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Layered Boostrap Menu in Yii 2

I want my menu to have more than two levels. It seems that Yii 2 provides only up to 2 levels. For instance:

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();

does not display level 3 - x menu items. How to add additional levels to the menu?

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3 answers

This is not a limitation of Yii 2, a limitation of Boostrap 3.

Here is a quote from mdo (one of the main authors of Boostrap 3):

We did not see anyone who used the submenu in meaningful ways and the code needed to make them work well, too much overhead. Submenus simply do not have a lot of space on the Internet right now, especially the mobile network. They will be removed from 3.0.

.

. , .

.

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Nav.

0

1) Css /web/css/site.css

.dropdown-submenu {
    position: relative;
}
.dropdown-submenu>.dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -6px;
    margin-left: -1px;
    -webkit-border-radius: 0 6px 6px 6px;
    -moz-border-radius: 0 6px 6px;
    border-radius: 0 6px 6px 6px;
    min-width: 200px;
}
.dropdown-submenu:hover>.dropdown-menu {
    display: block;
}
.dropdown-submenu>a:after {
    display: block;
    content: " ";
    float: right;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 5px 0 5px 5px;
    border-left-color: #ccc;
    margin-top: 5px;
    margin-right: -10px;
}
.dropdown-submenu:hover>a:after {
    border-left-color: #fff;
}
.dropdown-submenu.pull-left {
    float: none;
}
.dropdown-submenu.pull-left>.dropdown-menu {
    left: -100%;
    margin-left: 10px;
    -webkit-border-radius: 6px 0 6px 6px;
    -moz-border-radius: 6px 0 6px 6px;
    border-radius: 6px 0 6px 6px;
}

2) "", "", "":

...
[
   'label' => 'Level 2 - 3',
   'itemsOptions'=>['class'=>'dropdown-submenu'],
   'submenuOptions'=>['class'=>'dropdown-menu'],
   'items' => [
        ['label' => 'Level 3 - 1', 'url' => '#'],
        ['label' => 'Level 3 - 2', 'url' => '#'],
    ],
],
....

3) ok!!

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