javascript - 下拉菜单 ... 带有 Bootstrap 的下拉菜单

Question

我需要在 Bootstrap 3 的下拉菜单中放置一个下拉菜单 ... .

不幸的是，当我点击第二个下拉菜单时，它没有显示。

如何在单击时显示第二个下拉菜单？那么我如何(使用 JS 或 jQuery)处理第二个下拉菜单的状态变化？

---

HTML:

<div class="navbar navbar-default navbar-fixed-top" role="navigation">
    <div class="container">
        <div>
            <ul class="nav navbar-nav">
                <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Settings<span class="caret"></span></a>

                    <ul class="dropdown-menu" role="menu">
                        <li><a href="#">Edit</a>
                        </li>
                        <li><a href="#">Delete</a>
                        </li>
                        <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Visible by friends<span class="caret"></span></a>

                            <ul class="dropdown-menu" role="menu">
                                <li><a href="#">Visible by friends</a>
                                </li>
                                <li><a href="#">Visible by me only</a>
                                </li>
                                <li><a href="#">Visible by anyone</a>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </li>
            </ul>
        </div>
    </div>
</div>

Answer 1

添加以下javascript:

$('ul.dropdown-menu [data-toggle=dropdown]').on('click', function(event) {
    // Avoid following the href location when clicking
    event.preventDefault(); 
    // Avoid having the menu to close when clicking
    event.stopPropagation(); 
    // If a menu is already open we close it
    $('ul.dropdown-menu [data-toggle=dropdown]').parent().removeClass('open');
    // opening the one you clicked on
    $(this).parent().addClass('open');
});

Demo可以看here .