[英]Navigation have an active class working
大家好,我讓我的導航欄在一頁導航上工作。 但是我想要它,以便當用戶向下滾動頁面手冊時,導航類更改為應該處於活動狀態的類別,因此當他們經過該部分時,導航欄將突出顯示活動部分。
當他們點擊它時我可以讓它工作,但不能手動滾動
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);
});
});
你可以用scrollspy做到這一點。 稱為Waypoints的 Javascript 庫是另一種可能性。
以下是如何使用航點的示例:
function makeNavActive($elem) {
if (typeof $elem !== "jQuery") {
$elem = $($elem);
}
$('ul.nav a').removeClass('active');
$elem.addClass('active');
}
function waypointHandler() {
var elementID = this.element.id;
makeNavActive("[href='#" + elementID + "']");
}
var waypointA = new Waypoint({
element: document.getElementById('a'),
handler: waypointHandler,
offset: 38
});
var waypointB = new Waypoint({
element: document.getElementById('b'),
handler: waypointHandler,
offset: 38
});
var waypointC = new Waypoint({
element: document.getElementById('c'),
handler: waypointHandler,
offset: 38
});
var waypointAD = new Waypoint({
element: document.getElementById('d'),
handler: waypointHandler,
offset: 38
});
我相信你可以創建一種更好的方式來設置航點,但這將作為一個例子。
有點好玩,我還創建了一種在 vanilla JS 中執行此操作的方法。 所以這是一個很好的輕量級香草實現,雖然不如使用航點靈活:
function makeNavActive($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
希望有幫助! 祝你的項目好運。
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