How do I make Bootstrap navbar change active state?(如何使引导导航栏更改活动状态？)

本文介绍了如何使引导导航栏更改活动状态？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我是HTML和JavaScript的新手，现在我面临着一个问题，我想你们中的许多人都在处理这个问题。

我有一个导航栏，默认情况下，当我单击不同的页面引用时，它不会更改活动状态。

默认情况下，‘Home’NAV-Item处于活动状态，我想在单击其他NAV-Items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，但是我希望在这里得到一些帮助。

以下是我的代码：

<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>

推荐答案

您可以在代码的末尾执行此操作。就在<script src="main.js"></script>

下方 
<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>

和它们，而不是后跟链接(event.preventDefault())，例如。about.html或ploads.html这段代码更改所单击项目的活动类。

编辑1：

对于静电页面(或已送达，例如php)您不需要任何额外的js代码，但是您应该将nav调整为如下示例所示(查看"active"类在哪里，sr-only span current是可选的，但在示例中放置得很好)。

index.html(您的基代码)

<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>

Library.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>

ploads.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>

about.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>

这篇关于如何使引导导航栏更改活动状态？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！