Bootstrap 4 Nav-pills

Bootstrap 4 Nav-pills

  • 在Bootstrap 4中,Nav-pills被用于菜单目的,以导航标签为基础的导航。
  • 用Bootstrap 4来证明Nav-pills的合理性,可以通过以下方法实现。

方法 1:

  • 在Bootstrap 3中,为了使Nav-pills合理化,可以使用nav-justify类,但在Bootstrap 4中,默认使用nav-fill或nav-justified类。
  • 为导航标签或导航元素添加nav-fill或nav-justified类。
  • nav-fill和nav-justified的区别在于,nav-fill根据名字的长度为导航栏项目提供不平等的空间,而nav-justified则使导航栏的空间彼此平等。

例子1:下面的例子说明了如何使用nav-fill或nav-justified类,在Bootstrap 4中对导航栏进行调整。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body>
    <div class="container">
        <center>
            <h1 style="color:green;padding:13px;">
                GeeksforGeeeks</h1>
            <br>
            <br>
             
<p>Nav Fill Unequal spatial of Nav Pills</p>
 
            <br>
            <nav class="nav nav-pills nav-fill">
                <a class="nav-item nav-link active" href="#">Active</a>
                <a class="nav-item nav-link" href="#">Much longer nav link</a>
                <a class="nav-item nav-link" href="#">Link</a>
                <a class="nav-item nav-link disabled" href="#"
                    tabindex="-1" aria-disabled="true">
                    Disabled
                </a>
            </nav>
            <br>
             
<p>Nav Justified -Equal spatial of Nav Pills</p>
 
            <br>
            <nav class="nav nav-pills nav-justified">
                <a class="nav-item nav-link active" href="#">
                    Active
                </a>
                <a class="nav-item nav-link" href="#">
                    Much longer nav link
                </a>
                <a class="nav-item nav-link" href="#">
                    Link
                </a>
                <a class="nav-item nav-link disabled" href="#"
                    tabindex="-1" aria-disabled="true">
                    Disabled
                </a>
            </nav>
        </center>
    </div>
    <script>
        (document).ready(function () {
            ('nav a').click(function () {
                ('nav a').removeClass("active");
                (this).addClass("active");
            });
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Nav-pills

方法 2:

  • 在Bootstrap 4中使用flex来证明Nav-pills的合理性,即如果Nav是用flex box制作的。
  • 为导航标签或导航元素添加flex-column和flex-sm-row类。
  • 这种灵活性在某种程度上类似于NAV-FILL,因为它的NAV药丸的不平等空间。

例子2:下面的例子说明了如何用Bootstrap 4的flex来证明Nav-pills的合理性。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body>
    <div class="container">
        <center>
            <h1 style="color:green;padding:13px;">
                GeeksforGeeeks</h1>
            <br>
            <br>
             
<p>Using Flex -Unequal spatial of Nav Pills</p>
 
            <br>
            <nav class="nav nav-pills flex-column flex-sm-row">
                <a class="flex-sm-fill text-sm-center nav-link active"
                    href="#">
                    Active
                </a>
                <a class="flex-sm-fill text-sm-center nav-link"
                    href="#">
                    Longer nav link
                </a>
                <a class="flex-sm-fill text-sm-center nav-link"
                    href="#">
                    Link
                </a>
                <a class="flex-sm-fill text-sm-center nav-link disabled"
                    href="#" tabindex="-1" aria-disabled="true">
                    Disabled
                </a>
            </nav>
        </center>
    </div>
    <script>
        (document).ready(function () {
            ('nav a').click(function () {
                ('nav a').removeClass("active");
                (this).addClass("active");
            });
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Nav-pills

参考: https://getbootstrap.com/docs/4.0/components/navs/

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