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javascript - 如何修复导航栏不显示与 jquery 的粘性

问题描述

我正在使用引导程序 4。我想在 jquery 的帮助下使导航栏保持粘性。所以我添加了一个条件，如果滚动大于或等于 50 我想添加粘性导航栏类，否则删除导航栏粘性类。我在其他项目中使用过类似的东西。但它在这个中不起作用。知道为什么吗？谢谢 ：）

引导程序和 JS

<nav class="navbar navbar-expand-lg fixed-top navbar-custom sticky sticky-dark navbar-light">

    $(window).scroll(function() {
        var scroll = $(window).scrollTop();
        if (scroll >= 50) {
            $(".sticky").addClass("nav-sticky");
        } else {
            $(".sticky").removeClass("nav-sticky");
        }
    });

CSS

.nav-item .nav-link {
  display: inline-block;
  color: #343a40;
  text-decoration: none;
}

.navbar-custom {
  padding: 14px 0px;
  width: 100%;
  border-radius: 0px;
  z-index: 999;
  margin-bottom: 0px;
  -webkit-transition: all 0.5s ease-in-out;
  transition: all 0.5s ease-in-out;
  background-color: transparent;
}

.navbar-custom .logo .logo-dark {
  display: none;
}

.navbar-custom .logo .ligo-light {
  display: inline-block;
}

.navbar-custom .navbar-nav li a {
  line-height: 26px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
  font-weight: 600;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  background-color: transparent !important;
  padding: 6px 0;
  margin: 0 20px;
}

.navbar-custom .navbar-nav li .nav-link {
  padding-right: 0px;
  padding-left: 0px;
}

.navbar-custom .navbar-nav li.active a, .navbar-custom .navbar-nav li a:hover, .navbar-custom .navbar-nav li a:active {
  color: #fff !important;
}

.navbar-custom .navbar-toggles {
  padding: .25rem .75rem;
  font-size: 18px;
  background: 0 0;
  border: 1px solid transparent;
  color: #fff;
  outline: 0;
}

.navbar-toggler {
  font-size: 24px;
  margin-top: 5px;
  margin-bottom: 0px;
  color: #fff;
}

.nav .open > a,
.nav .open > a:focus,
.nav .open > a:hover {
  background-color: transparent;
  border-color: #5e62ff;
}

.menu-toggle {
  padding: 4.5px 10px !important;
}

.menu-toggle span {
  line-height: 27px;
}

/*----- Navbar Sticky -----*/

.nav-sticky.navbar-custom {
  margin-top: 0px;
  background-color: #ffffff;
  -webkit-box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.06);
          box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.06);
  color: #000000 !important;
}

.nav-sticky.navbar-custom .navbar-toggles {
  padding: .25rem .75rem;
  border: 1px solid transparent;
  outline: 0;
}

.nav-sticky.navbar-custom .navbar-nav {
  margin-top: 0px;
}

.nav-sticky.navbar-custom .navbar-nav li a {
  color: #8a8aa0 !important;
}

.nav-sticky.navbar-custom .navbar-nav li.active a, .nav-sticky.navbar-custom .navbar-nav li a:hover, .nav-sticky.navbar-custom .navbar-nav li a:active {
  color: #5e62ff !important;
}

.nav-sticky .logo .logo-dark {
  display: inline-block !important;
}

.nav-sticky .logo .logo-light {
  display: none !important;
}

.navbar-toggler:focus {
  outline: none;
}

.navbar-light .navbar-nav li a {
  color: #8a8aa0 !important;
}

.navbar-light .navbar-nav li.active a, .navbar-light .navbar-nav li a:hover, .navbar-light .navbar-nav li a:active {
  color: #5e62ff !important;
}

@media (min-width: 200px) and (max-width: 768px) {
  .navbar-custom {
    margin-top: 0px;
    background-color: #ffffff !important;
    -webkit-box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    color: #ffffff !important;
  }
  .navbar-custom .navbar-nav {
    margin-top: 0px;
  }
  .navbar-custom .navbar-nav li a {
    -webkit-transition: all 0.4s;
    transition: all 0.4s;
    color: #9b9bae !important;
    margin: 0px;
  }
  .navbar-custom .navbar-nav li.active a {
    border-color: transparent;
  }
  .navbar-custom .navbar-nav li.active a, .navbar-custom .navbar-nav li a:hover, .navbar-custom .navbar-nav li a:active {
    color: #5e62ff !important;
  }
  .navbar-custom > .container {
    width: 90%;
  }
  .navbar-custom .logo .logo-dark {
    display: inline-block !important;
  }
  .navbar-custom .logo .logo-light {
    display: none !important;
  }
  .navbar-custom.navbar-light .navbar-nav li.active a, .navbar-custom.navbar-light .navbar-nav li a:hover, .navbar-custom.navbar-light .navbar-nav li a:active {
    color: #343a40 !important;
  }
  .navbar-toggler {
    font-size: 24px;
    margin-top: 0px;
    margin-bottom: 0px;
    color: #343a40;
  }
  .navbar-collapse {
    padding: 0 20px;
  }
  .navbar-light .nav-item .nav-link:after {
    background: #343a40;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .nav-dark .navbar-nav li a {
    color: #9090a5 !important;
  }
  .nav-dark .navbar-nav li.active a, .nav-dark .navbar-nav li a:hover, .nav-dark .navbar-nav li a:active {
    color: #5e62ff !important;
  }
}

标签： javascriptjquerycssbootstrap-4

解决方案

首先，开始调试以找出问题的根源。使用下面的代码，看看警报框是否正确显示。以便您找出代码的哪一部分不起作用。

 <nav class="navbar navbar-expand-lg fixed-top navbar-custom sticky sticky-dark navbar-light">

  <script>

 $(document).ready(function() {
    $(window).scroll(function() {

        var scroll = $(this).scrollTop();
        console.log($('.nav').data('hola'))
        if (scroll >= 50) {
            $("nav").addClass("nav-sticky");
        } else {
            $("nav").removeClass("nav-sticky");
        }
    });

});
        </script>

这个正在工作。检查 JS Fiddle ( https://jsfiddle.net/rajeevRF/63n8xfz9/15/ )

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