jquery - 为什么我的粘性导航不起作用？

标签 jquery html css

我已经尝试了所有方法，但这个粘性中殿无法正常工作。您可以跳过 CSS 并直接转到 HTML，其中包含我正在尝试使用的 jQuery 来实现此目的。

代码:

body {
  margin: 0px;
  background-color: #fff;
}


/* Logo */

.entirelogo {
  z-index: 100;
}

.logo {
  position: relative;
  top: 0;
  margin: auto;
  z-index: 105;
}

#conceal {
  width: 100%;
  height: 300px;
  position: absolute;
  top: -50px;
  left: 0;
  background-color: #fff;
  z-index: 104;
}


/* End Logo */


/*                               Navigation                          */

nav {
  width: 100%;
  height: 100px;
  text-align: center;
  position: relative;
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.7)
}

#main_nav {
  position: relative;
  z-index: 103;
}

ul {
  background-color: #FFF;
  margin: 0;
  padding: 0;
  width: 100%;
  -webkit-transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
}

li {
  display: inline;
  font-family: "Lato";
  font-size: 20px;
  text-transform: uppercase;
  display: inline-block;
  margin: 20px 10px;
  padding: 20px 25px 25px 25px;
  z-index: 30;
  position: relative;
  top: 5;
}


/*Dropdown Menu*/

.dropdown {
  display: inline-block;
  cursor: pointer;
  position: relative;
  -webkit-transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
  z-index: 25;
}

.dropbtn {
  padding: 45px 0 35px 0px;
  margin: -45px 40px -35px 40px;
  background-color: #FFF;
}

.dropdown-content {
  visibility: hidden;
  display: block;
  opacity: 1;
  position: absolute;
  top: 150%;
  left: 0;
  width: 100%;
  transform: translateY(-20em);
  z-index: -100;
  transition: all 0.5s ease-in-out 0s, visibility 0s linear 0.5s, z-index 0s linear 0.01s;
}


/* Links inside the dropdown */

.dropdown-content a {
  color: black;
  text-decoration: none;
  font-size: 10px;
  margin: 0px;
  z-index: -250;
}

.dropdown-content li {
  display: block;
  margin: 40px;
  padding: 0px;
  z-index: -250;
}


/*Dropdown links hover */

.dropdown-content a:hover {
  background-color: #f1f1f1;
}


/*Dropdown menu hover */

.dropdown:hover .dropdown-content {
  visibility: visible;
  z-index: -10;
  transform: translateY(0%);
  transition-delay: 0s, 0s, 0.5s;
}


/*Color of dropdown button when dropdown content shown */

.dropdown:hover {
  color: #6d9dc5;
}

#main-nav-scrolled {
  top: 0px;
  width: 100%;
  position: fixed;
}


/*                           End Navigation                          */


/*
font-family: 'Lato', sans-serif;
font-family: 'Fjalla One', sans-serif;
font-family: 'Gloria Hallelujah', cursive;
*/
<html>

<head>
  <title>JAM Bakery</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <link href="https://fonts.googleapis.com/css?family=Fjalla+One|Gloria+Hallelujah|Lato" rel="stylesheet">
  <script>
    var mn = $("main-nav");
    mns = $("main-nav-scrolled");

    $(window).scroll(function() {
      if ($(this).scrollTop() > 275) {
        mn.addClass(mns);
      } else {
        mn.removeClass(mns);
      }
    });
  </script>
</head>

<body>
  <!--Nav-->
  <div class="entirelogo">
    <p id="conceal"></p>
    <center><img class="logo" src="Pictures/Jam_Bakery.png" width="312.5" height="250"></center>
  </div>
  <nav class="main_nav">
    <ul>
      <div class="dropdown">
        <li class="dropbtn">Products</li>
        <ul class=dropdown-content>
          <li><a href="cupcakes.html">Cupcakes</a></li>
          <li><a href="cakes.html">Cakes</a></li>
          <li><a href="bagles.html">Bagles</a>
            <li>
        </ul>
      </div>
      <li class="buttons"><a href="aboutus.html" class="btn">About Us</a></li>
      <li class="buttons"><a href="contactus.html" class="btn">Contact Us</a></li>
    </ul>
  </nav>
  <!--End Nav-->
  <br>
  <div class="content">
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    </p>
  </div>
</body>

</html>

最佳答案

你的上面的代码有很多问题。

首先，您的元素具有类 main_nav，但您正试图用 $("main-nav") 定位它。用 $(".main_nav") 代替。

其次，您尝试添加 main-nav-scrolled 类，它实际上在您的 CSS 中写为 ID (#main-导航滚动)。将其更改为类选择器:

.main-nav-scrolled {
  top: 0px;
  width: 100%;
  position: fixed;
}

最后，您可以直接定位，完全不需要变量:

$(window).scroll(function() {
  if ($(this).scrollTop() > 275) {
    $(".main_nav").addClass('main-nav-scrolled');
  } else {
    $(".main_nav").removeClass('main-nav-scrolled');
  }
});

我已经更新了您的代码以提供工作副本:

body {
  margin: 0px;
  background-color: #fff;
}


/* Logo */

.entirelogo {
  z-index: 100;
}

.logo {
  position: relative;
  top: 0;
  margin: auto;
  z-index: 105;
}

#conceal {
  width: 100%;
  height: 300px;
  position: absolute;
  top: -50px;
  left: 0;
  background-color: #fff;
  z-index: 104;
}


/* End Logo */


/*                               Navigation                          */

nav {
  width: 100%;
  height: 100px;
  text-align: center;
  position: relative;
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.7)
}

#main_nav {
  position: relative;
  z-index: 103;
}

ul {
  background-color: #FFF;
  margin: 0;
  padding: 0;
  width: 100%;
  -webkit-transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
}

li {
  display: inline;
  font-family: "Lato";
  font-size: 20px;
  text-transform: uppercase;
  display: inline-block;
  margin: 20px 10px;
  padding: 20px 25px 25px 25px;
  z-index: 30;
  position: relative;
  top: 5;
}


/*Dropdown Menu*/

.dropdown {
  display: inline-block;
  cursor: pointer;
  position: relative;
  -webkit-transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
  z-index: 25;
}

.dropbtn {
  padding: 45px 0 35px 0px;
  margin: -45px 40px -35px 40px;
  background-color: #FFF;
}

.dropdown-content {
  visibility: hidden;
  display: block;
  opacity: 1;
  position: absolute;
  top: 150%;
  left: 0;
  width: 100%;
  transform: translateY(-20em);
  z-index: -100;
  transition: all 0.5s ease-in-out 0s, visibility 0s linear 0.5s, z-index 0s linear 0.01s;
}


/* Links inside the dropdown */

.dropdown-content a {
  color: black;
  text-decoration: none;
  font-size: 10px;
  margin: 0px;
  z-index: -250;
}

.dropdown-content li {
  display: block;
  margin: 40px;
  padding: 0px;
  z-index: -250;
}


/*Dropdown links hover */

.dropdown-content a:hover {
  background-color: #f1f1f1;
}


/*Dropdown menu hover */

.dropdown:hover .dropdown-content {
  visibility: visible;
  z-index: -10;
  transform: translateY(0%);
  transition-delay: 0s, 0s, 0.5s;
}


/*Color of dropdown button when dropdown content shown */

.dropdown:hover {
  color: #6d9dc5;
}

.main-nav-scrolled {
  top: 0px;
  width: 100%;
  position: fixed;
}


/*                           End Navigation                          */


/*
font-family: 'Lato', sans-serif;
font-family: 'Fjalla One', sans-serif;
font-family: 'Gloria Hallelujah', cursive;
*/
<html>

<head>
  <title>JAM Bakery</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <link href="https://fonts.googleapis.com/css?family=Fjalla+One|Gloria+Hallelujah|Lato" rel="stylesheet">
  <script>
    var mn = $("main-nav");
    mns = "main-nav-scrolled";

    $(window).scroll(function() {
      if ($(this).scrollTop() > 275) {
      $(".main_nav").addClass('main-nav-scrolled');
      } else {
        $(".main_nav").removeClass('main-nav-scrolled');
      }
    });
  </script>
</head>

<body>
  <!--Nav-->
  <div class="entirelogo">
    <p id="conceal"></p>
    <center><img class="logo" src="Pictures/Jam_Bakery.png" width="312.5" height="250"></center>
  </div>
  <nav class="main_nav">
    <ul>
      <div class="dropdown">
        <li class="dropbtn">Products</li>
        <ul class=dropdown-content>
          <li><a href="cupcakes.html">Cupcakes</a></li>
          <li><a href="cakes.html">Cakes</a></li>
          <li><a href="bagles.html">Bagles</a>
            <li>
        </ul>
      </div>
      <li class="buttons"><a href="aboutus.html" class="btn">About Us</a></li>
      <li class="buttons"><a href="contactus.html" class="btn">Contact Us</a></li>
    </ul>
  </nav>
  <!--End Nav-->
  <br>
  <div class="content">
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    </p>
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</body>

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关于jquery - 为什么我的粘性导航不起作用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44147634/

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