twitter-bootstrap-3 – Yii 2中的多级Boostrap菜单

我希望我的菜单有超过2个级别.看起来Yii 2只能渲染2级.例如：

NavBar::begin();

echo Nav::widget([
    'options' => ['class' => 'navbar-nav navbar-right'],'items' => [
        [
            'label' => 'Level 1','items' => [
                ['label' => 'Level 2 - 1','url' => '#'],['label' => 'Level 2 - 2',[
                    'label' => 'Level 2 - 3','items' => [
                        ['label' => 'Level 3 - 1',['label' => 'Level 3 - 2',],]
        ],]);

NavBar::end();

不会显示Level 3 – x菜单项.如何在菜单中添加更多级别？

解决方法

这不是Yii 2的限制,它是Boostrap 3的限制.

以下是mdo(Boostrap 3主要贡献者之一)的引用：

We haven’t seen anyone using submenus in meaningful ways and the code
necessary to make them work well is just too much overhead. Submenus
just don’t have much of a place on the web right Now,especially the
mobile web. They will be removed with 3.0.

它取自here.

但是,您可以找到一些替代方案来使用更多级别.比如看看这个extension.

此问题也将在更多细节和示例here中进行讨论.