jquery droppable widget

1. From the first box, we want to be able to drag and drop countries on to Countries box, and cities on to Cities box
2. If I try to drop a country on to the City box, or a city on to the Country box, it should not be allowed and the element should revert to it's original position

To achieve this we are going to make use of both draggable and droppable widgets

<%@ Page Language="C#" AutoEventWireup="true"
    CodeBehind="WebForm1.aspx.cs" Inherits="Demo.WebForm1" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="jquery-1.11.2.js"></script>
    <script src="jquery-ui.js"></script>
    <link href="jquery-ui.css" rel="stylesheet" />
    <script type="text/javascript">
        $(document).ready(function () {
            $('#source li').draggable({
                helper: 'clone',
                revert: 'invalid'
            });

            $('#divCountries').droppable({
                accept: 'li[data-value="country"]',
                drop: function (event, ui) {
                    $('#countries').append(ui.draggable);
                }
            });

            $('#divCities').droppable({
                accept: 'li[data-value="city"]',
                drop: function (event, ui) {
                    $('#cities').append(ui.draggable);
                }
            });
        });
    </script>
    <style>
        .divClass {
            border: 3px solid black;
            font-size: 25px;
            background-color: lightgray;
            width: 250px;
            padding: 5px;
            display: inline-table;
        }

        li {
            font-size: 20px;
        }
    </style>
</head>
<body style="font-family: Arial">
    <form id="form1" runat="server">
        <div class="divClass">
            Countries & Cities
                <ul id="source">
                    <li data-value="country">USA</li>
                    <li data-value="country">India</li>
                    <li data-value="country">UK</li>
                    <li data-value="city">New York</li>
                    <li data-value="city">Chennai</li>
                    <li data-value="city">London</li>
                </ul>
        </div>

        <div class="divClass" id="divCountries">
            Countries
            <ul id="countries"></ul>
        </div>

        <div class="divClass" id="divCities">
            Cities
            <ul id="cities"></ul>
        </div>
    </form>
</body>
</html>

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