Page 3 - JavaScript

Sending messages 12

Receiving, Validating and Processing Messages 13

Chapter 3: AJAX 15

Introduction 15

Remarks 15

Examples 15

Using GET and no parameters 15

Sending and Receiving JSON Data via POST 15

Displaying the top JavaScript questions of the month from Stack Overflow's API 16

Using GET with parameters 17

Check if a file exists via a HEAD request 17

Add an AJAX preloader 18

Listening to AJAX events at a global level 19
Chapter 4: Anti-patterns 20

Examples 20

Chaining assignments in var declarations. 20

Chapter 5: Arithmetic (Math) 21

Remarks 21

Examples 21

Addition (+) 21

Subtraction (-) 22

Multiplication (*) 22

Division (/) 22
Remainder / Modulus (%) 23

Using modulus to obtain the fractional part of a number 24

Incrementing (++) 24

Decrementing (--) 24

Common Uses 25

Exponentiation (Math.pow() or **) 25

Use Math.pow to find the nth root of a number. 26

Constants 26

Trigonometry 27