如何在页面顶部保留导航栏？

Question

我正试图让我的导航栏停留在页面顶部，如forbes.com

我知道我能做到

nav
{
   position: fixed;
   top: 0;
}

但是导航栏不在页面的顶部，它出现在徽标之后......当你向下滚动时，我希望导航栏粘在屏幕的顶部..

This is my site

Answer 1

您可以在JQuery中尝试这样：

HTML：

<div id="wrapper">

    <header>
        <h1>Floater Navigation</h1>
    </header>

    <nav>
        <p>Navigation Content</p>
    </nav>

    <div id="content">
            <p>Lorem Ipsum.</p>
    </div>
</div>

CSS：

#wrapper {
    width:940px;
    margin: 0 auto;
}

header {
    text-align:center;
    padding:70px 0;
}

nav {
    background: #000000;
    height: 60px;
    width: 960px;
    margin-left: -10px;
    line-height:50px;
    position: relative;
}

#content {
    background: #fff;
    height: 1500px; /* presetting the height */
    box-shadow: 0 0 5px rgba(0,0,0,0.3);
}

.fixed {
    position:fixed;
}

JQuery的：

$(document).ready(function() {

    // Calculate the height of <header>
    // Use outerHeight() instead of height() if have padding
    var aboveHeight = $('header').outerHeight();

    // when scroll
    $(window).scroll(function(){

        // if scrolled down more than the header’s height
        if ($(window).scrollTop() > aboveHeight){

            // if yes, add “fixed” class to the <nav>
            // add padding top to the #content 
            // (value is same as the height of the nav)
            $('nav').addClass('fixed').css('top','0').next().css('padding-top','60px');

        } else {

            // when scroll up or less than aboveHeight,
            // remove the “fixed” class, and the padding-top
            $('nav').removeClass('fixed').next().css('padding-top','0');
        }
    });
});

来源：http://www.jay-han.com/2011/11/10/simple-smart-sticky-navigation-bar-with-jquery/

Answer 2

解决方案很简单，在添加px时保持你的css

nav
{
   position: fixed;
   top: 0px;
}

Answer 3

这是一种没有JQuery的方法。 它的工作原理是将滚动侦听器设置到窗口，并在滚动到达正确位置时切换导航栏的类。

z+a*y

var body = document.getElementsByTagName("body")[0];
var navigation = document.getElementById("navigation");

window.addEventListener("scroll", function(evt) {
  if (body.scrollTop > navigation.getBoundingClientRect().bottom) {
    // when the scroll's y is bigger than the nav's y set class to fixednav
    navigation.className = "fixednav"
  } else { // Overwise set the class to staticnav
    navigation.className = "staticnav"
  }
});

h1 {
  margin: 0;
  padding: 10px;
}
body {
  margin: 0px;
  background-color: white;
}
p {
  margin: 10px;
}
.fixednav {
  position: fixed;
  top: 0;
  left: 0;
}
.staticnav {
  position: static;
}
#navigation {
  background-color: blue;
  padding: 10px;
  width: 100%;
}
#navigation a {
  padding: 10px;
  color: white;
  text-decoration: none;
}

Answer 4

这是导航栏在滚过它后如何粘到顶部的方式。

.affix {
	top: 0px;
	margin: 0px 20px;
}
.affix + .container {
	padding: 5px;
}

<nav class="navbar navbar-default" data-spy="affix" data-offset-top="50">
...
</nav>

“navbar”会自行创建一个块，所以你所要做的只是提到你的css文件中的边距 .navbar { margin: 0px auto; /*You can set your own margin for top-bottom & right-left respectively*/ z-index: 1; } z-index为该特定元素设置优先级，以便其他元素不会在其上滚动。如果z-index具有正值，则它具有最高优先级，否则具有最低优先级（对于负值）。 我希望这有用。

Answer 5

在您的CSS文件中：

body {
    padding-top: 0px;
}

Answer 6

您可以使用：

nav
{
   position: fixed;
   top: 0;
   left: 0;
}

请参阅此完整示例示例：

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}

#header {
    width: 100%;
    height: 90vh;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 60px 12px;
}

header nav {
    width: 100%;
    height: 10vh;
    background-color: #262534;
    display: grid;
    align-items: center;
    border-bottom: 4px solid #F9690E;
    position: fixed;
    top: 0;
    left: 0;
}

header .nav-item {
    display: inline;
    margin: 0 8px;
}

header .nav-item:first-of-type {
    margin-left: 48px;
}

header .nav-item a {
    color: white;
    text-decoration: none;
    font-size: 16px;
}

header .nav-item a:hover {
    text-decoration: underline;
}

header #more-drop-down-menu a:last-of-type:hover {
    text-decoration: none;
}

header .nav-item a.active {
    text-decoration: underline;
    color: #F9690E;
}

/** menu**/
menu{
  margin-top:14vh;
  text-align: center;
}
menu p{
  font-size: 14px;
  line-height:125%;
  padding: 25px;
}

<header>
         
        <!-- Start Nav -->
        <nav>
            <ul>
                <li class="nav-item"><a href="#Home" class="active">Home</a></li>
                <li class="nav-item"><a href="#About">About</a></li>
                <li class="nav-item"><a href="#Contact">Contact</a></li>
                <!-- END Drop Down Menu -->

            </ul>
        </nav>
        <!-- End Nav -->   
    </header>
 <menu>
 <h1> Example of fixed nav</h1>
     <p>
         Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque exercitationem ipsa quisquam sunt ex blanditiis iure vero molestias impedit recusandae eius quasi unde assumenda molestiae, dolorem illum, aliquid aut neque?
         Error aut voluptatum molestias ad quidem odio labore eaque veniam fugiat earum, aliquid incidunt beatae nam pariatur minus voluptates atque suscipit cupiditate et! Tenetur eveniet delectus aspernatur? Perferendis, modi similique.
         Debitis eaque suscipit tenetur, laboriosam perferendis possimus voluptas expedita labore aspernatur. Nobis cum vel quae voluptates pariatur architecto quas labore assumenda ipsam sint tenetur, nisi in non alias quisquam atque.
         Animi, exercitationem ullam laudantium dolores praesentium distinctio illo, fugiat iusto soluta quibusdam eius? Quaerat reiciendis voluptatum voluptatibus porro saepe blanditiis nam iure odio soluta, cum ipsam, suscipit molestiae natus eius!
         Quasi, quae harum? Fuga facere facilis, cumque veniam voluptatum itaque aspernatur natus ratione nesciunt dolores qui, iste ullam dolorem totam accusantium officiis nisi hic esse reiciendis molestias. Unde, inventore fugiat?
         Corrupti similique consequatur provident aliquam voluptates minima modi voluptatibus exercitationem magni, consectetur delectus? Rerum quo cumque dolorem voluptatibus tempora, nesciunt laboriosam eum assumenda deserunt error ullam asperiores velit suscipit corrupti!
         Perspiciatis architecto illo quis dolore necessitatibus ad accusantium voluptatem esse ducimus! Modi facilis consequuntur mollitia asperiores praesentium. Tempora vero quod aliquam, alias quis, nisi cumque totam sed odit, hic suscipit.
         Aut molestias minus accusantium, cumque, aspernatur quia aliquam accusamus nostrum saepe, eius vero velit. Labore a deserunt voluptate illo, eum eos, ad saepe, eius temporibus quis eaque ea reiciendis soluta!
     </p>
 </menu>

Answer 7

使用绝对位置并将顶部值设置为您希望导航栏位于浏览器顶部的像素数。

Answer 8

nav {
    position: sticky;
    top: 0;
}