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

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18 CHAPTER 1 ■ INTRODUCING JQUERY documentation by a member of the development community. For more on this filter, see http://api.jquery.com/contains-selector. Selecting Elements That Contain a Certain Element If you need to select only elements that contain another element, you would use the :has() filter. This works similarly to :contains(), except it accepts an element name instead of a string of text: $("p:has(span)"); When executed in the console, this outputs the following: >>> $("p:has(span)"); [ p, p#bar ] Only paragraphs containing span elements are returned. Selecting Elements That Are Empty To find elements that are empty (meaning the element contains neither text nor any other elements), the :empty filter comes into play. In the HTML example you’re using, the only empty elements are not visible. Select them by looking for any empty element: $(":empty"); This outputs the following: >>> $(":empty"); [ script jsapi, script jquery.min.js, div#_firebugConsole ] Both the second script tag and the div are dynamically generated. The script tag comes from jQuery being loaded by the Google JSAPI, and the div comes from Firebug. Selecting Elements That Are Parents The opposite of :empty, :parent will only match elements that contain children, which can be either other elements, text, or both. Select all paragraphs that are parents using the following: $("p:parent"); Because all paragraphs in your sample HTML document contain text (and other elements in some cases), all paragraphs are returned in the result set:
$("p:parent"); [ p, p.foo, p, p#bar ] Visibility Filters CHAPTER 1 ■ INTRODUCING JQUERY Visibility filters, :hidden and :visible, will select elements that are, respectively, hidden and visible. Select all visible paragraphs like so: $("p:visible"); Because none of the elements in your HTML example are currently hidden, this returns the following result set: >>> $("p:visible"); [ p, p.foo, p, p#bar ] Attribute Filters Element attributes are also a great way to select elements. An attribute is anything in the element that further defines it (this includes the class, href, ID, or title attributes). For the following examples, you'll be accessing the class attribute. ■ Note Please bear in mind that it is faster (and better practice) to use ID (#id) and class (.class) selectors in production scripts whenever possible; the examples below are just to demonstrate the capabilities of the filter. Selecting Elements That Match an Attribute and Value To match elements that have a given attribute and value, enclose the attribute-value pair in square brackets ([]): [attribute=value] To select all elements with a class attribute of foo, execute the following in the console: $("[class=foo]"); This returns the following: >>> $("[class=foo]"); [ p.foo, span.foo ] 19
Page 1: THE EXPERT’S VOICE ® IN OPEN SOU
Page 4 and 5: ii Pro PHP and jQuery Copyright ©
Page 6 and 7: iv Contents at a Glance ■About th
Page 8 and 9: vi ■ CONTENTS Understanding jQuer
Page 10 and 11: viii ■ CONTENTS Summary .........
Page 12 and 13: x ■ CONTENTS ■Chapter 9: Perfor
Page 14 and 15: xii About the Author ■ Jason Leng
Page 16 and 17: xiv Acknowledgments I feel like I s
Page 19 and 20: C H A P T E R 1 ■ ■ ■ Introdu
Page 21 and 22: CHAPTER 1 ■ INTRODUCING JQUERY Th
Page 23 and 24: SETTING UP A LOCAL TESTING ENVIRONM
Page 25 and 26: google.load("jquery", "1.4.2");
Page 27 and 28: Basic Selectors CHAPTER 1 ■ INTRO
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Page 39: Selecting Only Enabled or Disabled
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C H A P T E R 3 ■ ■ ■ Object-
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$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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