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

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12 CHAPTER 1 ■ INTRODUCING JQUERY Figure 1-4. The Firebug console after executing a command Selecting Tags by Class Name Just as quickly as you can select by tag type, you can select elements by their assigned class or classes. The syntax for this is the use the class name preceded by a period (.): .class Select all the elements with the class foo by executing the following snippet in the console: $(".foo"); After execution, the following will show up in the console: >>> $(".foo"); [ p.foo, span.foo ] Both a paragraph tag and a span are returned, since they both have the class foo. Selecting Elements by ID To select an element by its id attribute, the CSS syntax of the id preceded by a hash sign (#) is used. #id Match all elements with an ID of bar with the following: $("#bar");
Only one paragraph in our document has an id of "bar", as we see in the result: >>> $("#bar"); [ p#bar ] Combining Selectors for More-Precise Selection CHAPTER 1 ■ INTRODUCING JQUERY In some situations, it may be necessary to isolate only certain tags that correspond to a class, which is easy to do by combining tag type and class in your selector. Enter the following in the console to select only paragraph tags with the class foo: $("p.foo"); The results in the console confirm that the span was ignored, even though it has the class foo: >>> $("p.foo"); [p.foo] Using Multiple Selectors In the event that you need to access multiple elements, multiple selectors can be used to access all of those elements at once. For instance, if you wanted to select any paragraph tag with a class of foo or any element with an ID of bar, you would use the following: $("p.foo,#bar"); This returns elements that match at least one selector specified in |the string: >>> $("p.foo,#bar"); [ p.foo, p#bar ] Hierarchy Selectors Sometimes, it’s not enough to be able to select by element, class, or ID. There are points at which you’ll need to access elements contained within, next to, or after another element, such as removing an active class from all menu items except the one that was just clicked, grabbing all the list items out of the selected unordered list, or changing attributes on the wrapper element when a form item is selected. Selecting Descendant Elements Selecting descendant elements, which are elements contained within other elements, is done using the ancestor selector followed by a space and the descendant selector. ancestor descendent 13
Page 1: THE EXPERT’S VOICE ® IN OPEN SOU
Page 4 and 5: ii Pro PHP and jQuery Copyright ©
Page 6 and 7: iv Contents at a Glance ■About th
Page 8 and 9: vi ■ CONTENTS Understanding jQuer
Page 10 and 11: viii ■ CONTENTS Summary .........
Page 12 and 13: x ■ CONTENTS ■Chapter 9: Perfor
Page 14 and 15: xii About the Author ■ Jason Leng
Page 16 and 17: xiv Acknowledgments I feel like I s
Page 19 and 20: C H A P T E R 1 ■ ■ ■ Introdu
Page 21 and 22: CHAPTER 1 ■ INTRODUCING JQUERY Th
Page 23 and 24: SETTING UP A LOCAL TESTING ENVIRONM
Page 25 and 26: google.load("jquery", "1.4.2");
Page 27: Basic Selectors CHAPTER 1 ■ INTRO
Page 31 and 32: $(".foo+p"); CHAPTER 1 ■ INTRODUC
Page 33 and 34: $("p:odd"); [ p.foo, p#bar ] Select
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Page 37 and 38: which returns the following in the
Page 39: Selecting Only Enabled or Disabled
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C H A P T E R 3 ■ ■ ■ Object-
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$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 $_startDay; public function
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138 CHAPTER 4 ■ BUILD AN EVENTS C
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168 CHAPTER 5 ■ ADD CONTROLS TO C
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200 CHAPTER 6 ■ PASSWORD PROTECTI
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P A R T 3 ■ ■ ■ Combining jQu
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236 CHAPTER 7 ■ ENHANCING THE USE
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264 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.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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