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Validte a telephone number.

/ Published in: JavaScript
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The following JavaScript will validate if a 10 digit phone number was supplied once the form is submitted.

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Copy this code and paste it in your HTML 
  1. <head>
  2.  
  3. ...
  4.  
  5. <script language="JavaScript" type="text/javascript">
  6. function nameCheck() {
  7. }
  8. function teleCheck(teleStr) {
  9. alert(teleStr);
  10.     var stripped = teleStr.replace(/[\(\)\.\-\ ]/g, '');   
  11.     if (teleStr == "") {
  12.         alert("You must supply a phone number.");
  13.         return false;
  14.     } else if (isNaN(parseInt(stripped))) {
  15.         alert("The supplied phone number contains illegal characters.");
  16.         return false;
  17.     } else if (!(stripped.length == 10)) {
  18.         alert("Supplied phone number is the wrong length.\nBe sure to included an area code.");
  19.         return false;
  20.     }
  21.     return true;
  22. }
  23. </script>
  24.  
  25. ...
  26.  
  27. </head>
  28.  
  29. ...
  30.  
  31. <body>
  32.  
  33. ...
  34.  
  35. <form id="form1" name="form1" method="post" onSubmit="return teleCheck(this.telephone.value)" action="">
  36.  
  37. ...

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