Phone Number Validation : Validation « Form Control « JavaScript DHTML

Phone Number Validation

<title>Phone Number Validation</title>
<script language="JavaScript">
function validatePhone(areaCode,prefix,extension)
  var phoneNum = new String(areaCode + "-" + prefix + "-" + extension);
  var regExpObj = /(\d\d\d)-\d\d\d-\d\d\d\d/;
  if(regExpObj.exec(phoneNum) == null)
    alert(phoneNum + " does not contain a valid code!");
    alert("Thank you for your order!");
// end script-->
<h1>Phone Number Validation</h1>
<form name="form1">
Phone Number: 
<input type="text" size=3 maxlength=3 name="area">-
<input type="text" size=3 maxlength=3 name="prefix">-
<input type="text" size=4 maxlength=4 name="extension">
<input type="button" value="Submit" onClick="validatePhone(area.value, prefix.value, extension.value)">


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