如何在 Bootstrap 中居中导航项目? [英] How to center nav-items in Bootstrap?

问题描述

如果我想根据 Bootstrap 4 中的浏览器窗口大小将导航栏上的导航项(链接)居中怎么办.看一下代码:

<nav class="navbar navbar-toggleable-md navbar-light bg-faded"><button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="切换导航"><span class="navbar-toggler-icon"></span><a class="navbar-brand" href="#">Navbar</a><div class="collapse navbar-collapse" id="navbarNavAltMarkup"><div class="navbar-nav"><a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a><a class="nav-item nav-link" href="#">功能</a><a class="nav-item nav-link" href="#">定价</a><a class="nav-item nav-link disabled" href="#">Disabled</a>

</nav>

现在我想根据浏览器宽度将 div "navbar-nav" 居中.我尝试过的一件事是给它 mr-auto 和 ml-auto，这似乎确实使它居中，但并不完全如此.它实际执行的操作是根据宽度浏览器窗口宽度 - 徽标宽度"将其居中.我希望它正好在屏幕中间居中.

我也尝试将位置更改为绝对位置，但在折叠模式下同样会弄乱布局.

解决方案

响应式地使用 flexbox 和边距工具...

引导程序 4 alpha 6

编辑..

答案仍然基本相同.使用 mx-auto 居中.

http://codeply.com/go/mycC5z8lpJ(中心链接，品牌左侧)

<nav class="navbar navbar-toggleable-md navbar-light bg-faded"><button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="切换导航"><span class="navbar-toggler-icon"></span><a class="navbar-brand" href="#">Navbar</a><div class="collapse navbar-collapse" id="navbarNavAltMarkup"><div class="navbar-nav mx-auto"><a class="nav-link active" href="#">Home <span class="sr-only">(current)</span></a><a class="nav-link" href="#">功能</a><a class="nav-link" href="#">定价</a><a class="nav-link disabled" href="#">Disabled</a>

</nav>

如果您希望链接完全在视口中居中，请参阅此处的第二个示例:http://www.codeply.com/go/RCBftzZCD8

其他 Bootstrap 4 导航栏对齐示例

另见...

将 Bootstrap 4 导航栏中的元素居中
中心导航栏没有品牌的链接在 Bootstrap 4 中将其推到右侧?
如何使用 Flexbox 在 Bootstrap 4 中居中导航栏
如何在 Bootstrap 4 中定位导航栏内容
Bootstrap 4 导航栏对齐徽标中心和左侧的切换图标

What if I want to center the nav-items (links) on the navbar according to the browser window size in Bootstrap 4. Take a look at the code:

<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar</a>
    <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
        <div class="navbar-nav">
            <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
            <a class="nav-item nav-link" href="#">Features</a>
            <a class="nav-item nav-link" href="#">Pricing</a>
            <a class="nav-item nav-link disabled" href="#">Disabled</a>
        </div>
    </div>
</nav>

Now I want to center the div "navbar-nav" according to browser width. One thing that I have tried is giving it mr-auto and ml-auto which does seem to center it but not exactly. What it actually does it centers it according to the width "browser window width - logo width" . I want it centered exactly in the middle of the screen.

I have tried changing position to absolute as well but again that kind of messes up layout in collapsed mode as well.

解决方案

Use the flexbox and margin utils responsively...

Bootstrap 4 alpha 6 http://codeply.com/go/YvzHvQQRAs (center brand & links)

<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="d-md-flex d-block flex-row mx-md-auto mx-0">
        <a class="navbar-brand" href="#">Navbar</a>
        <div class="collapse navbar-collapse mr-auto" id="navbarNavAltMarkup">
            <div class="navbar-nav">
                <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
                <a class="nav-item nav-link" href="#">Features</a>
                <a class="nav-item nav-link" href="#">Pricing</a>
                <a class="nav-item nav-link disabled" href="#">Disabled</a>
            </div>
        </div>
    </div>
</nav>

Bootstrap 4.1 https://www.codeply.com/go/sTJUthyswN (center brand, align left on mobile)

EDIT..

The answer is still basically the same. Use mx-auto to center.

http://codeply.com/go/mycC5z8lpJ (center links, brand left)

<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar</a>
    <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
        <div class="navbar-nav mx-auto">
            <a class="nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
            <a class="nav-link" href="#">Features</a>
            <a class="nav-link" href="#">Pricing</a>
            <a class="nav-link disabled" href="#">Disabled</a>
        </div>
    </div>
</nav>

If you want the links exactly centered in the viewport, see the 2nd example here: http://www.codeply.com/go/RCBftzZCD8

Other Bootstrap 4 Navbar alignment examples

Also see...

Center an element in Bootstrap 4 Navbar
Center Navbar links without brand pushing it to the right in Bootstrap 4?
How to center navbar in Bootstrap 4 using Flexbox
How to position navbar contents in Bootstrap 4
Bootstrap 4 Navbar align logo center and toggle icon on the left

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