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Introduction What’s an educational book anyway? Any educational book is like an airport runway. It’s gets you somewhere. After reading this book you will be ready to continue experimenting with new knowledge and discover things that are not even mentioned in the book itself. I believe the function of any educational material is to give direction. The soul of a book can be found in the content it will encompass. Choosing the content for this book has been a tremendously time consuming task. Designed as a tool for education this book gives you enough information to move you forward and become a better JavaScript programmer and web designer. Even though very simple examples are used throughout the length of this book, it does not mean that this book has no value to someone with an advanced understanding of JavaScript. Simple tutorials are much more potent than elaborate ones. This book is for anyone who wants to learn jQuery and JavaScript. It is also an invitation to start taking a look at things from a slightly different perspective. I believe programmers of any skill level will find this book useful. Visual diagrams presented throughout the book are designed to help you memorize important concepts and in the end, reach the kind of understanding that would make you comfortable with creating your own dynamic websites and web applications. You can’t please everyone. But when making this book I believed that it was possible to make an intelligent attempt at creating a book which would be useful to beginners and experienced programmers, without having to make a big compromise. For this reason, while writing this book I have developed something I now refer to as the mirror technique. The Mirror Technique 1. Simple subjects will be explained in great detail. 2. Difficult subjects will be explained in intentionally simplified language. The requirement of learning JavaScript consists of understanding simple but also complex subjects. The mirror technique is a set of two rules with regard to complexity of material. Sticking to this logic, I managed to keep the content of this book neutral and increase audience appeal. This way everyone gets a little of everything and the book remains in a neutral zone. Still, it’s probably fair to say that this book is best suited for beginner-to-intermediate level programmers. I try to create a balance, but this is the group that will find this book helpful the most. In addition, over the years it has become apparent to me that most people who are looking for computer tutorials are beginners. So it’s wise to put a little more emphasis on writing for that group in particular. 3
A Lesson in Creativity The web developer is responsible not only for writing code, but understanding the structure of the entire web application. Part of the creative process is understanding web application composition. The HTML, CSS and JavaScript files that go into a website. When it comes to creating a great work of art, whether it’s a website, an interactive computer simulation, a game, or anything that has to do with any programming language, the language itself is only half of the story. This is why it’s so important to be able to integrate yourself into this creative process rather than thinking in terms of writing the code. If you want to create extraordinary things, just understanding jQuery won’t matter. What will matter is how creative you are at finding new ways of putting things together. Knowing the basics of web application composition is also very important. I made this animation to demonstrate how little jQuery and JavaScript code is required to create something interesting. View this demo online: www.learnjquery.org/demos/3d-css.html Don’t worry if you don’t understand rendering using 3D CSS. We will cover 3D CSS later on in the book. But as you can see, interesting things can be made with little jQuery code. Study the composition of this application. If you don’t understand how that code works yet, no problem! This is what the rest of this book is all about. 4
Page 1 and 2: “ Second Revision. July 2012 Unde
Page 3 and 4: Prototype, JavaScript Objects and J
Page 5 and 6: Thought transcends matter. When we
Page 7: Preface The purpose of this book is
Page 11 and 12: I love jQuery because it allows me
Page 13 and 14: Improving Page Load Performance The
Page 15 and 16: Determining the Placement of Intern
Page 17 and 18: JavaScript 1. The only language peo
Page 19 and 20: What is JavaScript? Web designers u
Page 21 and 22: As you can see, variables can be as
Page 23 and 24: The example above will first execut
Page 25 and 26: Only variables and events should be
Page 27 and 28: Notice that variables a and b are c
Page 29 and 30: What Exactly is a JavaScript Variab
Page 31 and 32: A variable allocates enough data st
Page 33 and 34: Do you want to really understand pr
Page 35 and 36: What is a Variable? Variables can b
Page 37 and 38: In order to understand bitwise logi
Page 39 and 40: At first this might seem confusing.
Page 41 and 42: Let’s display the variable “a
Page 43 and 44: What’s important is the return va
Page 45 and 46: Inserting Form Values into MySQL Da
Page 47 and 48: I like code that you can “read”
Page 49 and 50: An object is created from a class.
Page 51 and 52: Dynamic Prototype-based Objects in
Page 53 and 54: Without knowing anything at all abo
Page 55 and 56: More About JSON JSON is a data inte
Page 57 and 58: In some programming languages the t
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JavaScript from scratch. If you are
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property access operator - the . (d
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Why does jQuery do exactly the same
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Learning jQuery The greatest thing
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If this sounds like you, then you w
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Web App Initialization To initializ
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In JavaScript, we can define variab
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As mentioned above, to an experienc
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Including jQuery In Your Source Cod
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Including jQuery as an External CDN
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Including jQuery UI In the Starting
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What Kind of Elements Can You Selec
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To traverse the DOM and make sure t
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Here is a basic inline CSS example
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Because the DIV element has ID of
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After selecting all of these input
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Figure 1 Mentality of a beginner jQ
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Whose Children Are These? If we are
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Next, let’s explore the possibili
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jQuery Events Because jQuery is so
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Of course, the effects of binding a
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Using toggle() Events Toggling betw
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Speed Up Your jQuery Code jQuery is
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Let’s now look at the jQuery way
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Practical jQuery Lessons Instead of
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There is a solution to this problem
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jQuery provides a secondary way of
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Lesson 3: Callback Functions All jQ
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For example, the following statemen
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As you may know an object can conta
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Notice that when we do it this way,
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Alternatively, we can create the pa
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if (“light”.match(/darkness/) =
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jQuery and Regular Expressions In p
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This is probably as simple as it ge
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The following example will demonstr
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Making Good CSS Buttons This tutori
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Sometimes it makes sense to make th
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1. Specify javascript: return false
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Our goal is to match the button wit
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So far, we have briefly discussed t
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Note from the Author Looks like you
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