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

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30 CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS [ span.foo ] .closest() The .closest() method is an easy way to find elements up the DOM tree, which is the nesting order of elements (a DOM tree relationship in your example is the span within a paragraph within the body element). For example, to find the closest paragraph to the span with class foo, run the following code snippet in the console: $("span.foo").closest("p"); This outputs the following: >>> $("span.foo").closest("p"); [ p#bar ] .find() Similar to the .children() method, the .find() method matches descendants of elements within the current set. The main difference between .find() and .children() is that .children() only checks one level down in the DOM tree, whereas .find() doesn’t care how deep the matched elements are. To demonstrate, select the body tag and then find any contained span elements using the following: $("body").find("span"); This results in both spans being returned: >>> $("body").find("span"); [ span, span.foo ] However, if you were to try the same thing using .children(), an empty result set is returned: >>> $("body").children("span"); [ ] .next(), .nextAll(), and .nextUntil() A trio of useful methods for finding the next sibling elements in a set is provided in .next(), .nextAll(), and .nextUntil(). The .next() method will find the next sibling element in the set for each of the elements in the original result set. To select a paragraph with class foo and then traverse to the next sibling element, execute the following code in the console:
$("p.foo").next(); This generates the following output: >>> $("p.foo").next(); [ p ] CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS A selector can be passed to .next() as well, which allows developers to determine which type of next sibling element should be matched: $("p.foo").next("#bar"); This returns an empty result set, since the next element does not have an ID of bar: >>> $("p.foo").next("#bar"); [ ] Because .next() returns only one element, a companion method was created that returns all next sibling elements, .nextAll(). To select all paragraphs after the paragraph with the class foo, use the following code: $(".foo").nextAll("p"); This returns the following result: >>> $(".foo").nextAll("p"); [ p, p#bar ] ■ Note The selector is optional in .nextAll(), as it is in .next(). The third method available for selecting next sibling elements is the .nextUntil() method. As its name suggests, this method will return all next elements until a selector is matched. It’s important to note that the element matched by the selector will not be included in the result set. To demonstrate this, select the paragraph with the class foo and use .nextUntil() with a selector of "#bar": $(".foo").nextUntil("#bar"); Only one paragraph is returned in the result set, and the paragraph with the ID of bar is not included: >>> $(".foo").nextUntil("#bar"); 31
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
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: $("p:parent"); [ p, p.foo, p, p#bar
Page 37 and 38: which returns the following in the
Page 39: Selecting Only Enabled or Disabled
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80 CHAPTER 2 ■ COMMON JQUERY ACTI
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C H A P T E R 3 ■ ■ ■ Object-
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$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 $_startDay; public function
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200 CHAPTER 6 ■ PASSWORD PROTECTI
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P A R T 3 ■ ■ ■ Combining jQu
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236 CHAPTER 7 ■ ENHANCING THE USE
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264 CHAPTER 8 ■ EDITING THE CALEN
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P A R T 4 ■ ■ ■ Advancing jQu
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312 CHAPTER 9 ■ PERFORMING FORM V
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C H A P T E R 10 ■ ■ ■ Extend
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$.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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