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Include jQuery Locally What if you are working on a local computer and it’s not connected to the Internet? Sure enough you can add jQuery by including the framework file directly from a location off the root folder of your project. Just make sure the file is actually located there: project_root_folder/js/jquery-1.7.1.min.js 71
Including jQuery as an External CDN-based Files Let’s take a brief look at the basic properties of an externally included file: 1. An external file is a file that is separate from your main HTML file. 2. An external file can be hosted on the same host. In most cases, it is. It is not necessary, however, for an external file to be located on the same host as your web page. You can add an external JavaScript file from a separate website and it will still be included as part of your HTML page. The code will execute. The jQuery locations discussed on the previous page are hosted by Google, Microsoft and the jQuery project itself. They are offered in two flavors HTTP and HTTPS. The latter stands for a secure connection with SSL. The subject of the HTTP protocol and secure connections will not be discussed in this book. However, you must know about Relative URL References with regard to including jQuery from CDN locations using either the HTTP or HTTPS protocols. For various reasons you may be interested in including either HTTP or HTTPS version of the hosted file from one of the discussed CDNs. What is a relative reference? It allows us to include external file without mentioning the absolute location such as www.mywebsite.com/js/script.js. There are similar rules at work when choosing either HTTP or HTTPS protocols, too. Some pages on your website will be using the HTTP protocol. Others, HTTPS. In order for our page to include the right protocol automatically, and according to the HTML specification, we can use the double slash // symbol, as in: Notice the leading // symbol. It means the correctly matched protocol will be used. This is useful, because, for example, if you were forcing the fixed HTTPS protocol in an externally included file, on a web page that was itself using HTTP, you would encounter a “mixed content” security message. The // also helps us properly cache the file. Note that HTTPS can never be cached. The golden rule is whenever an external file is offered in HTTP and HTTPS flavors, use only the // when including it, instead of http:// or https:// This method can also improve page load speed in some cases. 72
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“ Second Revision. July 2012 Unde
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Prototype, JavaScript Objects and J
Page 5 and 6:
Thought transcends matter. When we
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Preface The purpose of this book is
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A Lesson in Creativity The web deve
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I love jQuery because it allows me
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Improving Page Load Performance The
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Determining the Placement of Intern
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JavaScript 1. The only language peo
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What is JavaScript? Web designers u
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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
Page 59 and 60: JavaScript from scratch. If you are
Page 61 and 62: property access operator - the . (d
Page 63 and 64: Why does jQuery do exactly the same
Page 65 and 66: Learning jQuery The greatest thing
Page 67 and 68: If this sounds like you, then you w
Page 69 and 70: Web App Initialization To initializ
Page 71 and 72: In JavaScript, we can define variab
Page 73 and 74: As mentioned above, to an experienc
Page 75: Including jQuery In Your Source Cod
Page 79 and 80: Including jQuery UI In the Starting
Page 81 and 82: What Kind of Elements Can You Selec
Page 83: To traverse the DOM and make sure t
Page 86 and 87: Here is a basic inline CSS example
Page 88 and 89: Because the DIV element has ID of
Page 90 and 91: After selecting all of these input
Page 92 and 93: Figure 1 Mentality of a beginner jQ
Page 94 and 95: Whose Children Are These? If we are
Page 96 and 97: Next, let’s explore the possibili
Page 98 and 99: jQuery Events Because jQuery is so
Page 100 and 101: Of course, the effects of binding a
Page 102 and 103: Using toggle() Events Toggling betw
Page 104 and 105: Speed Up Your jQuery Code jQuery is
Page 106 and 107: Let’s now look at the jQuery way
Page 108 and 109: Practical jQuery Lessons Instead of
Page 110 and 111: There is a solution to this problem
Page 112 and 113: jQuery provides a secondary way of
Page 114 and 115: Lesson 3: Callback Functions All jQ
Page 116 and 117: For example, the following statemen
Page 118 and 119: As you may know an object can conta
Page 120 and 121: Notice that when we do it this way,
Page 122 and 123: Alternatively, we can create the pa
Page 124 and 125: if (“light”.match(/darkness/) =
Page 126 and 127:
jQuery and Regular Expressions In p
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This is probably as simple as it ge
Page 130 and 131:
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
Page 142:
Note from the Author Looks like you
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