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

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64 CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS The difference comes into play if you need to perform further processing after the call to .map() or .each(). For instance, if you wanted to append the tag name and index to each paragraph and the span with class foo as previously illustrated and then filter to just the span with class foo and change its background and text colors, you might try the following: $("p,.foo").map(function(index, ele){ $(this).append(" "+ele.tagName+" #"+index); }) .find("span.foo") .css({ "color":"red", "background":"yellow" }); After execution, the tag names and indices are appended, but the span doesn’t have any style changes applied. This happens because the elements are no longer referenced by the object returned from .map(). To get the preceding snippet to perform as expected, you must swap out the call to .map() for a call to.each(): $("p,.foo").each(function(index, ele){ $(this).append(" "+ele.tagName+" #"+index); }) .find("span.foo") .css({ "color":"red", "background":"yellow" }); Now, running the code produces the desired result (see Figure 2-20).
Figure 2-20. Using .each(), the expected results are produced Using Animation and Other Effects CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS One of the most exciting features of jQuery is its library of methods that allow for animation and special effects, which are all possible with plain JavaScript but are incredibly easy using jQuery. A traditional JavaScript approach is tricky and much more involved. ■ Note Because it’s difficult to show animations as static images, you’ll need to rely on your browser for an illustration of how these examples should look. For live demonstrations of the different animation effects, visit the jQuery API at http://api.jquery.com, and look up the individual method you wish to see demonstrated. .show() and .hide() The most basic effects functions are .show() and .hide(). When fired without a parameter, they simply add or remove display:none; from the element’s style attribute. Hide the paragraph with ID bar using the following: $("#bar").hide(); 65
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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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Page 33 and 34: $("p:odd"); [ p.foo, p#bar ] Select
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CHAPTER 3 ■ OBJECT-ORIENTED PROGR
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CHAPTER 3 ■ OBJECT-ORIENTED PROGR
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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 $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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168 CHAPTER 5 ■ ADD CONTROLS TO C
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200 CHAPTER 6 ■ PASSWORD PROTECTI
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P A R T 3 ■ ■ ■ Combining jQu
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236 CHAPTER 7 ■ ENHANCING THE USE
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264 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.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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