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

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70 CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS animation will complete before the second begins; the second will complete before the third begins, and so on. The specialEasing option allows developers to attach different easing styles to each CSS property being animated. ■ Note specialEasing is a new feature in jQuery 1.4 and the brainchild of James Padolsey. He posted a great example available at http://james.padolsey.com/demos/jquery/easing/easing-jq14.html. .delay() The .delay() method is new in jQuery 1.4 and essentially allows developers to pause a script’s execution for a given number of milliseconds. It provides the ability to run one animation and wait for a bit before starting the next animation. To slide up the paragraph with ID bar, wait 3 seconds, and slide it back down, use the following code: $("#bar") .css({ "background":"yellow", "border":"1px solid black" }) .slideUp(1000, function(){ console.log("Animation completed!"); }) .delay(3000) .slideDown(1000, function(){ console.log("Animation completed!"); }); .stop() To stop an animation, the .stop() method is used. This method accepts two Boolean argument: one to determine whether the queue should be cleared and another to determine whether the animation should jump to the end. Both values default to false. To start an animation, stop the animation, clear the queue, and jump to the end after 200 steps, use the following: var count = 0; // Keep track of the current step count $("#bar") .css({ "background":"yellow", "border":"1px solid black" }) .animate({ "width":"500px"
{ }, "duration":6000, "step":function(){ if(count++==200) { $(this).stop(true, true); } } }); Handling Events CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS In many scripts, it’s desirable to have certain actions occur when certain events, or browser actions, occur. Support is built into jQuery to handle browser events, which you’ll learn in this section. Browser Events Browser events occur when the browser itself experiences a change or error. .error() If a browser error occurs, this event is triggered. One common instance of a browser error would be an image tag that tries to load an image that does not exist. The .error() method allows developers to bind a handler (i.e., a function to be fired if the event occurs) to the event. Create an image tag that tries to display an image that doesn’t exist, and attach an error handler to the error event that outputs a message to the console: $("", { "src":"not/an/image.png", "alt":"This image does not exist" }) .error(function(){ console.log("The image cannot be loaded!"); }) .appendTo("body"); Upon execution of this code, the console will display the following: 71
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THE EXPERT’S VOICE ® IN OPEN SOU
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ii Pro PHP and jQuery Copyright ©
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iv Contents at a Glance ■About th
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vi ■ CONTENTS Understanding jQuer
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viii ■ CONTENTS Summary .........
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x ■ CONTENTS ■Chapter 9: Perfor
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xii About the Author ■ Jason Leng
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xiv Acknowledgments I feel like I s
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C H A P T E R 1 ■ ■ ■ Introdu
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CHAPTER 1 ■ INTRODUCING JQUERY Th
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SETTING UP A LOCAL TESTING ENVIRONM
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google.load("jquery", "1.4.2");
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Basic Selectors CHAPTER 1 ■ INTRO
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Only one paragraph in our document
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$(".foo+p"); CHAPTER 1 ■ INTRODUC
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$("p:odd"); [ p.foo, p#bar ] Select
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Page 103 and 104: C H A P T E R 3 ■ ■ ■ Object-
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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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