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

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246 CHAPTER 7 ■ ENHANCING THE USER INTERFACE WITH JQUERY Figure 7-1. Clicking an event title causes a modal window to appear USING AN OBJECT LITERAL FOR UTILITY FUNCTIONS Utility functions often come into play when writing applications. The more complex the app, the more likely it is that a large number of utility functions will exist for it, and the harder it is to keep those functions organized. One option for keeping utility functions organized is to use object literals. This allows developers to put the functions in one place or even to group functions according to their usage. Understanding Object Literals At its simplest, an object literal is a variable in JavaScript that is an empty set of curly braces, signifying an empty object literal: var obj = {}; You can add any number of values to the object literal using comma-separated name-value pairs:
var obj = { "name" : "Jason Lengstorf", "age" : "25" }; CHAPTER 7 ■ ENHANCING THE USER INTERFACE WITH JQUERY To access a value, simply append a dot (.) and the name of the property you wish to access: alert(obj.name); // alerts "Jason Lengstorf" What makes object literals so useful is that you can also store functions in them: var obj = { "func" : function() { alert("Object literals rule!"); } }; To call a function stored in an object literal, use the same syntax that you would to access a value; however, you must also include the parentheses at the end. Otherwise, JavaScript assumes you’re trying to store that function in another variable and simply returns it: obj.func(); // alerts "Object literals rule!" Functions in object literals can accept parameters, as well: var obj = { "func" : function(text){ alert(text); } }; obj.func("I'm a parameter!"); // alerts "I'm a parameter!" Object Literals vs. Procedural Programming Keeping functions organized in an object literal makes code more legible and—if the developer makes an effort to keep the functions abstract enough—can cut down on the time spent maintaining the code in the future because everything is compartmentalized and easy to find. That said, object literals are not always the best solution. In instances where you may be dealing with multiple objects, it can be better to use a full-on object-oriented approach. If hardly any scripting is required, an object literal may be overkill. At the end of the day, it’s up to you as a developer to decide what the best approach is for your project. Ultimately, it’s a matter of taste and comfort; you need to decide what makes your development process easiest. Retrieve and Display Event Information with AJAX Now that the modal window loads, it’s time to load the event information and display it. To do this, you’ll be using the $.ajax() method. Using the $.ajax() method, you will send data to a processing file (which you'll build in the next section) using the POST method, then insert the response into the modal window. 247
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THE EXPERT’S VOICE ® IN OPEN SOU
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ii Pro PHP and jQuery Copyright ©
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iv Contents at a Glance ■About th
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vi ■ CONTENTS Understanding jQuer
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viii ■ CONTENTS Summary .........
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x ■ CONTENTS ■Chapter 9: Perfor
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xii About the Author ■ Jason Leng
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xiv Acknowledgments I feel like I s
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C H A P T E R 1 ■ ■ ■ Introdu
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CHAPTER 1 ■ INTRODUCING JQUERY Th
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SETTING UP A LOCAL TESTING ENVIRONM
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google.load("jquery", "1.4.2");
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Basic Selectors CHAPTER 1 ■ INTRO
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Only one paragraph in our document
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$(".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 $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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168 CHAPTER 5 ■ ADD CONTROLS TO C
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Page 249: P A R T 3 ■ ■ ■ Combining jQu
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296 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.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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