javascript - 如何使用 html、css、bootstrap 在下拉列表中创建事件元素

Question

我提供了一个片段，但是输出与 here 不同所以请小心。我正在努力实现:

1. 当用户点击“主页”下的“主页 1”时，它将成为一个事件元素
2. 此外，当用户点击“Home 2”时，“Home 1”将处于非事件状态，而“Home 2”将成为事件元素

“页面”下拉列表也是如此。我可以知道解决方案是什么吗？

/*
    DEMO STYLE
*/

@import "https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700";

body {
    font-family: 'Poppins', sans-serif;
    background: #fafafa;
}

p {
    font-family: 'Poppins', sans-serif;
    font-size: 1.1em;
    font-weight: 300;
    line-height: 1.7em;
    color: #999;
}

a,
a:hover,
a:focus {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s;
}

.navbar {
    padding: 15px 10px;
    background: #fff;
    border: none;
    border-radius: 0;
    margin-bottom: 40px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar-btn {
    box-shadow: none;
    outline: none !important;
    border: none;
}

.line {
    width: 100%;
    height: 1px;
    border-bottom: 1px dashed #ddd;
    margin: 40px 0;
}

i,
span {
    display: inline-block;
}

/* ---------------------------------------------------
    SIDEBAR STYLE
----------------------------------------------------- */

.wrapper {
    display: flex;
    align-items: stretch;
}

#sidebar {
    min-width: 250px;
    max-width: 250px;
    background: #7386D5;
    color: #fff;
    transition: all 0.3s;
}

    #sidebar.active {
        min-width: 80px;
        max-width: 80px;
        text-align: center;
    }

        #sidebar.active .sidebar-header h3,
        #sidebar.active .CTAs {
            display: none;
        }

        #sidebar.active .sidebar-header strong {
            display: block;
        }

    #sidebar ul li a {
        text-align: left;
    }

    #sidebar.active ul li a {
        padding: 20px 10px;
        text-align: center;
        font-size: 0.85em;
    }

        #sidebar.active ul li a i {
            margin-right: 0;
            display: block;
            font-size: 1.8em;
            margin-bottom: 5px;
        }

    #sidebar.active ul ul a {
        padding: 10px !important;
    }

    #sidebar.active .dropdown-toggle::after {
        top: auto;
        bottom: 10px;
        right: 50%;
        -webkit-transform: translateX(50%);
        -ms-transform: translateX(50%);
        transform: translateX(50%);
    }

    #sidebar .sidebar-header {
        padding: 20px;
        background: #6d7fcc;
    }

        #sidebar .sidebar-header strong {
            display: none;
            font-size: 1.8em;
        }

    #sidebar ul.components {
        padding: 20px 0;
        border-bottom: 1px solid #47748b;
    }

    #sidebar ul li a {
        padding: 10px;
        font-size: 1.1em;
        display: block;
    }

        #sidebar ul li a:hover {
            color: #7386D5;
            background: #fff;
        }

        #sidebar ul li a i {
            margin-right: 10px;
        }

    #sidebar ul li.active > a,
    a[aria-expanded="true"] {
        color: #6d7fcc;
        background: #fff;
    }

a[data-toggle="collapse"] {
    position: relative;
}

.dropdown-toggle::after {
    display: block;
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
}

ul ul a {
    font-size: 0.9em !important;
    padding-left: 30px !important;
    background: #6d7fcc;
}

ul.CTAs {
    padding: 20px;
}

    ul.CTAs a {
        text-align: center;
        font-size: 0.9em !important;
        display: block;
        border-radius: 5px;
        margin-bottom: 5px;
    }

a.download {
    background: #fff;
    color: #7386D5;
}

a.article,
a.article:hover {
    background: #6d7fcc !important;
    color: #fff !important;
}

/* ---------------------------------------------------
    CONTENT STYLE
----------------------------------------------------- */

#content {
    width: 100%;
    padding: 20px;
    min-height: 100vh;
    transition: all 0.3s;
}

/* ---------------------------------------------------
    MEDIAQUERIES
----------------------------------------------------- */

@media (max-width: 768px) {
    #sidebar {
        min-width: 80px;
        max-width: 80px;
        text-align: center;
        margin-left: -80px !important;
    }

    .dropdown-toggle::after {
        top: auto;
        bottom: 10px;
        right: 50%;
        -webkit-transform: translateX(50%);
        -ms-transform: translateX(50%);
        transform: translateX(50%);
    }

    #sidebar.active {
        margin-left: 0 !important;
    }

    #sidebar .sidebar-header h3,
    #sidebar .CTAs {
        display: none;
    }

    #sidebar .sidebar-header strong {
        display: block;
    }

    #sidebar ul li a {
        padding: 20px 10px;
    }

        #sidebar ul li a span {
            font-size: 0.85em;
        }

        #sidebar ul li a i {
            margin-right: 0;
            display: block;
        }

    #sidebar ul ul a {
        padding: 10px !important;
    }

    #sidebar ul li a i {
        font-size: 1.3em;
    }

    #sidebar {
        margin-left: 0;
    }

    #sidebarCollapse span {
        display: none;
    }
}

<html>
<head>
    <script src="https://code.jquery.com/jquery-3.3.1.js"></script>

    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" />
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>

    <script src="https://use.fontawesome.com/releases/v5.5.0/js/all.js"></script>
</head>

<body>
    <div class="wrapper">
        <!-- Sidebar  -->
        <nav id="sidebar">
            <div class="sidebar-header">
                <h3>Bootstrap Sidebar</h3>
                <strong>BS</strong>
            </div>

            <ul class="list-unstyled components">
                <li>
                    <a href="#homeSubmenu" data-toggle="collapse" aria-expanded="false" class="dropdown-toggle">
                        <i class="fas fa-home"></i>
                        Home
                    </a>
                    <ul class="collapse list-unstyled" id="homeSubmenu">
                        <li>
                            <a href="#">Home 1</a>
                        </li>
                        <li>
                            <a href="#">Home 2</a>
                        </li>
                        <li>
                            <a href="#">Home 3</a>
                        </li>
                    </ul>
                </li>
                <li>
                    <a href="#pageSubmenu" data-toggle="collapse" aria-expanded="false" class="dropdown-toggle">
                        <i class="fas fa-copy"></i>
                        Pages
                    </a>
                    <ul class="collapse list-unstyled" id="pageSubmenu">
                        <li>
                            <a href="#">Page 1</a>
                        </li>
                        <li>
                            <a href="#">Page 2</a>
                        </li>
                        <li>
                            <a href="#">Page 3</a>
                        </li>
                    </ul>
                </li>
            </ul>

        </nav>

        <!-- Page Content  -->
        <div id="content">
        </div>
    </div>
</body>
</html>

Answer 1

试试这个用jquery来控制样式

https://codepen.io/anon/pen/ZVbVYw

$(document).ready(function () {
    $('#homeSubmenu li, #pageSubmenu li').on('click', function () {
        $('#homeSubmenu li, #pageSubmenu li').removeClass('active');
        $(this).addClass('active');
    });
});