我正在使用我在这个答案Change Active Menu Item on Page Scroll?中找到的代码,但无法使其工作......这就是我从jsFiddle示例中粘贴的内容。
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script>
// Cache selectors
var lastId,
topMenu = $("#top-menu"),
topMenuHeight = topMenu.outerHeight()+15,
// All list items
menuItems = topMenu.find("a"),
// Anchors corresponding to menu items
scrollItems = menuItems.map(function(){
var item = $($(this).attr("href"));
if (item.length) { return item; }
});
// Bind click handler to menu items
// so we can get a fancy scroll animation
menuItems.click(function(e){
var href = $(this).attr("href"),
offsetTop = href === "#" ? 0 : $(href).offset().top-topMenuHeight+1;
$('html, body').stop().animate({
scrollTop: offsetTop
}, 300);
e.preventDefault();
});
// Bind to scroll
$(window).scroll(function(){
// Get container scroll position
var fromTop = $(this).scrollTop()+topMenuHeight;
// Get id of current scroll item
var cur = scrollItems.map(function(){
if ($(this).offset().top < fromTop)
return this;
});
// Get the id of the current element
cur = cur[cur.length-1];
var id = cur && cur.length ? cur[0].id : "";
if (lastId !== id) {
lastId = id;
// Set/remove active class
menuItems
.parent().removeClass("active")
.end().filter("[href=#"+id+"]").parent().addClass("active");
}
});
</script>
<style>
body {
height: 6000px;
font-family: Helvetica, Arial;
}
#top-menu {
position: fixed;
z-index: 1;
background: white;
left: 0;
right: 0;
top: 0;
}
#top-menu li {
float: left;
}
#top-menu a {
display: block;
padding: 5px 25px 7px 25px;
-webkit-transition: 1s all ease;
-moz-transition: 1s all ease;
transition: 1s all ease;
border-top: 3px solid white;
color: #666;
text-decoration: none;
}
#top-menu a:hover {
color: #000;
}
#top-menu li.active a {
border-top: 3px solid #333;
color: #333;
font-weight: bold;
}
#foo {
position: absolute;
top: 400px;
}
#bar {
position: absolute;
top: 800px;
}
#baz {
position: absolute;
top: 1200px;
}
</style>
</head>
<body>
<ul id="top-menu">
<li class="active">
<a href="#">Top</a>
</li>
<li>
<a href="#foo">Foo</a>
</li>
<li>
<a href="#bar">Bar</a>
</li>
<li>
<a href="#baz">Baz</a>
</li>
</ul>
<a id="foo">Foo</a>
<a id="bar">Bar</a>
<a id="baz">Baz</a>
</body>
答案 0 :(得分:1)
将您的Javascript移到底部或将其包装在document.ready语句中:
$(function() {
// Handler for .ready() called.
});
您正在尝试将事件附加到尚不存在的元素。
答案 1 :(得分:0)
回应Breezy在评论中提出的新问题:
scrollTop
必须过去锚点才能移动突出显示,1px额外增量并不能完全实现。
改变这个:
offsetTop = href === "#" ? 0 : $(href).offset().top-topMenuHeight+1;
对此:
offsetTop = href === "#" ? 0 : $(href).offset().top-topMenuHeight+2; //<== note the 2
或者这个:
offsetTop = href === "#" ? 0 : $(href).offset().top-topMenuHeight+5; //<== note the 5