Phone Number Validation : Validation : Form Control : JavaScript DHTML examples (example source code) Organized by topic






/*

JavaScript Unleashed, Third Edition

by Richard Wagner and R. Allen Wyke 



ISBN: 067231763X

Publisher Sams CopyRight 2000



*/





<html>

<head>

<title>Phone Number Validation</title>

<script language="JavaScript">

<!-- begin script



function validatePhone(areaCode,prefix,extension)

{

  //Assemble phone number

  var phoneNum = new String(areaCode + "-" + prefix + "-" + extension);

   

  //Create a regular expression pattern that searches for

  //phone numbers with an area code of: 828, 252, 704,919, 910, or 336

  var regExpObj = /(828|252|704|919|910|336)-\d\d\d-\d\d\d\d/;

   

  if(regExpObj.exec(phoneNum) == null)

  {

    alert(phoneNum + " does not contain a valid North Carolina area code!");

  }

  else

  {

    alert("Thank you for your order!");

  }

}

// end script-->

</script>

</head>

   

<body>

<center>

<h1>NC Sales Company</h1>

   

Thanks for your order.  Please provide us with your North

Carolina phone number so we can contact you if there are

any problems shipping your order.

   

<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">

<br><br>

<input type="button"

       value="Submit"

       onClick="validatePhone(area.value,

                              prefix.value,

                              extension.value)">

</form>

</center>

</body>

</html>


1. Form validation: Not Empty, Valid Radio, is Number, string length, EMail Address
2. Validate an input field with minimum and maximum values
3. Validate an field with a maximum number of characters
4. Creating Reusable Validation Code
5. Credit Card Validation
6. Money Format
7. Validating User Input
8. Validate email address
9. Validate a number
10. TextField input length validator
11. Password field validator
12. TextField validator: email, IP address and URL
13. Must be at least 3 characters and not more than 8
14. Only characters are allowed
15. Can be empty
16. Must be a valid email address
17. ComboBox(list box): Must be selected one
18. InputBox: value must be between 10 and 90
19. Not stop when the first failed validation is encountered
20. A CSS is used to highlight the fields which failed to validate
21. Need to select a file
22. A simple form with two passwords that must have the same value
23. Shows the usage of callback functions for checking a field
24. Javascript validation framework
25. Form validator library