大家好,所以我让我的导航栏在单页导航上工作。但是我想要它,以便当用户向下滚动页面手册时,导航类会更改为哪个应该处于活动状态,因此当它们经过该部分时,导航栏将突出显示活动部分。
点击它可以让它工作,但不能手动滚动
HTML:
<nav class="navbar navbar-default" data-spy="affix" data-offset-top="10">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="#a">a</a></li>
<li><a href="#b">b</a></li>
<li><a href="#c">c</a></li>
<li><a href="#d">d</a></li>
</ul>
</div>
<!--/.nav-collapse -->
</div>
</nav>
<div id="a"></div>
<div id="b"></div>
<div id="c"></div>
<div id="d"></div>
CSS:
affix {
top: 0;
width: 100%
}
.affix + .section {
margin-top: 68px;
}
.navbar {
margin-bottom: 0px;
left: 0;
top: 0;
width: 100%;
list-style: none;
height: 70px;
z-index: 1
}
.navbar-nav {
float: none;
margin: 0;
text-align: center
}
.navbar-nav>li {
float: none;
display: inline-block
}
.navbar-nav>li>a {
line-height: 38px
}
.navbar-nav>li>a.active {
background-color: #E7E7E7
}
.navbar-default .navbar-nav>li>a:hover, .navbar-default .navbar-nav>li>a:focus {
color: #333333;
background-color: #E7E7E7
}
.navbar-toggle {
background-color: #000000;
background-image: none;
border-radius: 4px;
float: right;
margin-bottom: 8px;
margin-right: 15px;
margin-top: 18px;
padding: 9px 10px;
position: relative
}
.navbar-inverse .navbar-toggle .icon-bar {
background-color: #2DCC70
}
.navbar-default .navbar-toggle:hover, .navbar-default .navbar-toggle:focus {
background-color: #000000
}
.navbar-inverse .navbar-collapse, .navbar-inverse .navbar-form {
border-color: transparent
}
#a{
height: 700px;
background-color: Red;
}
#b{
height: 700px;
background-color: blue;
}
#c{
height: 700px;
background-color: yellow;
}
#d{
height: 700px;
background-color: black;
}
JS:
$(function() {
$('ul.nav a').bind('click',function(event){
event.preventDefault();
var $anchor = $(this);
//Update active link
$('ul.nav a').removeClass('active');
$anchor.addClass('active');
//Animate scroll position
$('html, body').stop().animate({
scrollTop: $($anchor.attr('href')).offset().top
}, 1000);
});
});
答案 0 :(得分:1)
您可以使用scrollspy执行此操作。名为Waypoints的Javascript库是另一种可能性。
以下是如何使用Waypoint的示例:
function makeNavActive($elem) {
if (typeof $elem !== "jQuery") {
$elem = $($elem);
}
$('ul.nav a').removeClass('active');
$elem.addClass('active');
}
function waypointHandler() {
var elementID = this.element.id;
makeNavActive("[href='#" + elementID + "']");
}
var waypointA = new Waypoint({
element: document.getElementById('a'),
handler: waypointHandler,
offset: 38
});
var waypointB = new Waypoint({
element: document.getElementById('b'),
handler: waypointHandler,
offset: 38
});
var waypointC = new Waypoint({
element: document.getElementById('c'),
handler: waypointHandler,
offset: 38
});
var waypointAD = new Waypoint({
element: document.getElementById('d'),
handler: waypointHandler,
offset: 38
});
我确信你可以创建一种更好的方法来设置航点,但这只是一个例子。
有点乐趣我也创造了一种在香草JS中做到这一点的方法。所以这里有一个很好的轻量级vanilla实现,虽然不如使用waypoint灵活:
function makeNavActive($elem) {
if (typeof $elem !== "jQuery") {
$elem = $($elem);
}
$('ul.nav a').removeClass('active');
$elem.addClass('active');
}
function handleScroll(){
var scrollLevel = Math.floor(window.pageYOffset / 700);
console.log(scrollLevel);
if(scrollLevel === 0) {makeNavActive("[href='#a']")}
else if(scrollLevel === 1) {makeNavActive("[href='#b']")}
else if(scrollLevel === 2) {makeNavActive("[href='#c']")}
else if(scrollLevel === 3) {makeNavActive("[href='#d']")}
}
window.onscroll=handleScroll
希望有所帮助!祝你的项目好运。