twitter-bootstrap-3 - Yii2 中的多级引导菜单

Question

我希望我的菜单有 2 个以上的级别。看起来 Yii 2 最多只能渲染 2 个级别。例如这个:

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', 'url' => '#'],
                [
                    'label' => 'Level 2 - 3',
                    'items' => [
                        ['label' => 'Level 3 - 1', 'url' => '#'],
                        ['label' => 'Level 3 - 2', 'url' => '#'],
                    ],
                ],
            ]
        ],
    ],
]);

NavBar::end();

不会显示 Level 3 - x 菜单项。如何在菜单中添加更多级别？

Answer 1

这不是 Yii 2 的限制，而是 Boostrap 3 的限制。

这里引用自 mdo (Boostrap 3 的主要贡献者之一):

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法来使用更多级别。例如看看这个 extension .

还讨论了这个问题的更多细节和例子 here .