如何使我的导航栏在移动视图中具有粘性？

时间：2021-01-03 22:50:44

标签： javascript html css

我想让我的导航栏具有粘性，它在常规屏幕视图上工作，但在移动视图上不起作用。

我为宽屏创建了一个常规导航栏，在移动视图中创建了一个汉堡式导航栏。

我还在学习前端，所以我知道下面的代码很糟糕。任何建议将不胜感激。

window.onscroll = function() {myFunction()};

var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop;

var navbar_mobile = document.getElementById("menuToggle");
var sticky_mobile = navbar_mobile.offsetTop;

function myFunction() {
  if (window.pageYOffset >= sticky) {
    navbar.classList.add("sticky");
    navbar_mobile.classList.add("sticky_mobile");
  } else {
    navbar.classList.remove("sticky");
    navbar_mobile.classList.remove("sticky_mobile");
  }
}
/* NAVIGATION FOR WIDE SCREEN*/
#navbar {
   z-index: 10;
}
ul li:before {
    content: ' ';
    position: absolute;
    left: 0;
}
.navigation-menu-sep {
  width: 100%;
  margin: 0 auto;
  background: #fff;
}
.navigation-menu-sep .navigation-menu-sep-ul {
  list-style: none;
  text-align: center;
}
.navigation-menu-sep .navigation-menu-sep-ul li {
  display: inline-block;
}
.navigation-menu-sep .navigation-menu-sep-ul li a {
  display: block;
  padding: 15px;
  text-decoration: none;
  font-weight: 800;
  text-transform: uppercase;
  margin: 0 10px;
}
.navigation-menu-sep .navigation-menu-sep-ul li a,
.navigation-menu-sep ul li a:after,
.navigation-menu-sep ul li a:before {
  transition: all .5s;
}
.navigation-menu .navigation-menu-sep-ul li a:hover {
  color: #555;
}


/* stroke */
.navigation-menu-sep .navigation-menu-sep-ul li a{
  position: relative;
}
.navigation-menu-sep .navigation-menu-sep-ul li a:after {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  width: 0%;
  content: '.';
  color: transparent;
  background: #0e2e39;
  height: 2px;
}
.navigation-menu-sep .navigation-menu-sep-ul li a:hover:after {
  width: 100%;
}
.sticky {
  position: fixed;
  top: 0;
  width: 100%;
  box-shadow: 0px 5px 0px #dedede;
}

.sticky_mobile {
  position: fixed !important;
  top: 0;
  width: 100%;
  box-shadow: 0px 5px 0px #dedede;
}

.sticky + .content {
  padding-top: 60px;
}

@media screen and (max-width: 500px) {
    #navbar {
        display: none;
    }
}
/* NAVIGATION MENU FOR MOBILE - HAMBURGER STYLE */
#menuToggle
{
  display: block;
  position: relative;
  top: 10px;
  background: #fff;
  z-index: 10;
  
  -webkit-user-select: none;
  user-select: none;
  margin-bottom: 50px;

}

@media screen and (min-width: 501px) {
    #menuToggle {
        display: none;
    }
}

#menuToggle input
{
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  
  cursor: pointer;
  
  opacity: 0; /* hide this */
  z-index: 2; /* and place it over the hamburger */
  
  -webkit-touch-callout: none;
}

/*
 * Just a quick hamburger
 */
#menuToggle span
{
  display: block;
  width: 33px;
  height: 4px;
  margin-bottom: 5px;
  margin-top: 5px;
  position: relative;
  
  background: #cdcdcd;
  border-radius: 3px;
  
  z-index: 1;
  
  transform-origin: 4px 0px;
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              background 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              opacity 0.55s ease;
}

#menuToggle span:first-child
{
  transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2)
{
  transform-origin: 0% 100%;
}

/* 
 * Transform all the slices of hamburger
 * into a crossmark.
 */
#menuToggle input:checked ~ span
{
  opacity: 1;
  transform: rotate(45deg) translate(-2px, -1px);
  background: #232323;
}

/*
 * But let's hide the middle one.
 */
#menuToggle input:checked ~ span:nth-last-child(3)
{
  opacity: 0;
  transform: rotate(0deg) scale(0.2, 0.2);
}

/*
 * Ohyeah and the last one should go the other direction
 */
#menuToggle input:checked ~ span:nth-last-child(2)
{
  transform: rotate(-45deg) translate(0, -1px);
}

/*
 * Make this absolute positioned
 * at the top left of the screen
 */
#menu
{
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  
  background: #ededed;
  list-style-type: none;
  -webkit-font-smoothing: antialiased;
  /* to stop flickering of text in safari */
  
  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0);
}

#menu li
{
  padding: 10px 0;
  font-size: 22px;
}

/*
 * And let's slide it in from the left
 */
#menuToggle input:checked ~ ul
{
  transform: none;
}
<div id="navbar">
<nav class="navigation-menu-sep">
    <ul class="navigation-menu-sep-ul">
      <li><a href="#home">Home</a></li>
      <li><a href="#about-us">About us</a></li>
      <li><a href="#new-product">New Products</a></li>
      <li><a href="#more">More</a></li>
    </ul>
</nav>
</div>
<nav role="navigation">
  <div id="menuToggle">
    <!--
    A fake / hidden checkbox is used as click reciever,
    so you can use the :checked selector on it.
    -->
    <input type="checkbox" />
    
    <!--
    Some spans to act as a hamburger.
    
    They are acting like a real hamburger,
    not that McDonalds stuff.
    -->
    <span></span>
    <span></span>
    <span></span>
    
    <!--
    Too bad the menu has to be inside of the button
    but hey, it's pure CSS magic.
    -->
    <ul id="menu">
      <a href="#home"><li>Home</li></a>
      <a href="#about-us"><li>About us</li></a>
      <a href="#new-product"><li>New Products</li></a>
      <a href="#more"><li>More</li></a>
    </ul>
  </div>
</nav>

基本上，我在导航栏上方有更多元素。

我不确定我做错了什么，但是移动视图上的粘性导航栏会粘在顶部，而不是仅在用户滚动时粘住。

3 个答案:

答案 0 :(得分：0)

为此提供了一个 CSS 功能。

position: sticky;

答案 1 :(得分：0)

在切换到粘性模式之前尝试添加一点缓冲区。在下面的修改示例中，在触发粘性模式之前有 100 像素的缓冲区。还删除了 sticky_mobile 类，因为它们都在做同样的事情。

window.onscroll = function() {myFunction()};

var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop + 100;

var navbar_mobile = document.getElementById("menuToggle");
var sticky_mobile = navbar_mobile.offsetTop + 100;

function myFunction() {
  if (window.pageYOffset >= sticky) {
    navbar.classList.add("sticky");
  } else {
    navbar.classList.remove("sticky");
  }
}
/* NAVIGATION FOR WIDE SCREEN*/
#navbar {
   z-index: 10;
}
ul li:before {
    content: ' ';
    position: absolute;
    left: 0;
}
.navigation-menu-sep {
  width: 100%;
  margin: 0 auto;
  background: #fff;
}
.navigation-menu-sep .navigation-menu-sep-ul {
  list-style: none;
  text-align: center;
}
.navigation-menu-sep .navigation-menu-sep-ul li {
  display: inline-block;
}
.navigation-menu-sep .navigation-menu-sep-ul li a {
  display: block;
  padding: 15px;
  text-decoration: none;
  font-weight: 800;
  text-transform: uppercase;
  margin: 0 10px;
}
.navigation-menu-sep .navigation-menu-sep-ul li a,
.navigation-menu-sep ul li a:after,
.navigation-menu-sep ul li a:before {
  transition: all .5s;
}
.navigation-menu .navigation-menu-sep-ul li a:hover {
  color: #555;
}


/* stroke */
.navigation-menu-sep .navigation-menu-sep-ul li a{
  position: relative;
}
.navigation-menu-sep .navigation-menu-sep-ul li a:after {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  width: 0%;
  content: '.';
  color: transparent;
  background: #0e2e39;
  height: 2px;
}
.navigation-menu-sep .navigation-menu-sep-ul li a:hover:after {
  width: 100%;
}
.sticky {
  position: fixed;
  top: 0;
  width: 100%;
  box-shadow: 0px 5px 0px #dedede;
}

.sticky + .content {
  padding-top: 60px;
}

@media screen and (max-width: 500px) {
    #navbar {
        display: none;
    }
}
/* NAVIGATION MENU FOR MOBILE - HAMBURGER STYLE */
#menuToggle
{
  display: block;
  position: relative;
  top: 10px;
  background: #fff;
  z-index: 10;
  
  -webkit-user-select: none;
  user-select: none;
  margin-bottom: 50px;

}

@media screen and (min-width: 501px) {
    #menuToggle {
        display: none;
    }
}

#menuToggle input
{
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  
  cursor: pointer;
  
  opacity: 0; /* hide this */
  z-index: 2; /* and place it over the hamburger */
  
  -webkit-touch-callout: none;
}

/*
 * Just a quick hamburger
 */
#menuToggle span
{
  display: block;
  width: 33px;
  height: 4px;
  margin-bottom: 5px;
  margin-top: 5px;
  position: relative;
  
  background: #cdcdcd;
  border-radius: 3px;
  
  z-index: 1;
  
  transform-origin: 4px 0px;
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              background 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              opacity 0.55s ease;
}

#menuToggle span:first-child
{
  transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2)
{
  transform-origin: 0% 100%;
}

/* 
 * Transform all the slices of hamburger
 * into a crossmark.
 */
#menuToggle input:checked ~ span
{
  opacity: 1;
  transform: rotate(45deg) translate(-2px, -1px);
  background: #232323;
}

/*
 * But let's hide the middle one.
 */
#menuToggle input:checked ~ span:nth-last-child(3)
{
  opacity: 0;
  transform: rotate(0deg) scale(0.2, 0.2);
}

/*
 * Ohyeah and the last one should go the other direction
 */
#menuToggle input:checked ~ span:nth-last-child(2)
{
  transform: rotate(-45deg) translate(0, -1px);
}

/*
 * Make this absolute positioned
 * at the top left of the screen
 */
#menu
{
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  
  background: #ededed;
  list-style-type: none;
  -webkit-font-smoothing: antialiased;
  /* to stop flickering of text in safari */
  
  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0);
}

#menu li
{
  padding: 10px 0;
  font-size: 22px;
}

/*
 * And let's slide it in from the left
 */
#menuToggle input:checked ~ ul
{
  transform: none;
}
<div id="navbar">

<nav class="navigation-menu-sep">
    <ul class="navigation-menu-sep-ul">
      <li><a href="#home">Home</a></li>
      <li><a href="#about-us">About us</a></li>
      <li><a href="#new-product">New Products</a></li>
      <li><a href="#more">More</a></li>
    </ul>
</nav>
</div>

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f


<nav role="navigation">
  <div id="menuToggle">
    <!--
    A fake / hidden checkbox is used as click reciever,
    so you can use the :checked selector on it.
    -->
    <input type="checkbox" />
    
    <!--
    Some spans to act as a hamburger.
    
    They are acting like a real hamburger,
    not that McDonalds stuff.
    -->
    <span></span>
    <span></span>
    <span></span>
    
    <!--
    Too bad the menu has to be inside of the button
    but hey, it's pure CSS magic.
    -->
    <ul id="menu">
      <a href="#home"><li>Home</li></a>
      <a href="#about-us"><li>About us</li></a>
      <a href="#new-product"><li>New Products</li></a>
      <a href="#more"><li>More</li></a>
    </ul>
  </div>
</nav>

答案 2 :(得分：0)

我的 javascript 中有一个错误，这是它无法添加新类“粘性”的原因。 这不是最好的，但它有效。

<script>
window.onscroll = function() {
   myFunction();
   myFunction_mobile();
}

var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop;

var navbar_mobile = document.getElementById("menuToggle");
var sticky_mobile = navbar_mobile.offsetTop;

function myFunction() {
  if (window.pageYOffset >= sticky) {
    navbar.classList.add("sticky");
  } else {
    navbar.classList.remove("sticky");
  }
}
function myFunction_mobile() {
  if (window.pageYOffset >= sticky_mobile) {
    navbar_mobile.classList.add("sticky_mobile");
  } else {
    navbar_mobile.classList.remove("sticky_mobile");
  }
}
</script>
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