当用户向上/向下滚动时隐藏/显示导航栏
以下是我想要实现的示例: http://haraldurthorleifsson.com/ 要么 http://www.teehanlax.com/story/readability/
向下滚动时,导航栏会在屏幕上向上滑动,向上滚动时会在屏幕上向下滑动。我已经想出了如何使用淡入/淡出来实现它,但我想用与示例中完全相同的动画来实现它。 注意:我已经尝试过SlideIn(),就像它进行拉伸动画一样......
JQUERY:
var previousScroll = 0,
headerOrgOffset = $('#header').offset().top;
$('#header-wrap').height($('#header').height());
$(window).scroll(function() {
var currentScroll = $(this).scrollTop();
console.log(currentScroll + " and " + previousScroll + " and " + headerOrgOffset);
if(currentScroll > headerOrgOffset) {
if (currentScroll > previousScroll) {
$('#header').fadeOut();
} else {
$('#header').fadeIn();
$('#header').addClass('fixed');
}
} else {
$('#header').removeClass('fixed');
}
previousScroll = currentScroll;
});
CSS:
#header {
width: 100%;
z-index: 100;
}
.fixed {
position: fixed;
top: 0;
}
#header-wrap {
position: relative;
}
HTML:
<div id="header-wrap">
<div id="header" class="clear">
<nav>
<h1>Prototype</h1>
</nav>
</div>
</div>
答案 0 :(得分:14)
要使导航的内部内容向上滑动而不是逐步隐藏,您需要在父元素上执行动画,并将内部元素保留在父元素的底部,如下所示:
<div id="header-wrap">
<div id="header" class="clear">
<nav><h1>Prototype</h1>another line<br/>another line
</nav>
</div>
</div>
CSS
body {
height: 1000px;
}
#header {
width: 100%;
position: absolute;
bottom: 0;
}
#header-wrap {
width: 100%;
position: fixed;
background-color: #e0e0e0;
}
JS
var previousScroll = 0,
headerOrgOffset = $('#header').height();
$('#header-wrap').height($('#header').height());
$(window).scroll(function () {
var currentScroll = $(this).scrollTop();
if (currentScroll > headerOrgOffset) {
if (currentScroll > previousScroll) {
$('#header-wrap').slideUp();
} else {
$('#header-wrap').slideDown();
}
} else {
$('#header-wrap').slideDown();
}
previousScroll = currentScroll;
});
答案 1 :(得分:2)
你试过动画吗?但用导航栏的高度替换-60px
。但是否定。
$(window).scroll(function() {
var currentScroll = $(this).scrollTop();
console.log(currentScroll + " and " + previousScroll + " and " + headerOrgOffset);
if(currentScroll > headerOrgOffset) {
if (currentScroll > previousScroll) {
$('#header').animate({
top: '-60px' //Change to Height of navbar
}, 250); //Mess with animate time
} else {
$('#header').animate({
top: '0px'
},250);
$('#header').addClass('fixed');
}
} else {
$('#header').removeClass('fixed');
}
previousScroll = currentScroll;
});
答案 2 :(得分:2)
无论您使用哪种navbar
元素,都必须在其上加transition: transform 0.3s
,基数transform
为0。
#navbar {
position: fixed;
right: 0; left: 0; top: 0;
/* your height */
height: 40px;
/* .... */
-webkit-transform: translate3d(0,0,0);
-moz-transform: translate3d(0,0,0);
transform: translate3d(0,0,0);
-webkit-transition: -webkit-transform .3s;
-moz-transition: -moz-transform .3s;
-o-transition: transform .3s;
transition: transform .3s;
}
#navbar.scrolled {
/* subtract your height */
-webkit-transform: translate3d(0,-40px,0);
-moz-transform: translate3d(0,-40px,0);
transform: translate3d(0,-40px,0);
}
然后你的javascript需要观看用户的滚动:
;(function (){
var previousScroll = 0;
var navbar = document.getElementById('navbar'),
navClasses = navbar.classList; // classList doesn't work <IE10
window.addEventListener('scroll', function(e){
var currentScroll = window.scrollY;
var isDown = currentScroll > previousScroll;
if ( isDown && !navClasses.contains('scrolled') ){
// scrolling down, didn't add class yet
navClasses.add('scrolled'); // we hide the navbar
} else if ( !isDown ){
// scrolling up
navClasses.remove('scrolled'); // won't error if no class found
}
// always update position
previousScroll = currentScroll;
});
}()); //run this anonymous function immediately
答案 3 :(得分:0)
答案 4 :(得分:0)
@media(min-width: 1079px){
#header{
width:100%;
height:82px;
border:1px solid grey;
background-color: lightgreen;
margin:0 auto;
position:fixed;
transition-property: all;
transition-duration: 0.3s;
transition-delay: 0s;
transition-timing-function: ease-out;
}
nav{
display: flex;
justify-content: space-between;
}
nav .nav1{
list-style-type: none;
padding: 0px;
}
nav a{
text-decoration: none;
color:grey;
padding: 13px;
display: block;
color: grey;
margin-top: 15px;
}
a{
text-decoration: none !important;
}
nav a:hover{
color: red;
}
nav .nav1{
display: flex;
justify-content: flex-end;
}
.row2{
background-color: skyblue;
height:2000px;
margin-top: 82px;
}
}
<!DOCTYPE html>
<html>
<head>
<title>header2</title>
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<link rel="stylesheet" href="css/header-larger1.css">
</head>
<body>
<!--<div id="header">-->
<nav>
<ul class="nav1" id="header">
<li><a href="">HOME</a></li>
<li><a href="">ABOUT</a></li>
<li><a href="">INFO</a></li>
<li><a href="">DISCOUNTS</a></li>
<li><a href="">BUSINESS</a></li>
<li><a href="">BLOG</a></li>
<li><a href="">CONTACT</a></li>
</ul>
</nav>
<!--</div>-->
<div class="container row2">
<h3>this is row2</h3>
</div>
</body>
<script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
<script type="text/javascript" src="js/head1.js"></script>
</html>
function fun1()
{
var documentElem=$(document),
lastScrollTop=0;
scrollabc=80;
documentElem.on('scroll',function()
{
var currentScrollTop=$(this).scrollTop();
console.log(window.pageYOffset);
if(currentScrollTop > scrollabc)
{
if(currentScrollTop>lastScrollTop)
{
//nav.addClass('hidden');
document.getElementById("header").style.marginTop = "-80px";
console.log("first if block");
}
else
{
// nav.removeClass('hidden');
document.getElementById("header").style.marginTop = "0px";
console.log("2nd if block");
}
}
lastScrollTop=currentScrollTop;
})
}
fun1();
答案 5 :(得分:0)
我发现了@Dom Day所写的Saijo George的相似且更简单的实现。
注意:我重命名了Saijo的变量,以便于阅读。
CSS
/* This class will be attached to your nav by the below */
.scrollUp {
transform: translateY(-100%);
}
jQuery
const navbar = document.querySelector("nav"); //Select your nav element here
let previousScroll = 0;
$(window).scroll(function handleNav() {
let currentScroll = $(window).scrollTop(); //Distance scrolled down the page
let navHeight = $(navbar).height(); //Height of navbar
//When scrolling down AND you've scrolled past navHeight * 2.25, add .scrollUp
if (currentScroll > previousScroll && currentScroll > navHeight * 2.25) {
$(navbar).addClass("scrollUp");
//When scrolling up AND you've scrolled less than navHeight, remove .scrollUp
} else if (previousScroll > currentScroll && !(currentScroll <= navHeight)) {
$(navbar).removeClass("scrollUp");
}
previousScroll = currentScroll;
});