Bootstrap 3.0 Context Menu

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.min.css">
<table id="myTable" class="table table-hover">
    <thead>
        <tr>
            <th>#</th>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Username</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>1</td>
            <td>Mark</td>
            <td>Otto</td>
            <td class="username">@mdo</td>
        </tr>
        <tr>
            <td>2</td>
            <td>Jacob</td>
            <td>Thornton</td>
            <td class="username">@fat</td>
        </tr>
        <tr>
            <td>3</td>
            <td>Larry</td>
            <td>the Bird</td>
            <td class="username">@twitter</td>
        </tr>
    </tbody>
</table>

<ul id="contextMenu" class="dropdown-menu" role="menu" style="display:none" >
    <li><a tabindex="-1" href="#" value="menu1:action-1">Action</a></li>
    <li><a tabindex="-1" href="#" value="menu1:action-2">Another action</a></li>
    <li><a tabindex="-1" href="#" value="menu1:action-3">Something else here</a></li>
    <li class="divider"></li>
    <li><a tabindex="-1" href="#" value="action-4">Separated link</a></li>
</ul>
<ul id="contextMenuUsername" class="dropdown-menu" role="menu" style="display:none" >
    <li><a tabindex="-1" href="#" value="menu2:action-1">User action</a></li>
    <li><a tabindex="-1" href="#" value="menu2:action-2">Another user action</a></li>
</ul>



<!-- Post Info -->
<div style='position:fixed;bottom:0;left:0;    
            background:lightgray;width:100%;'>
    About this SO Question: <a href='http://stackoverflow.com/q/18666601/1366033'>Use Bootstrap 3 dropdown menu as context menu</a><br/>
<div>

JavaScript

(function ($, window) {
    var menus = {};
    $.fn.contextMenu = function (settings) {
        var $menu = $(settings.menuSelector);
        $menu.data("menuSelector", settings.menuSelector);
        if ($menu.length === 0) return;
        
        menus[settings.menuSelector] = {$menu: $menu, settings: settings};
        
        //make sure menu closes on any click
        $(document).click(function (e) {
            hideAll();
        });
        $(document).on("contextmenu", function (e) {
            var $ul = $(e.target).closest("ul");
            if ($ul.length === 0 || !$ul.data("menuSelector")) {
                hideAll();
            }
        });
        
        // Open context menu
        (function(element, menuSelector){
            element.on("contextmenu", function (e) {
                // return native menu if pressing control
                if (e.ctrlKey) return;
                
                hideAll();
                var menu = getMenu(menuSelector);
                
                //open menu
                menu.$menu
                .data("invokedOn", $(e.target))
                .show()
                .css({
                    position: "absolute",
                    left: getMenuPosition(e.clientX, 'width', 'scrollLeft'),
                    top: getMenuPosition(e.clientY, 'height', 'scrollTop')
                })
                .off('click')
                .on('click', 'a', function (e) {
                    menu.$menu.hide();
                    
                    var $invokedOn = menu.$menu.data("invokedOn");
                    var $selectedMenu = $(e.target);
                    
                    callOnMenuHide(menu);
                    menu.settings.menuSelected.call(this, $invokedOn, $selectedMenu);
                });
                
                callOnMenuShow(menu);
                return false;
            });
        })($(this), settings.menuSelector);

        function getMenu(menuSelector) {
          ...