كتاب Preview Javascript Tutorial

Preview Javascript Tutorial Table of Contents About the Tutorial ............................................................................................................................................. Audience ........................................................................................................................................................... i Prerequisites ..................................................................................................................................................... i Copyright and Disclaimer ................................................................................................................................. i Table of Contents ............................................................................................................................................ ii PART 1: JAVASCRIPT BASICS ........................................................................................................ 1 1. JAVASCRIPT – Overview ............................................................................................................................ 2 What is JavaScript? .......................................................................................................................................... 2 Client-Side JavaScript....................................................................................................................................... 2 Advantages of JavaScript ................................................................................................................................. 3 Limitations of JavaScript .................................................................................................................................. 3 JavaScript Development Tools......................................................................................................................... 3 Where is JavaScript Today? ............................................................................................................................. 4 2. JAVASCRIPT – Syntax ................................................................................................................................ 5 Your First JavaScript Code ............................................................................................................................... 5 Whitespace and Line Breaks ............................................................................................................................ 6 Semicolons are Optional.................................................................................................................................. 6 Case Sensitivity ................................................................................................................................................ 7 Comments in JavaScript .................................................................................................................................. 7 3. JAVASCRIPT – Enabling ............................................................................................................................. 9 JavaScript in Internet Explorer ........................................................................................................................ 9 JavaScript in Firefox ......................................................................................................................................... 9 JavaScript in Chrome ..................................................................................................................................... 10 JavaScript in Opera ........................................................................................................................................ 10 Warning for Non-JavaScript Browsers ........................................................................................................... 10 4. JAVASCRIPT – Placement ........................................................................................................................ 12 JavaScript in ... Section ......................................................................................................... 12 JavaScript in ... Section ......................................................................................................... 13 JavaScript in and Sections .................................................................................................... 13 JavaScript in External File .............................................................................................................................. 14 5. JAVASCRIPT – Variables .......................................................................................................................... 16 JavaScript Datatypes...................................................................................................................................... 16 JavaScript Variables ....................................................................................................................................... 16 JavaScript Variable Scope .............................................................................................................................. 17 JavaScript Variable Names ............................................................................................................................ 18 JavaScript Reserved Words ........................................................................................................................... 19 6. JAVASCRIPT – Operators ......................................................................................................................... 20 What is an Operator? .................................................................................................................................... 20 Arithmetic Operators..................................................................................................................................... 20 Comparison Operators .................................................................................................................................. 23 Logical Operators ........................................................................................................................................... 26 iii Bitwise Operators .......................................................................................................................................... 28 Assignment Operators ................................................................................................................................... 31 Miscellaneous Operators ............................................................................................................................... 34 7. JAVASCRIPT – If-Else ............................................................................................................................... 38 Flow Chart of if-else ....................................................................................................................................... 38 if Statement ................................................................................................................................................... 39 if...else Statement ......................................................................................................................................... 40 if...else if... Statement ................................................................................................................................... 41 8. JAVASCRIPT – Switch-Case ...................................................................................................................... 43 Flow Chart ..................................................................................................................................................... 43 9. JAVASCRIPT – While Loop ....................................................................................................................... 47 The while Loop .............................................................................................................................................. 47 The do...while Loop ....................................................................................................................................... 49 10. JAVASCRIPT – For Loop ........................................................................................................................... 52 The for Loop .................................................................................................................................................. 52 11. JAVASCRIPT – For-in Loop ....................................................................................................................... 55 12. JAVASCRIPT – Loop Control ..................................................................................................................... 57 The break Statement ..................................................................................................................................... 57 The continue Statement ................................................................................................................................ 59 Using Labels to Control the Flow ................................................................................................................... 60 13. JAVASCRIPT – Functions .......................................................................................................................... 64 Function Definition ........................................................................................................................................ 64 Calling a Function .......................................................................................................................................... 65 Function Parameters ..................................................................................................................................... 66 The return Statement .................................................................................................................................... 67 Nested Functions ........................................................................................................................................... 68 Function () Constructor ................................................................................................................................. 70 Function Literals ............................................................................................................................................ 71 14. JAVASCRIPT – Events............................................................................................................................... 74 What is an Event? .......................................................................................................................................... 74 onclick Event Type ......................................................................................................................................... 74 onsubmit Event Type ..................................................................................................................................... 75 onmouseover and onmouseout .................................................................................................................... 76 HTML 5 Standard Events ............................................................................................................................... 77 15. JAVASCRIPT – Cookies ............................................................................................................................. 82 What are Cookies?......................................................................................................................................... 82 How It Works? ............................................................................................................................................... 82 Storing Cookies .............................................................................................................................................. 83 Reading Cookies ............................................................................................................................................ 84 Setting Cookies Expiry Date ........................................................................................................................... 86 Deleting a Cookie ........................................................................................................................................... 87 iv 16. JAVASCRIPT – Page Redirect ................................................................................................................... 89 What is Page Redirection? ............................................................................................................................. 89 JavaScript Page Refresh ................................................................................................................................. 89 Auto Refresh .................................................................................................................................................. 89 How Page Re-direction Works? ..................................................................................................................... 90 17. JAVASCRIPT – Dialog Box ........................................................................................................................ 94 Alert Dialog Box ............................................................................................................................................. 94 Confirmation Dialog Box ................................................................................................................................ 95 Prompt Dialog Box ......................................................................................................................................... 96 18. JAVASCRIPT – Void Keyword ................................................................................................................... 98 19. JAVASCRIPT – Page Printing .................................................................................................................. 101 How to Print a Page? ................................................................................................................................... 102 PART 2: JAVASCRIPT OBJECTS ................................................................................................. 103 20. JAVASCRIPT – Objects ........................................................................................................................... 105 Object Properties......................................................................................................................................... 105 Object Methods ........................................................................................................................................... 105 User-Defined Objects .................................................................................................................................. 106 Defining Methods for an Object .................................................................................................................. 108 The ‘with’ Keyword ...................................................................................................................................... 109 21. JAVASCRIPT – Number .......................................................................................................................... 112 Number Properties ...................................................................................................................................... 112 MAX_VALUE ................................................................................................................................................ 113 MIN_VALUE ................................................................................................................................................. 114 NaN .............................................................................................................................................................. 115 NEGATIVE_INFINITY ..................................................................................................................................... 117 POSITIVE_INFINITY ...................................................................................................................................... 118 Prototype ..................................................................................................................................................... 119 constructor .................................................................................................................................................. 121 Number Methods ........................................................................................................................................ 121 toExponential () ........................................................................................................................................... 122 toFixed () ...................................................................................................................................................... 124 toLocaleString () .......................................................................................................................................... 125 toPrecision () ............................................................................................................................................... 126 toString () ..................................................................................................................................................... 127 valueOf () ..................................................................................................................................................... 128 22. JAVASCRIPT – Boolean .......................................................................................................................... 130 Boolean Properties ...................................................................................................................................... 130 constructor () ............................................................................................................................................... 130 Prototype ..................................................................................................................................................... 131 Boolean Methods ........................................................................................................................................ 132 toSource () ................................................................................................................................................... 133 toString () ..................................................................................................................................................... 134 valueOf () .....................................................................................................................................................
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