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60 CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS Add the class baz and remove the class foo from the second paragraph in the example page using the following code: $("p.foo").toggleClass("foo baz"); Upon execution, the paragraph is modified and appears with the old class removed and the new one added (see Figure 2-17). Figure 2-17. The foo class is removed, and the baz class is added. To revert to the original class of foo and remove baz, select the paragraph, and apply .toggleClass() again: $("p.baz").toggleClass("foo baz"); This results in the paragraph going back to having only one class: foo. .hasClass() The .hasClass() method works similarly to the .is() method in that it determines if a class exists on a selected element and then returns either true or false. This makes it ideal for callback functions. Check if the first paragraph has class foo, and conditionally output a message using the following: var msg = $("p:eq(1)").hasClass("foo") ? "Found!" : "Nope!"; console.log("Class? "+msg);
.height() and .width() CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS To obtain the height or width of an element, the .height() and .width() methods are handy. Both return a value without units, meaning the value returned is an integer (if the element is 68 pixels high, .height() will return 68). This differs from .css(), which will return the units of measure as well. Get the height of the form by running the following code: console.log("Form height: "+$("form").height()+"px"); This outputs the following in the console: >>> console.log("Form height: "+$("form").height()+"px"); Form height: 238px ■ Note The actual height returned may vary on your browser depending on which operating system you’re using. By passing a value to .height() or .width(), a new value is set. Make all paragraphs on the page 100 pixels high with a yellow background using the following code: $("p").height(100).css("background","yellow"); Upon execution, all paragraph heights change and their backgrounds become yellow (see Figure 2-18). Figure 2-18. The modified height and backgrounds of all document paragraphs 61
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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
Page 25 and 26: google.load("jquery", "1.4.2");
Page 27 and 28: Basic Selectors CHAPTER 1 ■ INTRO
Page 29 and 30: Only one paragraph in our document
Page 31 and 32: $(".foo+p"); CHAPTER 1 ■ INTRODUC
Page 33 and 34: $("p:odd"); [ p.foo, p#bar ] Select
Page 35 and 36: $("p:parent"); [ p, p.foo, p, p#bar
Page 37 and 38: which returns the following in the
Page 39: Selecting Only Enabled or Disabled
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Page 103 and 104: C H A P T E R 3 ■ ■ ■ Object-
Page 105 and 106: $obj = new MyClass; var_dump($obj);
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Page 111 and 112: $obj = new MyClass; // Get the valu
Page 113 and 114: } public function setProperty($newv
Page 117 and 118: } } return $this->getProperty(); pu
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*/ CHAPTER 3 ■ OBJECT-ORIENTED PR
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Ease of Implementation CHAPTER 3
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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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