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192 CHAPTER 5 ■ ADD CONTROLS TO CREATE, EDIT, AND DELETE EVENTS Figure 5-7. The Delete button as it appears on the full event view Creating a Method to Require Confirmation When a user clicks the Delete button, he is sent to a confirmation page that contains a form to make sure he really wants to delete the event. That form will be generated by a new public method in the Calendar class called confirmDelete(). This method confirms that an event should be deleted by performing the following actions: 1. Checks if the confirmation form was submitted and a valid token was passed. If so, go to Step 2. If not, go to Step 3. 2. Checks whether the button clicked was the Confirmation button. • If so, it deletes the event. • If not, it sends the user back out to the main calendar view. 3. It loads the event data and displays the confirmation form. You accomplish the preceding steps by adding the new method, shown in bold, to the Calendar class:
public function __construct($dbo=NULL, $useDate=NULL) {...} public function buildCalendar() {...} public function displayEvent($id) {...} public function displayForm() {...} public function processForm() {...} /** * Confirms that an event should be deleted and does so * * Upon clicking the button to delete an event, this * generates a confirmation box. If the user confirms, * this deletes the event from the database and sends the * user back out to the main calendar view. If the user * decides not to delete the event, they're sent back to * the main calendar view without deleting anything. * * @param int $id the event ID * @return mixed the form if confirming, void or error if deleting */ public function confirmDelete($id) { /* * Make sure an ID was passed */ if ( empty($id) ) { return NULL; } /* * Make sure the ID is an integer */ $id = preg_replace('/[^0-9]/', '', $id); /* * If the confirmation form was submitted and the form * has a valid token, check the form submission */ if ( isset($_POST['confirm_delete']) && $_POST['token']==$_SESSION['token'] ) { /* * If the deletion is confirmed, remove the event * from the database */ if ( $_POST['confirm_delete']=="Yes, Delete It" ) { $sql = "DELETE FROM `events` WHERE `event_id`=:id CHAPTER 5 ■ ADD CONTROLS TO CREATE, EDIT, AND DELETE EVENTS 193
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THE EXPERT’S VOICE ® IN OPEN SOU
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ii Pro PHP and jQuery Copyright ©
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iv Contents at a Glance ■About th
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vi ■ CONTENTS Understanding jQuer
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viii ■ CONTENTS Summary .........
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x ■ CONTENTS ■Chapter 9: Perfor
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xii About the Author ■ Jason Leng
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xiv Acknowledgments I feel like I s
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C H A P T E R 1 ■ ■ ■ Introdu
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CHAPTER 1 ■ INTRODUCING JQUERY Th
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SETTING UP A LOCAL TESTING ENVIRONM
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google.load("jquery", "1.4.2");
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Basic Selectors CHAPTER 1 ■ INTRO
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Only one paragraph in our document
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$(".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 $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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140 CHAPTER 4 ■ BUILD AN EVENTS C
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242 CHAPTER 7 ■ ENHANCING THE USE
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264 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.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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