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Posted By

welancers on 08/15/12


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javascript username validate


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Validate Username using Javascript

 / Published in: JavaScript
 

Validate Username using Javascript. Pass the Username as argument to function. It allows to enter only letters, numbers and underscores.

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  1. function validateUsername(str) {
  2.     var error = "";
  3.     var illegalChars = /\W/; // allow letters, numbers, and underscores
  4.  
  5.     if (str == "") {
  6.         error = "&bull; Please enter Username<br>";
  7.     } else if ((str.length < 5) || (str.length > 15)) {
  8.         error = "&bull; Username must have 5-15 characters<br>";
  9.     } else if (illegalChars.test(str)) {
  10. 		error = "&bull; Please enter valid Username. Use only numbers and alphabets<br>";
  11.     } else {
  12.         error = "";
  13.     }
  14.     return error;
  15. }

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