javascript - Navbar Menu如何实现平滑的下滑效果

Question

目标 - 我想在滚动后实现向下滑动(对于导航栏)效果。我实际上实现了我想要的，但是我遇到了问题。

问题 - 当向上滚动到顶部时，导航栏变得粘滞而没有任何效果，它有点吸引人。谁能帮我解决这个问题？

您可以在此处查看我的代码 Codepen .

// Sticky Header
$(window).scroll(function() {
    if ($(window).scrollTop() > 100) {
        $('#header').addClass('sticky-header');
        $('#header .mo-row').removeClass('sticky-border');
    } else {
        $('#header').removeClass('sticky-header');
        $('#header .mo-row').addClass('sticky-border');
    }
});

var sidebarBox = document.querySelector('#box');
var sidebarBtn = document.querySelector('#btn');
var pageWrapper = document.querySelector('#main-content');

sidebarBtn.addEventListener('click', function(event) {

  if (this.classList.contains('active')) {
      this.classList.remove('active');
      sidebarBox.classList.remove('active');
  } else {
      this.classList.add('active');
      sidebarBox.classList.add('active');
  }
});

// accordion js

$(document).ready(function() {
    function close_accordion_section() {
        $('.accordion .accordion-section-title').removeClass('active2');
        $('.accordion .accordion-section-content').slideUp(300).removeClass('open');
    }

    $('.accordion-section-title').click(function(e) {
        // Grab current anchor value
        var currentAttrValue = $(this).attr('href');

        if($(e.target).is('.active2')) {
            close_accordion_section();
        }else {
            close_accordion_section();

            // Add active class to section title
            $(this).addClass('active2');

            // Open up the hidden content panel
            $('.accordion ' + currentAttrValue).slideDown(300).addClass('open');
        }
        e.preventDefault();
    });
});

html {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 1000px;
  -webkit-font-smoothing: antialiased;
  font-family: 'Lato', sans-serif;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

ul, li {
  margin: 0;
  padding: 0;
  list-style: none;
}

img {
  vertical-align: middle;
}

a {
  text-decoration: none;
}

.mo-container {
  width: 100%;
  max-width: 1250px;
  margin: 0 auto;
  z-index: 999;
  position: relative;
}

.mo-row {
  width: 95%;
  margin: 0 auto;
}

.mo-grid:before,
.mo-grid:after,
.mo-row:before,
.mo-row:after {
  content: " ";
  display: table;
}

.mo-grid:after,
.mo-row:after {
  clear: both;
}

[class*='col-'] {
  width: 100%;
  float: left;
  min-height: 1px;
}

.col {
  margin: 10px;
}

@media screen and (min-width: 320px) {
  .col-sm-1 {
    width: 8.33333%;
  }

  .col-sm-2 {
    width: 16.66667%;
  }

  .col-sm-3 {
    width: 25%;
  }

  .col-sm-4 {
    width: 33.33333%;
  }

  .col-sm-5 {
    width: 41.66667%;
  }

  .col-sm-6 {
    width: 50%;
  }

  .col-sm-7 {
    width: 58.33333%;
  }

  .col-sm-8 {
    width: 66.66667%;
  }

  .col-sm-9 {
    width: 75%;
  }

  .col-sm-10 {
    width: 83.33333%;
  }

  .col-sm-11 {
    width: 91.66667%;
  }

  .col-sm-12 {
    width: 100%;
  }
}
@media screen and (min-width: 768px) {
  .col-md-1 {
    width: 8.33333%;
  }

  .col-md-2 {
    width: 16.66667%;
  }

  .col-md-3 {
    width: 25%;
  }

  .col-md-4 {
    width: 33.33333%;
  }

  .col-md-5 {
    width: 41.66667%;
  }

  .col-md-6 {
    width: 50%;
  }

  .col-md-7 {
    width: 58.33333%;
  }

  .col-md-8 {
    width: 66.66667%;
  }

  .col-md-9 {
    width: 75%;
  }

  .col-md-10 {
    width: 83.33333%;
  }

  .col-md-11 {
    width: 91.66667%;
  }

  .col-md-12 {
    width: 100%;
  }
}
@media screen and (min-width: 992px) {
  .col-lg-1 {
    width: 8.33333%;
  }

  .col-lg-2 {
    width: 16.66667%;
  }

  .col-lg-3 {
    width: 25%;
  }

  .col-lg-4 {
    width: 33.33333%;
  }

  .col-lg-5 {
    width: 41.66667%;
  }

  .col-lg-6 {
    width: 50%;
  }

  .col-lg-7 {
    width: 58.33333%;
  }

  .col-lg-8 {
    width: 66.66667%;
  }

  .col-lg-9 {
    width: 75%;
  }

  .col-lg-10 {
    width: 83.33333%;
  }

  .col-lg-11 {
    width: 91.66667%;
  }

  .col-lg-12 {
    width: 100%;
  }
}
.hello-bar {
  height: 40px;
  line-height: 39px;
  background: #52ae56;
  text-align: center;
  color: #fff;
}

.hello-bar a {
  color: #fff;
  text-transform: uppercase;
  font-size: 12px;
}

.hello-bar a span {
  font-weight: bold;
}

.sticky-header {
  background-color: #fff !important;
  box-shadow: 0 2px 4px 0 rgba(87, 71, 81, 0.2);
  height: 65px;
  line-height: 65px;
  position: fixed !important;
  top: 0;
  -webkit-animation-name: slidedown;
  animation-name: slidedown;
  -webkit-animation-duration: .5s;
  animation-duration: .5s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform: translate3d(0, 0, 0);
  -ms-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

@-webkit-keyframes slidedown {
  0% {
    opacity: 0;
    -webkit-transform: translateY(-400px);
    transform: translateY(-400px);
  }
  100% {
    -webkit-transform: translateY(0);
    transform: translateY(0);
  }
}
@keyframes slidedown {
  0% {
    -webkit-transform: translateY(-400px);
    -ms-transform: translateY(-400px);
    transform: translateY(-400px);
  }
  100% {
    -webkit-transform: translateY(0);
    -ms-transform: translateY(0);
    transform: translateY(0);
  }
}
.sticky-border {
  border-bottom: 1px solid #e8e8e8;
}

#header-sec {
  position: relative;
  z-index: 9999999;
  height: 65px;
  line-height: 65px;
  /* Fold Out */
  /* accordion css */
}
#header-sec #header {
  background-color: transparent;
  width: 100%;
  height: 66px;
  line-height: 64px;
  position: absolute;
}
#header-sec #header .navbar-logo {
  height: 65px;
  line-height: 65px;
  cursor: pointer;
}
#header-sec #header .navbar-logo img {
  height: 75px;
  margin-top: -4px;
  margin-left: -17px;
}
#header-sec .nav ul {
  background-color: transparent;
}
#header-sec .nav ul > li {
  display: inline-block;
  position: relative;
}
#header-sec .nav a {
  display: block;
  padding: 10px 18px 10px 15px;
  font-size: 0.9em;
  line-height: 1.2em;
  color: #0d1739;
  font-weight: 400;
}
#header-sec .nav a:hover {
  text-decoration: none;
}
#header-sec .nav li ul {
  background-color: #fff;
}
#header-sec .nav li ul li {
  width: 200px;
  display: block;
  text-align: left;
}
#header-sec .nav li ul a {
  border: none;
  color: #333;
}
#header-sec .nav li ul a:hover {
  background: #333;
  color: #fff;
}
#header-sec .nav li ul {
  position: absolute;
  left: 0;
  top: 52px;
  z-index: 1;
  max-height: 0;
  overflow: hidden;
  -webkit-transform: perspective(400) rotate3d(1, 0, 0, -90deg);
  -webkit-transform-origin: 50% 0;
  -webkit-transition: 350ms;
  -moz-transition: 350ms;
  -o-transition: 350ms;
  transition: 350ms;
}
#header-sec .nav ul > li:hover ul {
  max-height: 1000px;
  -webkit-transform: perspective(400) rotate3d(0, 0, 0, 0);
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.27);
}
#header-sec .accordion-section-content li {
  background: #fff;
  padding: 10px 30px;
  border-bottom: 1px solid #f6f6f6;
  border-left: 1px solid #f6f6f6;
}
#header-sec .accordion-section-content li:hover {
  background-color: rgba(52, 56, 56, 0.2);
}
#header-sec .accordion-section-content li:last-child {
  border-bottom: none;
}
#header-sec a {
  color: #343838;
}
#header-sec #box {
  position: fixed;
  z-index: 4;
  overflow: auto;
  top: 0px;
  right: -250px;
  width: 250px;
  opacity: 0;
  padding: 20px 0px;
  height: 100%;
  background-color: #f6f6f6;
  color: #343838;
  -webkit-transition: all 350ms cubic-bezier(0.6, 0.05, 0.28, 0.91);
  transition: all 350ms cubic-bezier(0.6, 0.05, 0.28, 0.91);
}
#header-sec #box.active {
  right: 0px;
  opacity: 1;
}
#header-sec #items {
  position: relative;
  top: 8.7%;
  line-height: normal;
}
#header-sec #items .item {
  position: relative;
  cursor: pointer;
  font-size: 1em;
  /* originally 2ems  */
  padding: 10px 20px;
  -webkit-transition: all 250ms;
  transition: all 250ms;
}
#header-sec #items .item:hover {
  padding: 10px 20px;
  background-color: rgba(52, 56, 56, 0.2);
}
#header-sec #btn {
  position: absolute;
  z-index: 5;
  top: 22px;
  right: 9px;
  cursor: pointer;
  -webkit-transition: left 500ms cubic-bezier(0.6, 0.05, 0.28, 0.91);
  transition: left 500ms cubic-bezier(0.6, 0.05, 0.28, 0.91);
}
#header-sec #btn div {
  width: 30px;
  height: 2px;
  margin-bottom: 7px;
  background-color: #1d1f20;
  -webkit-transition: -webkit-transform 500ms cubic-bezier(0.6, 0.05, 0.28, 0.91), opacity 500ms, box-shadow 250ms, background-color 500ms;
  transition: transform 500ms cubic-bezier(0.6, 0.05, 0.28, 0.91), opacity 500ms, box-shadow 250ms, background-color 500ms;
}
#header-sec #btn.active {
  right: 9px;
}
#header-sec #btn.active div {
  background-color: #343838;
}
#header-sec #btn.active #top {
  -webkit-transform: translateY(10px) rotate(-135deg);
  -ms-transform: translateY(10px) rotate(-135deg);
  transform: translateY(10px) rotate(-135deg);
}
#header-sec #btn.active #middle {
  -webkit-transform: scale(0);
  -ms-transform: scale(0);
  transform: scale(0);
}
#header-sec #btn.active #bottom {
  -webkit-transform: translateY(-10px) rotate(-45deg);
  -ms-transform: translateY(-10px) rotate(-45deg);
  transform: translateY(-10px) rotate(-45deg);
}
#header-sec .accordion {
  overflow: hidden;
  line-height: normal;
}
#header-sec .accordion-section-title {
  cursor: pointer;
  width: 100%;
  transition: all linear 0.15s;
  -webkit-transition: all linear 0.15s;
  -moz-transition: all linear 0.15s;
  -ms-transition: all linear 0.15s;
  -o-transition: all linear 0.15s;
  position: relative;
  display: block;
  padding: 10px 20px;
}
#header-sec .accordion-section-title:hover {
  padding: 10px 20px;
  background-color: rgba(52, 56, 56, 0.2);
}
#header-sec .accordion-section-content {
  display: none;
  background: #f0f0f0;
}
#header-sec .active2, #header-sec .open {
  display: block;
}
#header-sec #box, #header-sec #btn {
  display: none;
}
@media screen and (max-width: 992px) {
  #header-sec .navbar-menu {
    display: none;
  }
  #header-sec #box, #header-sec #btn {
    display: block;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="hello-bar">
    <div class="container">
        <div class="row">
            <div class="col-sm-12">
                <a class="try_it_for_free_event_gtm" onclick="ga('send', 'event', 'TryForFree', 'TryForFree-clicked', 'TryForFree')" href="http://info.moengage.com/push-amplification/?utm_source=homepage&utm_medium=ribbon">Introducing <span>MoEngage Push Amplification</span>: Industry-First Solution for Push Delivery Issues
                 &nbsp;&nbsp;&nbsp;<img src="img/notification.png" alt="" style="width: 17px;"></a>
            </div>
        </div>
    </div>
</div>

<section id="header-sec">
    <header id="header">
        <div class="mo-container">
            <div class="mo-row sticky-border">
                <nav class="col-sm-6 col-md-4 col-lg-2">
                    <div class="navbar-logo">
                        <img src="img/logo-dark.png" alt="">
                    </div>
                </nav>

                <nav class="col-sm-6 col-md-8 col-lg-10 text-right">
                    <div class="navbar-menu nav">
                        <ul>
                            <li>
                                <a href="">Product &nbsp;<i class="fa fa-angle-down" aria-hidden="true"></i></a>
                                <ul>
                                    <li><a href="#">Flows</a></li>
                                    <li><a href="#">Web Push</a></li>
                                    <li><a href="#">Email Campaigns</a></li>
                                    <li><a href="#">In-app Nativ</a></li>
                                    <li><a href="#">User Intelligence</a></li>
                                    <li><a href="#">Engagement Platform</a></li>
                                    <li><a href="#">Smart Triggers</a></li>
                                </ul>
                            </li>

                            <li>
                                <a href="">Customers &nbsp;<i class="fa fa-angle-down" aria-hidden="true"></i></a>
                                <ul>
                                    <li><a href="#">Customer Stories</a></li>
                                    <li><a href="#">Help &amp; Support</a></li>
                                    <li><a href="#">Developers Docs</a></li>
                                </ul>
                            </li>

                            <li>
                                <a href="">Company &nbsp;<i class="fa fa-angle-down" aria-hidden="true"></i></a>
                                <ul>
                                    <li><a href="">About</a></li>
                                    <li><a href="">Blog</a></li>
                                    <li><a href="">Jobs</a></li>
                                </ul>
                            </li>

                            <li><a href="">Pricing</a></li>
                            <li><a href="">Login</a></li>
                            <li><a href="">Sign Up</a></li>
                            <li>
                                <a href="" style="padding-right: 0;">
                                    <button class="button primary">Free Demo</button>
                                </a>
                            </li>
                        </ul>
                    </div>

                    <div id="box">
                        <div id="items">
                            <div class="accordion">
                                <div class="accordion-section">
                                    <a class="accordion-section-title" href="#accordion-1">
                                        Product &nbsp;<i class="fa fa-angle-down" aria-hidden="true"></i>
                                    </a>
                                    <div id="accordion-1" class="accordion-section-content">
                                        <ul>
                                            <li><a href="#">Flows</a></li>
                                            <li><a href="#">Web Push</a></li>
                                            <li><a href="#">Email Campaigns</a></li>
                                            <li><a href="#">In-app Nativ</a></li>
                                            <li><a href="#">User Intelligence</a></li>
                                            <li><a href="#">Engagement Platform</a></li>
                                            <li><a href="#">Smart Triggers</a></li>
                                        </ul>
                                    </div>
                                </div>
                            </div>
                            <div class="accordion">
                                <div class="accordion-section">
                                    <a class="accordion-section-title" href="#accordion-2">
                                      Customers &nbsp;<i class="fa fa-angle-down" aria-hidden="true"></i>
                                    </a>
                                    <div id="accordion-2" class="accordion-section-content">
                                        <ul>
                                            <li><a href="">About</a></li>
                                            <li><a href="">Blog</a></li>
                                            <li><a href="">Jobs</a></li>
                                        </ul>
                                    </div>
                                </div>
                            </div>
                            <div class="accordion">
                                <div class="accordion-section">
                                    <a class="accordion-section-title" href="#accordion-3">
                                      Company &nbsp;<i class="fa fa-angle-down" aria-hidden="true"></i>
                                    </a>
                                    <div id="accordion-3" class="accordion-section-content">
                                        <ul>
                                            <li><a href="">About</a></li>
                                            <li><a href="">Blog</a></li>
                                            <li><a href="">Jobs</a></li>
                                        </ul>
                                    </div>
                                </div>
                            </div>
                            <div class="item">Pricing</div>
                            <div class="item">Login</div>
                            <div class="item">Sign Up</div>
                        </div>
                    </div>

                    <div id="btn">
                        <div id="top"></div>
                        <div id="middle"></div>
                        <div id="bottom"></div>
                    </div>
                </nav>
            </div>
        </div>
    </header>
</section>

Answer 1

所以我更改了您的粘性标题 JS，以在向上滚动时添加一个类，并在从顶部滚动 200 像素后添加一个显示类。

JS

 // Sticky Header
 jQuery(window).scroll(function() {    
     var scroll = jQuery(window).scrollTop();
     if (scroll > 200) {
         jQuery("#header").addClass("show");
     } else {
         jQuery("#header").removeClass("show");
     }
 });

 var lastScrollTop = 0;
 jQuery(window).scroll(function(event){
 var st = jQuery(this).scrollTop();
    if (st > lastScrollTop){
        jQuery("#header").removeClass("up");
    } else {
       jQuery("#header").addClass("up");
    }
    lastScrollTop = st;
 });

然后添加CSS

    #header-sec #header,
    #header-sec #header.up{
          position: absolute;
          top: 0;
          -webkit-transition: top 500ms ease-out ;
           -moz-transition: top 500ms ease-out ;
           -o-transition: top 500ms ease-out ;
           transition: top 500ms ease-out ;
    }
    #header-sec #header.show {
     position: fixed !important;
      top: 0;
      -webkit-animation-name: slidedown;
      animation-name: slidedown;
      -webkit-animation-duration: .5s;
      animation-duration: .5s;
      -webkit-animation-fill-mode: both;
      animation-fill-mode: both;
      -webkit-transform: translate3d(0, 0, 0);
      -moz-transform: translate3d(0, 0, 0);
      -ms-transform: translate3d(0, 0, 0);
      -o-transform: translate3d(0, 0, 0);
      transform: translate3d(0, 0, 0);
    }
    #header-sec #header.up.show {
         position: fixed !important;
         top: 0;
        -webkit-animation-name: slideup;
        animation-name: slideup;
        -webkit-animation-duration: .5s;
        animation-duration: .5s;
       -webkit-animation-fill-mode: both;
      animation-fill-mode: both;
      -webkit-transform: translate3d(0, 0, 0);
      -moz-transform: translate3d(0, 0, 0);
      -ms-transform: translate3d(0, 0, 0);
      -o-transform: translate3d(0, 0, 0);
       transform: translate3d(0, 0, 0);
    }
    @-webkit-keyframes slideup {
      0% {
        opacity: 0;
        -webkit-transform: translateY(0);
        transform: translateY(0);
      }
      100% {
        -webkit-transform: translateY(-400px);
        transform: translateY(-400px);
      }
    }
    @keyframes slideup {
      0% {
        -webkit-transform: translateY(0);
        -ms-transform: translateY(0);
        transform: translateY(0);
     }
      100% {
        -webkit-transform: translateY(-400px);
       -ms-transform: translateY(-400px);
        transform: translateY(-400px);
      }
    }

希望你能用上这个