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

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328 CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS Figure 9-14. The completed regular expression ■ Tip The examples in this chapter go over the most common features of regular expressions, but they don’t cover everything that regexes have to offer. Jan Goyvaerts has put together a fantastic resource for learning all of the ins-and-outs of regexes, as well as some tools for testing them, at http://www.regular-expressions.info/. Adding Server-Side Date Validation Now that you have a basic understanding of regexes, you’re ready to start validating user input. For this app, you need to ensure that the date format is correct, so that the app doesn’t crash by attempting to parse a date that it can’t understand. You’ll begin by adding server-side validation. This is more of a fallback because later you’ll add validation with jQuery. However, you should never rely solely on JavaScript to validate user input because the user can easily turn off JavaScript support and therefore completely disable your JavaScript validation efforts. Defining the Regex Pattern to Validate Dates The first step toward implementing date validation is to define a regex pattern to match the desired format. The format the calendar app uses is YYYY-MM-DD HH:MM:SS. Setting up Test Data You need to modify regex.php with a valid date format and a few invalid formats, so you can test your pattern. Start by matching zero or more numeric characters with your regex pattern. Do this by making the following changes shown in bold:
Regular Expression Demo em { background-color: #FF0; border-top: 1px solid #000; border-bottom: 1px solid #000; } CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS 329
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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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264 CHAPTER 8 ■ EDITING THE CALEN
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Page 325: P A R T 4 ■ ■ ■ Advancing jQu
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