https://www.hiu.edu/js/bootstrap/js/twitter-bootstrap-hover-dropdown.js

1/*
2 * Project: Twitter Bootstrap Hover Dropdown
3 * Author: Cameron Spear
4 * Contributors: Mattia Larentis
5 *
6 * Dependencies?: Twitter Bootstrap's Dropdown plugin
7 *
8 * A simple plugin to enable twitter bootstrap dropdowns to active on hover and provide a nice user experience.
9 *
10 * No license, do what you want. I'd love credit or a shoutout, though.
11 *
12 * http://cameronspear.com/blog/twitter-bootstrap-dropdown-on-hover-plugin/
13 */
14;(function($, window, undefined) {
15    // outside the scope of the jQuery plugin to
16    // keep track of all dropdowns
17    var $allDropdowns = $();
18
19    // if instantlyCloseOthers is true, then it will instantly
20    // shut other nav items when a new one is hovered over
21    $.fn.dropdownHover = function(options) {
22
23        // the element we really care about
24        // is the dropdown-toggle's parent
25        $allDropdowns = $allDropdowns.add(this.parent());
26
27        return this.each(function() {
28            var $this = $(this).parent(),
29                defaults = {
30                    delay: 500,
31                    instantlyCloseOthers: true
32                },
33                data = {
34                    delay: $(this).data('delay'),
35                    instantlyCloseOthers: $(this).data('close-others')
36                },
37                options = $.extend(true, {}, defaults, options, data),
38                timeout;
39
40            $this.hover(function() {
41                if(options.instantlyCloseOthers === true)
42                    $allDropdowns.removeClass('open');
43
44                window.clearTimeout(timeout);
45                $(this).addClass('open');
46            }, function() {
47                timeout = window.setTimeout(function() {
48                    $this.removeClass('open');
49                }, options.delay);
50            });
51        });
52    };
53
54    $(document).ready(function() {
55        $('[data-hover="dropdown"]').dropdownHover();
56    });
57})(jQuery, this);