Html 如何在页面顶部保留导航栏？

how do I keep a nav bar at the top of the page?

提问by Adam Scot

I'm trying to make my nav bar stay at the top of the page like on forbes.com

我试图让我的导航栏像在forbes.com上一样停留在页面顶部

I know I could do

我知道我可以

nav
{
   position: fixed;
   top: 0;
}

but the nav bar isn't at the top of the page, it comes after the logo... When you scroll down however, I want the nav bar to stick to the top of the screen..

但是导航栏不在页面顶部，它位于徽标之后......但是，当您向下滚动时，我希望导航栏粘在屏幕顶部..

This is my site

这是我的网站

回答by mrtriangle

You could try it in JQuery like this:

你可以像这样在 JQuery 中尝试它：

HTML:

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:

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:

查询：

$(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');
        }
    });
});

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

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

回答by user2584704

the solution is easy, keep your css while adding px

解决方案很简单，在添加 px 的同时保留你的 css

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

回答by Oscar Belletti

Here is a way to do it without JQuery. It works by setting a scroll listener to the window, and switching the class of the nav bar when the scroll reaches the right position.

这是一种无需 JQuery 的方法。它的工作原理是为窗口设置滚动侦听器，并在滚动到达正确位置时切换导航栏的类。

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;
}

<h1>
Hello world
</h1>
<nav id="navigation" class="staticnav"><a href="#">Home</a>  <a href="#">About</a>
</nav>
<!-- We initialize the nav with static condition -->
<p>
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
  Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.
</p>

回答by Archita Sundaray

This is how the navigation-bar sticks to the top after scrolling past it.

这就是导航栏在滚动过去后粘在顶部的方式。

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

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

"navbar" creates a block on it's own, so all you've to do is mention only the margin in your css file .navbar { margin: 0px auto; /*You can set your own margin for top-bottom & right-left respectively*/ z-index: 1; }The z-index sets priority to that particular element, so that other elements do not scroll over it. If z-index has a positive value, then it has the highest priority otherwise lowest priority(for negative values). I hope this is helpful.

"navbar" 自己创建一个块，所以你所要做的就是只在你的 css 文件中提到边距 .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，这样其他元素就不会滚动到它上面。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）。我希望这是有帮助的。

回答by Andreas Damen

In your css file:

在你的 css 文件中：

body {
    padding-top: 0px;
}

回答by DINA TAKLIT

You can use:

您可以使用：

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

See this complete example example:

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?
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         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>

回答by Hymans

nav {
    position: sticky;
    top: 0;
}

回答by Chris Love

Use position absolute and set the top value to the number of pixels you want the Nav bar to be from the top of the browser.

使用绝对位置并将顶部值设置为您希望导航栏距浏览器顶部的像素数。