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

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C H A P T E R 9 ■ ■ ■ Performing Form Validation with Regular Expressions It’s your responsibility as a developer to ensure that your users’ data is useful to your app, so you need to ensure that critical information is validated before storing it in your database. In the case of the calendar application, the date format is critical: if the format isn’t correct, the app will fail in several places. To verify that only valid dates are allowed into the database, you’ll use regular expressions (regexes), which are powerful pattern-matching tools that allow developers much more control over data than a strict string comparison search. Before you can get started with adding validation to your application, you need to get comfortable using regular expressions. In the first section of this chapter, you’ll learn how to use the basic syntax of regexes. Then you’ll put regexes to work doing server-side and client-side validation. Getting Comfortable with Regular Expressions Regular expressions are often perceived as intimidating, difficult tools. In fact, regexes have such a bad reputation among programmers that discussions about them are often peppered with this quote: Some people, when confronted with a problem, think, “I know, I’ll use regular expressions.” Now they have two problems. —Jamie Zawinski This sentiment is not entirely unfounded because regular expressions come with a complex syntax and little margin for error. However, after overcoming the initial learning curve, regexes are an incredibly powerful tool with myriad applications in day-to-day programming. Understanding Basic Regular Expression Syntax In this book, you’ll learn Perl-Compatible Regular Expression (PCRE) syntax. This syntax is compatible with PHP and JavaScript, as well as most other programming languages. 311
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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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$("p:parent"); [ p, p.foo, p, p#bar
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which returns the following in the
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Selecting Only Enabled or Disabled
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26 CHAPTER 2 ■ COMMON JQUERY ACTI
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C H A P T E R 3 ■ ■ ■ Object-
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$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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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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Page 276 and 277: 260 CHAPTER 7 ■ ENHANCING THE USE
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Page 325: P A R T 4 ■ ■ ■ Advancing jQu
Page 329 and 330: * * Start by simply outputting the
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Page 341 and 342: CHAPTER 9 ■ PERFORMING FORM VALID
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Page 347 and 348: Figure 9-17. Expanding the validate
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Page 362 and 363: 346 CHAPTER 10 ■ EXTENDING JQUERY
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360 CHAPTER 10 ■ EXTENDING JQUERY
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362 ■ INDEX ■ A active class, 2
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364 ■ INDEX class.calendar.inc.ph
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366 ■ INDEX .not( ) method, 27 .p
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368 ■ INDEX array of event object
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370 ■ INDEX .hide( ) method, 65-6
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372 ■ INDEX login credentials cla
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374 ■ INDEX adding effects to, 25
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376 ■ INDEX setting in events cal
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378 ■ INDEX extracting query stri
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