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

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248 CHAPTER 7 ■ ENHANCING THE USER INTERFACE WITH JQUERY Creating a File to Handle AJAX Requests Before you put together the call to $.ajax(), it helps to know where and how the data should be sent. In the inc folder, create a new file called ajax.inc.php (/public/assets/inc/ajax.inc.php). This file will work very similarly to process.inc.php, except it will deal exclusively with AJAX calls. Because a value returned from a PHP function can’t be read by JavaScript unless the value is actually output (using echo or its ilk), process.inc.php will not function properly for this aspect of the application. Essentially, ajax.inc.php will use a lookup array to determine which objects and methods need to be used, then output the returned values using echo for use with AJAX. Start by enabling sessions, loading the necessary configuration information, defining a constant, and putting together an auto-load function. Now add the following to ajax.inc.php: Next, define the lookup array with information for loading event data, then put together the code that will instantiate an object, call the method, and output the returned value using the bold code that follows:
* * Enable sessions */ session_start(); /* * Include necessary files */ include_once '../../../sys/config/db-cred.inc.php'; /* * Define constants for config info */ foreach ( $C as $name => $val ) { define($name, $val); } /* * Create a lookup array for form actions */ $actions = array( 'event_view' => array( 'object' => 'Calendar', 'method' => 'displayEvent' ) ); /* * Make sure the anti-CSRF token was passed and that the * requested action exists in the lookup array */ if ( isset($actions[$_POST['action']]) ) { $use_array = $actions[$_POST['action']]; $obj = new $use_array['object']($dbo); } /* * Check for an ID and sanitize it if found */ if ( isset($_POST['event_id']) ) { $id = (int) $_POST['event_id']; } else { $id = NULL; } echo $obj->$use_array['method']($id); function __autoload($class_name) { CHAPTER 7 ■ ENHANCING THE USER INTERFACE WITH JQUERY 249
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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 $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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168 CHAPTER 5 ■ ADD CONTROLS TO C
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Page 249: P A R T 3 ■ ■ ■ Combining jQu
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298 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.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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