<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Validate US Zip Code in JavaScript</title>
</head>
<body>
<form>
<input id="txtZip" name="zip" type="text" /><br />
<input id="Button1" type="submit" value="Validate"
onclick="IsValidZipCode(this.form.zip.value)" />
<p>This sample is from <a href="http://www.devcurry.com" target="_blank">DevCurry.com</a></p>
</form>
</body>
</html>
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function IsValidZipCode(zip) {
var isValid = /^[0-9]{3}(?:-[0-9]{4})?$/.test(zip);
if (isValid)
alert('Valid ZipCode');
else {
alert('Invalid ZipCode');
}
}
Output
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