Pro PHP and jQuery by Jason Lengstorf.pdf - Computer Science ...

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8 CHAPTER 1 ■ INTRODUCING JQUERY Including a Remotely Hosted Copy of the jQuery Library The second option is to include a copy of the jQuery library hosted on Google Code. This is done in the hopes that visitors to your web site will have a copy of the library already cached from another site including the same file, which decreases load time for your site’s users. The remote copy is included just like the downloaded copy: Using the Google AJAX Libraries API Google Code also offers an option for loading jQuery called the AJAX Libraries API (see http://code.google.com/apis/ajaxlibs). In Google’s words, “The AJAX Libraries API is a content distribution network and loading architecture for the most popular, open source JavaScript libraries.” Using the AJAX Libraries API is simple and straightforward, and this is method that will be used throughout this book. To include jQuery in your web site using the AJAX Libraries API, use the following snippet: google.load("jquery", "1.4.2"); Setting up a Test File Now that your testing environment is set up, create a new folder in the htdocs folder within your XAMPP installation called testing, and create a new file inside it called index.html. In the editor of your choice, insert the following HTML markup: Testing jQuery Hello World! Another paragraph, but this one has a class. This is a span inside a paragraph. Paragraph with an id. And this sentence is in a span.
google.load("jquery", "1.4.2"); CHAPTER 1 ■ INTRODUCING JQUERY ■ Note Loading the JavaScript right before the closing body tag () is done to keep the scripts from blocking other page elements, such as images, from loading. Doing so also prevents JavaScript from running before the elements are fully loaded on the page, which can result in unexpected behavior or JavaScript errors. Save this file and navigate to http://localhost/testing/ in Firefox (see Figure 1-3). Figure 1-3. Our test file loaded in Firefox You’ll be using this file to get your feet wet with the basic operations of jQuery. Introducing the jQuery Function ($) At the core of jQuery is the jQuery function. This function is the heart and soul of jQuery and is used in every instance where jQuery is implemented. In most implementations of jQuery, the shortcut $() is used instead of jQuery() to keep the code concise. We won’t get too deep into the programming theory that makes this function tick, but it basically creates a jQuery object and evaluates the expression passed as its parameters. It then determines how it should respond and modifies itself accordingly. 9
Page 1: THE EXPERT’S VOICE ® IN OPEN SOU
Page 4 and 5: ii Pro PHP and jQuery Copyright ©
Page 6 and 7: iv Contents at a Glance ■About th
Page 8 and 9: vi ■ CONTENTS Understanding jQuer
Page 10 and 11: viii ■ CONTENTS Summary .........
Page 12 and 13: x ■ CONTENTS ■Chapter 9: Perfor
Page 14 and 15: xii About the Author ■ Jason Leng
Page 16 and 17: xiv Acknowledgments I feel like I s
Page 19 and 20: C H A P T E R 1 ■ ■ ■ Introdu
Page 21 and 22: CHAPTER 1 ■ INTRODUCING JQUERY Th
Page 23: SETTING UP A LOCAL TESTING ENVIRONM
Page 27 and 28: Basic Selectors CHAPTER 1 ■ INTRO
Page 29 and 30: Only one paragraph in our document
Page 31 and 32: $(".foo+p"); CHAPTER 1 ■ INTRODUC
Page 33 and 34: $("p:odd"); [ p.foo, p#bar ] Select
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Page 39: Selecting Only Enabled or Disabled
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C H A P T E R 3 ■ ■ ■ Object-
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$obj = new MyClass; var_dump($obj);
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CHAPTER 3 ■ OBJECT-ORIENTED PROGR
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$obj = new MyClass; // Get the valu
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} public function setProperty($newv
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} } return $this->getProperty(); pu
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Create a new object $newobj = new M
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} } // Create a new object $newobj
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Private Properties and Methods CHAP
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} public function __construct() { e
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*/ CHAPTER 3 ■ OBJECT-ORIENTED PR
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Ease of Implementation CHAPTER 3
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C H A P T E R 4 ■ ■ ■ Build a
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CHAPTER 4 ■ BUILD AN EVENTS CALEN
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# # DocumentRoot: The directory out
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CHAPTER 4 ■ BUILD AN EVENTS CALEN
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} ?> } } } CHAPTER 4 ■ BUILD AN E
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■ Note For the sake of brevity, D
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} ?> CHAPTER 4 ■ BUILD AN EVENTS
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} ?> } include_once $filename; CHAP
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private $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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P A R T 3 ■ ■ ■ Combining jQu
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236 CHAPTER 7 ■ ENHANCING THE USE
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264 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.validDate = function(date, option
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Modifying the Initialization Script
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Adding Methods to jQuery CHAPTER 10
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over, then returns it to its origin
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CHAPTER 10■ EXTENDING JQUERY ■
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Defines default values for the plug
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}); // Loads the event data from th
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■ ■ ■ Index ■ Special Chara
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■ C Calendar app JavaScript initi
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saving new calendar events in addin
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:eq( ) method, 17, 20, 26-27 equals
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eginning of string, 324 character c
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asic selectors in by class name, 12
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.die( ) method, 75-76 .error( ) met
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.parents( ) method, 33 .parentsUnti
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overview, 328 regex pattern to vali
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