JQuery form validation – How to remove special characters!

i was using a jquery form validation plugin and it was so easy in validating a form. I was stuck in a scenario where i want users to register userID and i dont want them to enter special characters like dots and just want them to enter alphabets, number and underscore in the username.

I went through the documentation of the plugin and there was no such methods to strip the special characters in the plugin.

Finally, i somehow got hold of the code that does the job through regular expression regex that checks for only numbers and a-z

  <script>
  $(document).ready(function(){

      $.validator.addMethod("noSpecialChars", function(value, element) {
        return this.optional(element) || /^[a-z0-9\_]+$/i.test(value);
    }, "Username must contain only letters, numbers, or underscore.");

    $("#myForm").validate();
  });
  </script>

All you have to do is call this function from the textbox element. Dont forget to check out the example of addMethod()

//call this from html code within class=required
<input id="cname" name="name" size="25" class="required noSpecialChars" minlength="2" />

Works like a charm!

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