You can easily validate a TextBox against a phone number format, in JavaScript, using Regular Expressions (RegEx):
| <script type=“text/javascript”> function FormValidate() { if(document.Form1.PhoneNumber.value.search(/\d{3}\-\d{3}\-\d{4}/)==-1) { alert(“The phone number you entered is not valid.\r\nPlease enter a phone number with the format xxx-xxx-xxxx.”); return false; } } </script> |
And the HTML markup that works with this script, is:
| <form name=“Form1” onsubmit=“return FormValidate()”> <input type=“text” size=“25” name=“PhoneNumber” /> <br /><br /> <input type=“submit” value=“Submit” /> </form> |
The RegEx can be modified so that you can validate any other phone number format. For example, to validate a phone number with the format xxx-xxxx, simply use the RegEx string /\d{3}-\d{4}/.
