Customizing droppable widget

String: If set to "clone", then the element will be cloned and the clone will be dragged.
Function: A function that will return a DOMElement to use while dragging.

<%@ 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: function () {
                    return '<b><u>' + $(this).text() + '</b></u>';
                },
                revert: 'invalid'
            });

            $('#divCountries').droppable({
                accept: 'li[data-value="country"]',
                //over: function (event, ui) {
                //    $(this).addClass('highlight');
                //},
                //out: function (event, ui) {
                //    $(this).removeClass('highlight');
                //},
                //hoverClass: 'highlight',
                //activeClass: 'highlight',
                activate: function (event, ui) {
                    $(this).addClass('highlight');
                },
                deactivate: function (event, ui) {
                    $(this).removeClass('highlight');
                },
                drop: function (event, ui) {
                    $('#countries').append(ui.draggable);
                }
            });

            $('#divCities').droppable({
                accept: 'li[data-value="city"]',
                //over: function (event, ui) {
                //    $(this).addClass('highlight');
                //},
                //out: function (event, ui) {
                //    $(this).removeClass('highlight');
                //},
                //hoverClass: 'highlight',
                //activeClass: 'highlight',
                activate: function (event, ui) {
                    $(this).addClass('highlight');
                },
                deactivate: function (event, ui) {
                    $(this).removeClass('highlight');
                },
                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;
        }

        .highlight {
            background-color: green;
            color: white;
            border: 3px solid grey;
        }
    </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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