Question

任何向下滚动的内容都会使导航栏消失，而我不希望那样。我只希望它在滚动时消失。我试过删除滚动对象上所有对象的滚动功能。已经坚持了几天。我知道为什么会这样做，因为我具有内置功能，可以使导航栏向下滚动时消失。但是，仅在单击时，我不希望这种情况发生-我希望导航保持不变。

任何帮助将不胜感激。坚持了几天。不确定如何从窗口中删除滚动事件以使其正常工作。

'use strict';
var section = document.querySelectorAll(".section");
var sections = {};
var i = 0;

const arr = Array.from(section)
arr.forEach(function(el) {
  sections[el.id] = el.offsetTop;
});

window.onscroll = function() {
  var scrollPosition = document.documentElement.scrollTop || document.body.scrollTop;

  for (i in sections) {
    if (sections[i] <= scrollPosition) {
      document.querySelector('.active').setAttribute('class', ' ');
      document.querySelector('a[href*=' + i + ']').setAttribute('class', 'active');
    }
  }
};


var nav = document.querySelector('.nav');
var navText = document.querySelectorAll(".links");

function scrolling() {
  // Initial state
  var scrollPos = 0;
  // adding scroll event
  addEventListener('scroll', function(e) {
    // detects new state and compares it with the old one
    if ((document.body.getBoundingClientRect()).top > scrollPos)
      nav.style.visibility = "visible"
    if ((document.body.getBoundingClientRect()).top < scrollPos)
      nav.style.visibility = "hidden"
    // saves the new position for iteration.
    scrollPos = (document.body.getBoundingClientRect()).top;
  });
}

scrolling();

body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  font: 24px 'Roboto', sans-serif;
  background: url("images/someTree.jpg") no-repeat;
  background-size: cover;
}

header {
  opacity: 0.9;
  width: 100%;
  height: 85px;
  position: fixed;
  z-index: 1000;
  background-color: #96C339;
}

header h1#logo {
  float: left;
  font-family: "Roboto", sans-serif;
  font-size: 40px;
  color: #FFF;
  font-weight: 400;
  margin-left: 35px;
}

header nav {
  display: inline-block;
  float: right;
}

header nav a {
  line-height: 100px;
  margin-left: 20px;
  margin-right: 20px;
  color: #FFF;
  font-weight: 700;
  font-size: 20px;
  text-decoration: none;
}

a {
  font-family: 'Droid Sans', serif;
  color: white;
  text-decoration: none;
  line-height: 40px;
}

.active {
  font-family: 'Droid Sans', serif;
  font-size: 22px;
  color: #000;
  text-decoration: none;
  line-height: 40px;
}

#about {
  background-color: #fff;
  height: 100vh;
  width: 100vw;
  opacity: 0.6;
}

#skills {
  background-color: #fff;
  height: 100vh;
  width: 100vw;
  opacity: 0.6;
}

#contact {
  background-color: #fff;
  height: 100vh;
  width: 100vw;
  opacity: 0.6;
}

@media all and (max-width: 770px) {
  header h1#logo {
    font-size: 30px;
    display: block;
    float: none;
    margin: 0 auto;
    height: 100px;
    line-height: 55px;
    text-align: center;
  }
  header nav {
    display: block;
    float: none;
    height: 50px;
    text-align: center;
    margin: 0 auto;
    margin-top: -65px;
  }
  header nav a {
    font-size: 15px;
    line-height: 50px;
    margin: 0 5px;
  }
}

<link rel="stylesheet" href="portfolio.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto">
<div class="wrapper">
  <header class="nav">
    <h1 id="logo">DMac</h1>
    <nav>
      <a href="#about" class="active">About</a>
      <a href="#skills">Skills</a>
      <a href="#contact">Contact</a>
    </nav>
  </header>
  <div id="about" class="section"></div>
  <div id="skills" class="section"></div>
  <div id="contact" class="section"></div>

Answer 1

我通过在较早的项目之一中使用Bootstrap实现了这一目标。如果要使用引导程序，则可以在单击或滚动时使用“固定顶层类”对其进行修复。您可以在这里找到更多信息；

[https://getbootstrap.com/docs/4.1/utilities/position/#fixed-top][1]

当用户单击导航链接时，如何使导航栏停止消失？

1 个答案: