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導航欄展開時，如何使它滾動並固定到頁面頂部？

[英]How can I make the navbar scroll and fix to the top of the page when it is expanded?

 原文  2016-07-24 20:04:19  9   1    javascript/ html/ css/ navbar/ affix

問題描述

當我的導航欄折疊時，滾動是正常的，並且滾動到頁眉/超大屏幕時，導航欄固定在頁面頂部。 但是，當導航欄展開時（顯示“一個”，“兩個”和“三個”），頁面將跳過某些內容，並被導航欄覆蓋。 如何使頁面滾動/“正常”運行並允許擴展的導航欄修復到頁面頂部，而不會跳過下面的內容？ 

<!DOCTYPE html>
<html>

<head>
    <title>Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <link href="https://fonts.googleapis.com/css?family=Cabin" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet">
    <script type="text/javascript">
    </script>
    <style>
        .affix {
            top: 0;
            width: 100%;
        }
        .affix + .container-fluid {
            padding-top: 70px;
        }
        nav {
            z-index: 9;
        }
        .emoji p:hover {
            text-decoration: none;
        }
    </style>
</head>

<body>
    <div class="container-fluid" style="background-color:#f64e09; color:#fff; height:200px;">
        <div class="container text-center" style="color: white;">
            <div>
                <h1 style="font-family: 'Lobster', cursive;">Website</h1> </div>
            <h1 style="font-size: 30px; font-family: 'Cabin', sans-serif;">

    </h1> </div>
    </div>
    <nav class="navbar navbar-inverse" data-spy="affix" data-offset-top="197">
        <div class="container-fluid">
            <div class="navbar-static-top">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a id="navId" class="navbar-brand" style="color:white;" href="#">Navbar Title</a> </div>
            <div class="collapse navbar-collapse" id="myNavbar">
                <ul class="nav navbar-nav">
                    <li><a href="#">One</a> </li>
                    <li class="active"><a href="#">Two</a> </li>
                    <li><a href="#">Three</a> </li>
                </ul>
            </div>
        </div>
    </nav>
    <!-- Start containter for everything south of navbar -->
    <div class="container-fluid">
        <div class="container" style="padding-top: 20px;">
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1> </div>
    </div>
    <div class="panel panel-default" style="font-family: 'Cabin', sans-    serif;">
        <div class="panel-footer">
            <center>
                <p>This is the footer</p>
            </center>
        </div>
    </div>
</body>

</html>

1 個解決方案

解決方案1
 0 已采納  2016-07-24 20:58:26

如您所知，導航欄折疊時內容沒有“跳躍”的原因是這種樣式： 

.affix + .container-fluid {
    padding-top: 70px;
}

但是，當您擴展導航欄時，填充保持不變，但是導航欄本身變得更高。 因此，我們必須以某種方式掩蓋這些情況。

我們可以添加一些javascript來為<nav>元素添加一個額外的類： 

<script type="text/javascript">
    $(document).ready(function() {
        var navBar = $('#myNavbar');
        $('.navbar-toggle').click(function(e) {
            if (!navBar.is(':visible')) {
                // #myNavbar is about to be shown, add extra class to parent <nav>
                navBar.parents('nav').addClass('affix-visible-navbar');
            } else {
                // #myNavbar is about to be hidden, remove extra class from parent <nav>
                navBar.parents('nav').removeClass('affix-visible-navbar');
            }
        });
    });
</script>

並定義新的CSS類： 

.affix.affix-visible-navbar + .container-fluid  {
    padding-top: 155px !important;
}

因此，完整的工作解決方案將如下所示： 

<!DOCTYPE html>
<html>

<head>
    <title>Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <link href="https://fonts.googleapis.com/css?family=Cabin" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet">
    <script type="text/javascript">
    </script>
    <style>
        .affix {
            top: 0;
            width: 100%;
        }
        .affix + .container-fluid {
            padding-top: 70px;
        }
        .affix.affix-visible-navbar + .container-fluid  {
            padding-top: 155px !important;
        }
        nav {
            z-index: 9;
        }
        .emoji p:hover {
            text-decoration: none;
        }
    </style>
    <script type="text/javascript">
        $(document).ready(function() {
            var navBar = $('#myNavbar');
            $('.navbar-toggle').click(function(e) {
                if (!navBar.is(':visible')) {
                    // #myNavbar is about to be shown, add extra class to parent <nav>
                    navBar.parents('nav').addClass('affix-visible-navbar');
                } else {
                    // #myNavbar is about to be hidden, remove extra class from parent <nav>
                    navBar.parents('nav').removeClass('affix-visible-navbar');
                }
            });
        });
    </script>
</head>

<body>
    <div class="container-fluid" style="background-color:#f64e09; color:#fff; height:200px;">
        <div class="container text-center" style="color: white;">
            <div>
                <h1 style="font-family: 'Lobster', cursive;">Website</h1> </div>
            <h1 style="font-size: 30px; font-family: 'Cabin', sans-serif;">

    </h1> </div>
    </div>
    <nav class="navbar navbar-inverse" data-spy="affix" data-offset-top="197">
        <div class="container-fluid">
            <div class="navbar-static-top">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a id="navId" class="navbar-brand" style="color:white;" href="#">Navbar Title</a> </div>
            <div class="collapse navbar-collapse" id="myNavbar">
                <ul class="nav navbar-nav">
                    <li><a href="#">One</a> </li>
                    <li class="active"><a href="#">Two</a> </li>
                    <li><a href="#">Three</a> </li>
                </ul>
            </div>
        </div>
    </nav>
    <!-- Start containter for everything south of navbar -->
    <div class="container-fluid">
        <div class="container" style="padding-top: 20px;">
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1>
            <h1>Content so the page scrolls</h1> </div>
    </div>
    <div class="panel panel-default" style="font-family: 'Cabin', sans-    serif;">
        <div class="panel-footer">
            <center>
                <p>This is the footer</p>
            </center>
        </div>
    </div>
</body>

</html>

當然，如果要更改#myNavbar元素（例如，添加/刪除項目），則必須在.affix.affix-visible-navbar + .container-fluid {}調整填充

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