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

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236 CHAPTER 7 ■ ENHANCING THE USER INTERFACE WITH JQUERY Setting Progressive Enhancement Goals Using the principles of progressive enhancement, you’ll add the ability to view event information without a page refresh in a modal window, a content area that sits on top of existing markup to display additional information. Such windows are usually triggered by JavaScript, and they are used on many of today’s most popular web sites. In your calendar application, you’ll use a modal window to display event details after a user clicks the event title. This will be done without a page refresh using AJAX. Include jQuery in the Calendar App As you learned in the introduction to jQuery earlier in this book, using jQuery syntax requires that you first include the jQuery library. Because JavaScript files should be the last thing in your HTML markup before you the close body tag (), you’ll include the jQuery library and all subsequent files in footer.inc.php (/public/assets/common/footer.inc.php). Begin by including the latest version of jQuery in your app; you accomplish this by adding the following bold lines to footer.inc.php: google.load("jquery", "1"); Save this code, then load http://localhost/ in your browser. Open the Firebug console and execute the following command to ensure that jQuery is loaded in your app: $("h2").text(); After running this command, the console will display the following output: >>> $("h2").text(); "January 2010" ■ Note Because you’re using the Google JSAPI, you need to have an Internet connection available, in addition to your Apache server. If you do not have access to an Internet connection or prefer not to use one, download the latest version of jQuery from http://jquery.com/ and include it instead.
Create a JavaScript Initialization File CHAPTER 7 ■ ENHANCING THE USER INTERFACE WITH JQUERY Your app is following progressive enhancement guidelines, so all scripts will be housed in an external file called init.js. It will reside in the public js folder (/public/assets/js/init.js), and it will contain all of the custom jQuery code for your app. Include the Initialization File in the Application Before any of your scripts will be available to your app, you will need to include the initialization file in the application. Your app will use jQuery syntax, so the initialization file needs to be included after the script that loads the jQuery library in footer.inc.php. You include the file in your app by inserting the following bold code into footer.inc.php: google.load("jquery", "1"); Ensuring the Document Is Ready Before Script Execution After creating init.js, use the document.ready shortcut from jQuery to ensure that no scripts execute before the document is actually ready to be manipulated. Insert the following code into init.js: // Makes sure the document is ready before executing scripts jQuery(function($){ // A quick check to make sure the script loaded properly console.log("init.js was loaded successfully."); }); Save this file and load http://localhost/ in your browser with the Firebug console open. After the file is loaded, you should see the following result appear in the console: init.js was loaded successfully. Creating a New Stylesheet for Elements Created by jQuery To ensure the elements created with jQuery look right when you start building them, you’re going to jump a bit ahead here and create a new CSS file to store styling information for the elements you’ll create with the jQuery scripts you’re about to write. 237
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THE EXPERT’S VOICE ® IN OPEN SOU
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ii Pro PHP and jQuery Copyright ©
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iv Contents at a Glance ■About th
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vi ■ CONTENTS Understanding jQuer
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viii ■ CONTENTS Summary .........
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x ■ CONTENTS ■Chapter 9: Perfor
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xii About the Author ■ Jason Leng
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xiv Acknowledgments I feel like I s
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C H A P T E R 1 ■ ■ ■ Introdu
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CHAPTER 1 ■ INTRODUCING JQUERY Th
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SETTING UP A LOCAL TESTING ENVIRONM
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google.load("jquery", "1.4.2");
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Basic Selectors CHAPTER 1 ■ INTRO
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Only one paragraph in our document
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$(".foo+p"); CHAPTER 1 ■ INTRODUC
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$("p:odd"); [ p.foo, p#bar ] Select
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$("p:parent"); [ p, p.foo, p, p#bar
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which returns the following in the
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Selecting Only Enabled or Disabled
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26 CHAPTER 2 ■ COMMON JQUERY ACTI
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C H A P T E R 3 ■ ■ ■ Object-
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$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 $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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168 CHAPTER 5 ■ ADD CONTROLS TO C
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286 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.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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