css - 当菜单在向下滚动时变粘时页面跳转

Question

我正在开发一个 HTML 主题。我对粘性菜单有疑问。当在页面上向下滚动时，随着页眉从页面的自然流中移除，页面内容会跳起来。

我尝试为网站的主要内容提供 margin-top 并且成功了。但是当我在处理模板时，这个解决方案对我没有用。任何 jQuery 代码都可以正常工作。提前感谢您的帮助!

$(document).ready(function(){
    var sticky = $('.header-sticky');
    var scroll = $(window).scrollTop();
    if (scroll >= 100) sticky.addClass('header-sticky-on');
    else sticky.removeClass('header-sticky-on');
});

header {
            position: relative;
            z-index: 99;
            background-color: #ccc;
        }
        
/* Sticky header */ 
        header.header-sticky-on {
            position: fixed;
            z-index: 1000;
            top: 0;
            left: 0;
            right: 0;
            background-color: #fff;
            -webkit-animation: fadeInDown .5s;
            animation: fadeInDown .5s;
            width: 100%;
            box-shadow: 0px 0px 40px rgba(83, 88, 93, 0.1); 
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<header class="header-sticky">
    	<!-- ======================= 
    	Main header Start-->
    	<nav class="main-header">
    		<div class="container">
    			"Content goes here Content goes here Content goes here"
    		</div>
    	</nav>
    	<!-- ======================= 
    	Main header End-->
</header>

<section class="main-content">
<p>
What is Lorem Ipsum?

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
Why do we use it?

It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like).

Where does it come from?

Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32.

The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions from the 1914 translation by H. Rackham.
Where can I get some?

There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition, injected humour, or non-characteristic words etc.
</p>
</section>

Answer 1

你可以做的是将 padding-top 添加到 <body>元素。因此，当您的粘性 header 变得粘性时，它不会在您的内容和主包装器之间留下间隙。

这将阻止它跳来跳去，但可以保持制作主题的灵 active 。

$(document).scroll(function() {
  var sticky = $('.header-sticky');
  var scroll = $(window).scrollTop();
  /* Added body padding when actived */
  if (scroll >= 100) {
    sticky.addClass('header-sticky-on');
    $('body').addClass('js-sticky-on');
  } else {
    sticky.removeClass('header-sticky-on');
    $('body').removeClass('js-sticky-on');
  }
});

/* added: height of element */
body.js-sticky-on {
  padding-top: 18px;
}

header {
  position: relative;
  width: 100%;
  z-index: 99;
  background-color: #ccc;
}

header.header-sticky-on {
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  right: 0;
  background-color: #fff;
  -webkit-animation: fadeInDown .5s;
  animation: fadeInDown .5s;
  box-shadow: 0px 0px 40px rgba(83, 88, 93, 0.1);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<body>
  <header class="header-sticky">
    <!-- ======================= 
    	Main header Start-->
    <nav class="main-header">
      <div class="container">
        "Content goes here Content goes here Content goes here"
      </div>
    </nav>
    <!-- ======================= 
    	Main header End-->
  </header>

  <section class="main-content">
    <p>
      What is Lorem Ipsum? Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type
      specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more
      recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Why do we use it? It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The
      point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem
      Ipsum as their default model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like). Where
      does it come from? Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College
      in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and
      1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..",
      comes from a line in section 1.10.32. The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact
      original form, accompanied by English versions from the 1914 translation by H. Rackham. Where can I get some? There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour,
      or randomised words which don't look even slightly believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend
      to repeat predefined chunks as necessary, making this the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The
      generated Lorem Ipsum is therefore always free from repetition, injected humour, or non-characteristic words etc.
    </p>
  </section>
</body>