example #1: Displaying a message to the user

Example #2: Writing text to the page

What You Need to Get Started

Dealing with Two Exceptional Cases

Handling browsers with JavaScript turned off

Handling very old browsers

Commenting Your Code

Moving to External JavaScript Files

Chapter 2 Programming with Variables

Getting Your Head around Variables

Declaring a variable with let

Storing a value in a variable

Checking out another way to declare a variable: const

Using variables in statements

Naming Variables: Rules and Best Practices

Rules for naming variables

Ideas for good variable names

Understanding Literal Data Types

Working with numeric literals

Exponential notation

Hexadecimal integer values

Working with string literals

Using quotation marks within strings

Understanding escape sequences

Working with Boolean literals

Chapter 3 Building Expressions

Understanding How Expressions Are Structured

Creating Numeric Expressions

Building String Expressions

Building Comparison Expressions

Building Logical Expressions

Understanding Operator Precedence

The order of precedence

Controlling the order of precedence

Chapter 4 Controlling the Flow of JavaScript

Decision-Making with if Statements

Branching with if. . .else Statements

Understanding the Value of Code Looping

Working with while Loops

Working with for Loops

Working with do. . .while Loops

Chapter 5 Harnessing the Power of Functions.

Getting to Know the Function Structure

Making a Function Call

When the browser parses the &lt

When the page load is complete

When an event fires

Passing One or More Values to a Function

Passing one value to a function

Passing two or more values to a function

Getting a Value from a Function

Working with Anonymous Functions

Assigning an anonymous function to a variable

Replacing a function call with an anonymous function

Working with Arrow Functions

Chapter 6 Coding the Document Object Model

Getting Familiar with Objects

Working with object properties

Working with object methods

Introducing the Document Object Model

Specifying Elements in Your Code

Specifying an element by id

Specifying elements by tag name

Specifying elements by class name

Specifying elements by selector

Working with collections of elements

Touring the DOM with Code

Getting the children of a parent element

Getting all the child nodes

Getting the first child node

Getting the last child node

Getting the parent of a child element

Getting the siblings of an element

Getting the previous sibling

Getting the next sibling

Adding, Modifying, and Removing Elements

Adding an element to the page

Step 1: Creating the element

Step 2: Adding the new element as a child

Step 3: Adding text and tags to the new element

Inserting text or HTML into an element

Removing an element

Using Code to Mess Around with CSS

Changing an element's styles

Adding a class to an element

Removing a class

Toggling a class

Using Code to Tweak HTML Attributes

Reading an attribute value

Setting an attribute value

Removing an attribute

Listening for Page Events

Chapter 7 Working with Arrays

What Is an Array?

Declaring an Array

Populating an Array.

Declaring and populating an array at the same time

Populating an array using a loop

Iterating Arrays

Iterating an array: forEach()

Iterating to create a new array: map()

Iterating an array down to a value: reduce()

Iterating to locate an element: find()

Manipulating Arrays

The length property

Some useful array methods

Chapter 8 Coding Strings and Dates

Manipulating Strings

Working with string templates

Determining the length of a string

Searching for substrings

Learning the methods that extract substrings

Dealing with Dates and Times

Learning the arguments used with the Date object

Getting to know the Date object

Specifying the current date and time

Specifying any date and time

Getting info about a date

Setting the date

Chapter 9 Debugging JavaScript

Laying Out Your Debugging Tools

Debugging 101: Using the Console

Getting the console onscreen

Printing program data in the Console

Running code in the Console

Putting Your Code into Break Mode

Invoking break mode

Setting a breakpoint

Adding a debugger statement

Getting out of break mode

Stepping Through Your Code

Stepping one statement at a time

Stepping into some code

Stepping over some code

Stepping out of some code

Chapter 10 Dealing with Form Data

Coding Text Fields

Referencing by field type

Getting a text field value

Setting a text field value

Programming Checkboxes

Referencing checkboxes

Getting the checkbox state

Setting the checkbox state

Coding Radio Buttons

Referencing radio buttons

Getting a radio button state

Setting the radio button state

Programming Selection Lists

Referencing selection list options

Getting the selected list option

Changing the selected option

Working with Form Events

Setting the focus.

Monitoring the focus event

Monitoring the blur event

Listening for element changes

Handling Form Data

Chapter 11 Ten JavaScript Debugging Strategies

Get Thee to Your Dev Tools

The Console Is Your Best Debugging Friend

Give Your Code a Break(point)

Step Through Your Code

Monitor Variable and Object Property Values

Indent Your Code

Break Down Complex Tasks

Break Up Long Statements

Comment Out Problem Statements

Use Comments To Document Your Scripts

Index

EULA.

Notes:

Description based on publisher supplied metadata and other sources.

Part of the metadata in this record was created by AI, based on the text of the resource.

ISBN:

1-394-26323-6

OCLC:

1428196811