javascript – 如何使用Jquery切换元素

2019-07-27 01:35:59 阅读：135 来源： 互联网

我正在尝试使用HTML,CSS和JS创建一个导航栏.但是,我在尝试切换汉堡包时遇到问题,因此当您滑动菜单滑出时单击汉堡包并再次单击汉堡包时它会隐藏幻灯片菜单.

为此,我创建了两个函数,并将内联函数称为opennav函数.

function openNav() {
  document.getElementById("mySidenav").style.width = "250px";
}

function closeNav() {
  document.getElementById("mySidenav").style.width = "0";
}

@import url('https://fonts.googleapis.com/css?family=Rubik');
body {
  margin: 0;
  font-family: "Rubik", sans-serif
}

.topnav {
  position: relative;
  overflow: hidden;
  background-color: #122B3C;
  height: 65px;
}

.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a.active {
  background-color: #4CAF50;
  color: white;
}

.topnav-centered a {
  float: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.topnav-right {
  float: right;
}

.hamburger {
  display: inline-block;
  cursor: pointer;
  position: fixed;
  z-index: 999;
}

.home-hamburger {
  position: static;
}

.nav-center {
  position: absolute;
  left: 48%;
  width: 40px;
  margin-left: -20px;
  /* halve the width of the image */
}

.doch {
  position: fixed !important;
  top: 0;
}

.bar1,
.bar2,
.bar3 {
  width: 40px;
  height: 3px;
  background-color: #ffffff;
  margin: 7px 0;
  transition: 0.4s;
}

.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #304C58;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 16px;
  text-decoration: none;
  font-size: 25px;
  color: #122B3C;
  display: block;
  transition: 0.3s;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 10px;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

3 @media screen and (max-height: 450px) {
  .sidenav {
    padding-top: 15px;
  }
  .sidenav a {
    font-size: 18px;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

<div class="topnav">
  <div class="topnav-centered">
    <a href="#home"><img src="https://via.placeholder.com/350x150" alt=""></a>
  </div>
  <a href="#news">
    <div id="toggle" class="hamburger" onclick="openNav()">
      <div class="bar1"></div>
      <div class="bar2"></div>
      <div class="bar3"></div>
    </div>
  </a>
</div>
<div style="padding-left:16px">
  <h2>Responsive Top Navigation with Centered and Right-Aligned Links</h2>
  <p>Resize the browser window to see the responsive effect.</p>
</div>
<div id="mySidenav" class="sidenav">
  <a href="#">What we do</a>
  <a href="#">How we do it</a>
  <a href="#">Team</a>
  <a href="#">Work for us</a>
  <a href="#">Jobs</a>
  <a href="#">Contact Us</a>
</div>

可待因我的问题是https://codepen.io/mrsalami/pen/JadoyR

解决方法:

你不必为此需要jQuery.您可以轻松修改当前的普通JS逻辑,以使其按您的需要工作.

首先,不要使用内联事件处理程序或CSS,这两者都是不好的做法.相反,使用不显眼的事件处理程序.然后,您可以创建单个事件处理程序,通过在元素上切换CSS类来打开和关闭菜单,该类在元素上设置所需的宽度.试试这个：

document.getElementById('toggle').addEventListener('click', function() {
  document.getElementById("mySidenav").classList.toggle('open');
});

@import url('https://fonts.googleapis.com/css?family=Rubik');
body {
  margin: 0;
  font-family: "Rubik", sans-serif
}

.topnav {
  position: relative;
  overflow: hidden;
  background-color: #122B3C;
  height: 65px;
}

.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a.active {
  background-color: #4CAF50;
  color: white;
}

.topnav-centered a {
  float: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.topnav-right {
  float: right;
}

.hamburger {
  display: inline-block;
  cursor: pointer;
  position: fixed;
  z-index: 999;
}

.home-hamburger {
  position: static;
}

.nav-center {
  position: absolute;
  left: 48%;
  width: 40px;
  margin-left: -20px;
  /* halve the width of the image */
}

.doch {
  position: fixed !important;
  top: 0;
}

.bar1,
.bar2,
.bar3 {
  width: 40px;
  height: 3px;
  background-color: #ffffff;
  margin: 7px 0;
  transition: 0.4s;
}

.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #304C58;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav.open {
  width: 250px;
}

.sidenav a {
  padding: 8px 8px 8px 16px;
  text-decoration: none;
  font-size: 25px;
  color: #122B3C;
  display: block;
  transition: 0.3s;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 10px;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

3 @media screen and (max-height: 450px) {
  .sidenav {
    padding-top: 15px;
  }
  .sidenav a {
    font-size: 18px;
  }
}

<div class="topnav">
  <div class="topnav-centered">
    <a href="#home"><img src="https://via.placeholder.com/350x150" alt=""></a>
  </div>
  <a href="#news">
    <div id="toggle" class="hamburger">
      <div class="bar1"></div>
      <div class="bar2"></div>
      <div class="bar3"></div>
    </div>
  </a>
</div>
<div style="padding-left:16px">
  <h2>Responsive Top Navigation with Centered and Right-Aligned Links</h2>
  <p>Resize the browser window to see the responsive effect.</p>
</div>
<div id="mySidenav" class="sidenav">
  <a href="#">What we do</a>
  <a href="#">How we do it</a>
  <a href="#">Team</a>
  <a href="#">Work for us</a>
  <a href="#">Jobs</a>
  <a href="#">Contact Us</a>
</div>

如果你想使用jQuery,那么将JS更改为：

$(function() {
  $('#toggle').click(function() {
    $('#mySidenav').toggleClass('open');
  });
});

标签：html,javascript,jquery,css
来源： https://codeday.me/bug/20190727/1549414.html

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javascript – 如何使用Jquery切换元素