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How to use Layui to implement responsive navigation bar menu function

王林Original: 2023-10-27 16:58:411319browse

In modern web design, responsive design is a very important concept. With the popularity of mobile devices, people are increasingly using mobile phones and tablets to access the web. Therefore, a navigation bar menu function that adapts to various screen sizes is essential. Layui is a lightweight front-end interface framework that provides a wealth of components and tools to help us quickly build beautiful and powerful web pages. In this article, we will introduce how to use Layui to implement responsive navigation bar menu functions and provide specific code examples.

First of all, we need to prepare the relevant files of Layui. You can download the latest Layui files on the official Layui website and introduce these files in the HTML file. The following is a simple HTML template:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>响应式导航栏菜单</title>
    <link rel="stylesheet" href="layui/css/layui.css">
    <script src="layui/layui.js"></script>
</head>
<body>
</body>
</html>

Next, we need to add a container for the navigation bar menu in the body part and use Layui's nav() method to build the navigation bar menu . The specific code is as follows:

<body>
    <div class="layui-nav" lay-filter="navMenu">
        <ul class="layui-nav layui-nav-tree" lay-shrink="all" lay-filter="navFilter">
            <li class="layui-nav-item"><a href="/">首页</a></li>
            <li class="layui-nav-item"><a href="/html">HTML</a></li>
            <li class="layui-nav-item"><a href="/css">CSS</a></li>
            <li class="layui-nav-item"><a href="/javascript">JavaScript</a></li>
        </ul>
    </div>
</body>

The above is a simple navigation bar menu, including 4 menu items. We use the layui-nav class name to define the navigation bar style, and use the lay-filter attribute to define the navigation bar filter. Filters are mainly used to define the event callback function of the navigation bar. Here, we define a filter named navMenu.

Next, we need to use Layui’s element() method to initialize the navigation bar. The specific code is as follows:

<script>
    layui.use(['element'], function(){
        var element = layui.element;
    })
</script>

In the element() method, we can specify the options required by Layui. For example, we can specify the filter of the navigation bar as navMenu, so that Layui will call our callback function to handle the click event of the navigation bar. The specific code is as follows:

<script>
    layui.use(['element'], function(){
        var element = layui.element;

        element.on('nav(navMenu)', function(elem){
            console.log(elem); // 打印菜单项的DOM对象
        });
    })
</script>

In the above code, we define an event listener. When the navigation bar menu is clicked, this listener will be triggered and the DOM object of the menu item will be passed to the callback function. We can handle the click event of the menu item ourselves in the callback function. For example, we can output the DOM object of the menu item in the console, or use jQuery to operate the menu item.

Finally, we can also use Layui's collapse() method to implement the folding function of the navigation bar. The specific code is as follows:

<body>
    <div class="layui-nav" lay-filter="navMenu">
        <ul class="layui-nav layui-nav-tree" lay-shrink="all" lay-filter="navFilter">
            <li class="layui-nav-item"><a href="/">首页</a></li>
            <li class="layui-nav-item"><a href="/html">HTML</a></li>
            <li class="layui-nav-item"><a href="/css">CSS</a></li>
            <li class="layui-nav-item"><a href="/javascript">JavaScript</a></li>
        </ul>
    </div>

    <script>
        layui.use(['element'], function(){
            var element = layui.element;

            element.on('nav(navMenu)', function(elem){
                console.log(elem); // 打印菜单项的DOM对象
            });

            element.on('nav(navFilter)', function(elem){
                $(elem).parent().siblings().removeClass('layui-nav-itemed');
            });
        })
    </script>
</body>

In the above code, we define another event listener. When the navigation bar menu is clicked, this listener will be triggered and the DOM object of the menu item will be passed to the callback function. . In the callback function, we use jQuery to remove the layui-nav-itemed class name of all sibling nodes to implement the folding function of the menu item.

Through the above steps, we successfully used Layui to implement a responsive navigation bar menu function. The navigation bar automatically adjusts its layout on different screen sizes and can be collapsed. You can customize the style and logic of the navigation bar according to your needs. Hope this article is helpful to you!

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