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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 18-2 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 18-2 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; 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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre><script src="Validate.js"></script> <!-- include form validation module --><style>/* * Validate.js requires us to define styles for the "invalid" class to give * invalid fields a distinct visual appearance that the user will recognize. * We can optionally define styles for valid fields as well. */input.invalid { background: #faa; } /* Reddish background for invalid fields */input.valid { background: #afa; } /* Greenish background for valid fields */</style><!-- Now to get form fields validated, simply set required or pattern attributes.--><form> <!-- A value (anything other than whitespace) is required in this field --> Name: <input type="text" name="name" required><br> <!-- \s* means optional space. \w+ means one or more alphanumeric chars--> email: <input type="text" name="email" pattern="^\s*\w+@\w+\.\w+\s*$"><br> <!-- \d{5} means exactly five digits --> zipcode: <input type="text" name="zip" pattern="^\s*\d{5}\s*$"><br> <!-- no validation on this field --> unvalidated: <input type="text"><br> <input type="submit"></form></pre><div class="lefttitle" style="padding:0px; 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