How to use JQuery Custom Validators and onChange Event in <input type='file' /> using ASP.NET MVC 3

Invoking custom jquery validator within another javascript function

How to invoke jQuery Custom Validator for a <input type='file' /> on onChange Event within normal javascript function. I need to capture the event and trigger a custom validator already registered, inside it creates a table with rows corresponding to each file attempted to upload. I have read this article but I can't validate what the author is saying: Version of Custom Validator Calling

Thanks in advance.

I have a piece of jquery custom validator function that makes the magic, it checks valid files extensions (images are the main target right now) when uploading them to the server:

$(document).ready(function () {
$('#UploadedFile').live('change', function () {
    //TODO
    alert('Hey hey!');//It works, because the event is captured and calls this line
    return jQuery.validator.methods.extensions.call(null, $(this), null);//Doesn't work for me

   //This is for running validation in the client-side      
});

});

jQuery.validator.addMethod("extensions", function (value, element, params) {
var extensionsAllowed = params.extensions;
var pattern = new RegExp(extensionsAllowed);
var elementToValidate = $(element);
var maxUploadSize = Math.floor(5000000 / 1024) / 1024;//converting to Kilobytes

var result = fnCreateUploadDetailsTable(elementToValidate, pattern, maxUploadSize);
return result;

   //It works for server-side Data Annotations validator, 
   //but the request travels over the HTTP connection and I want to avoid overloading the server
   //with this basic function
});

jQuery.validator.unobtrusive.adapters.add("extensions", ["extensions"], function (options) {
options.rules["extensions"] = options.params;
options.messages["extensions"] = options.message;
});