如何使 Bootstrap 导航栏更改活动状态？

Question

我是 HTML 和 JavaScript 的新手，现在我面临一个问题，我认为你们中的许多人一直在处理自己的问题。

我有一个导航栏，当我单击不同的页面引用时，默认情况下它不会更改活动状态。

“主页”导航项默认处于活动状态，我想在单击其他导航项时更改活动状态。但我不知道该怎么做？据我所知，这不是太多的代码行，但我很想在这里得到一些帮助。

这是我的代码：

<head>
    <meta charset="UTF-8">
    <title>MaU Movie database</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://bootswatch.com/4/cyborg/bootstrap.min.css">
    <link rel="stylesheet" href="style.css">
    <link rel="icon" href="mumdblogo.png">
</head>

<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
        <a class="navbar-brand" href="index.html" id="movielogo"><img src="moviefylogo.png"></a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarColor02" aria-controls="navbarColor02"
            aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarColor02">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item active">
                    <a class="nav-link" href="index.html">Home
                        <span class="sr-only">(current)</span>
                    </a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="library.html">Library</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="uploads.html">Uploads</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="about.html">About</a>
                </li>
            </ul>
        </div>
    </nav>

    <div class="container">
        <div class="jumbotron">
            <h3 class="text-center">Search Movie!</h3>
            <form id="searchForm">
                <input type="text" class="form-control" id="searchText" placeholder="Search for any movie...">
            </form>
        </div>
    </div>

    <div class="container">
        <div id="movies" class="row">
    </div>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
    <script src="main.js"></script>

</body>
</html>

Answer 1

您可以在代码结束时执行此操作。略低于<script src="main.js"></script>

<script>
$(document).ready(function() {
    $( ".mr-auto .nav-item" ).bind( "click", function(event) {
        event.preventDefault();
        var clickedItem = $( this );
        $( ".mr-auto .nav-item" ).each( function() {
            $( this ).removeClass( "active" );
        });
        clickedItem.addClass( "active" );
    });
});
</script>

他们而不是跟随链接（event.preventDefault()），例如。about.html 或 uploads.html 这段代码更改单击项目的活动类。

编辑 1：

对于静态页面（或由 php 提供），您不需要任何额外的 js 代码，但是您应该将导航调整为如下例所示（查看“活动”类所在的位置，sr-only span current 是可选的，但是很好地放置在示例中）。

index.html（您的基本代码）

<ul class="navbar-nav mr-auto">
    <li class="nav-item active">
        <a class="nav-link" href="index.html">Home<span class="sr-only">(current)</span></a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="library.html">Library</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="uploads.html">Uploads</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="about.html">About</a>
    </li>
</ul>

图书馆.html

<ul class="navbar-nav mr-auto">
    <li class="nav-item">
        <a class="nav-link" href="index.html">Home</a>
    </li>
    <li class="nav-item active">
        <a class="nav-link" href="library.html">Library<span class="sr-only">(current)</span></a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="uploads.html">Uploads</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="about.html">About</a>
    </li>
</ul>

上传.html

<ul class="navbar-nav mr-auto">
    <li class="nav-item">
        <a class="nav-link" href="index.html">Home</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="library.html">Library</a>
    </li>
    <li class="nav-item active">
        <a class="nav-link" href="uploads.html">Uploads<span class="sr-only">(current)</span></a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="about.html">About</a>
    </li>
</ul>

关于.html

<ul class="navbar-nav mr-auto">
    <li class="nav-item">
        <a class="nav-link" href="index.html">Home</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="library.html">Library</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="uploads.html">Uploads</a>
    </li>
    <li class="nav-item active">
        <a class="nav-link" href="about.html">About<span class="sr-only">(current)</span></a>
    </li>
</ul>