jquery.nav.js定位导航滚动插件

/*
* jQuery One Page Nav Plugin
* http://github.com/davist11/jQuery-One-Page-Nav
*
* Copyright (c) 2010 Trevor Davis (http://trevordavis.net)
* Dual licensed under the MIT and GPL licenses.
* Uses the same license as jQuery, see:
* http://jquery.org/license
*
* @version 3.0.0
*
* Example usage:
* $('#nav').onePageNav({
* currentClass: 'current',
* changeHash: false,
* scrollSpeed: 750
* });
*/
;(function($, window, document, undefined){ // our plugin constructor
var OnePageNav = function(elem, options){
this.elem = elem;
this.$elem = $(elem);
this.options = options;
this.metadata = this.$elem.data('plugin-options');
this.$win = $(window);
this.sections = {};
this.didScroll = false;
this.$doc = $(document);
this.docHeight = this.$doc.height();
}; // the plugin prototype
OnePageNav.prototype = {
defaults: {
navItems: 'a',
currentClass: 'current',
changeHash: false,
easing: 'swing',
filter: '',
scrollSpeed: 750,
scrollThreshold: 0.5,
begin: false,
end: false,
scrollChange: false
}, init: function() {
// Introduce defaults that can be extended either
// globally or using an object literal.
this.config = $.extend({}, this.defaults, this.options, this.metadata); this.$nav = this.$elem.find(this.config.navItems); //Filter any links out of the nav
if(this.config.filter !== '') {
this.$nav = this.$nav.filter(this.config.filter);
} //Handle clicks on the nav
this.$nav.on('click.onePageNav', $.proxy(this.handleClick, this)); //Get the section positions
this.getPositions(); //Handle scroll changes
this.bindInterval(); //Update the positions on resize too
this.$win.on('resize.onePageNav', $.proxy(this.getPositions, this)); return this;
}, adjustNav: function(self, $parent) {
self.$elem.find('.' + self.config.currentClass).removeClass(self.config.currentClass);
$parent.addClass(self.config.currentClass);
}, bindInterval: function() {
var self = this;
var docHeight; self.$win.on('scroll.onePageNav', function() {
self.didScroll = true;
}); self.t = setInterval(function() {
docHeight = self.$doc.height(); //If it was scrolled
if(self.didScroll) {
self.didScroll = false;
self.scrollChange();
} //If the document height changes
if(docHeight !== self.docHeight) {
self.docHeight = docHeight;
self.getPositions();
}
}, 250);
}, getHash: function($link) {
return $link.attr('href').split('#')[1];
}, getPositions: function() {
var self = this;
var linkHref;
var topPos;
var $target; self.$nav.each(function() {
linkHref = self.getHash($(this));
$target = $('#' + linkHref); if($target.length) {
topPos = $target.offset().top;
self.sections[linkHref] = Math.round(topPos);
}
});
}, getSection: function(windowPos) {
var returnValue = null;
var windowHeight = Math.round(this.$win.height() * this.config.scrollThreshold); for(var section in this.sections) {
if((this.sections[section] - windowHeight) < windowPos) {
returnValue = section;
}
} return returnValue;
}, handleClick: function(e) {
var self = this;
var $link = $(e.currentTarget);
var $parent = $link.parent();
var newLoc = '#' + self.getHash($link); if(!$parent.hasClass(self.config.currentClass)) {
//Start callback
if(self.config.begin) {
self.config.begin();
} //Change the highlighted nav item
self.adjustNav(self, $parent); //Removing the auto-adjust on scroll
self.unbindInterval(); //Scroll to the correct position
self.scrollTo(newLoc, function() {
//Do we need to change the hash?
if(self.config.changeHash) {
window.location.hash = newLoc;
} //Add the auto-adjust on scroll back in
self.bindInterval(); //End callback
if(self.config.end) {
self.config.end();
}
});
} e.preventDefault();
}, scrollChange: function() {
var windowTop = this.$win.scrollTop();
var position = this.getSection(windowTop);
var $parent; //If the position is set
if(position !== null) {
$parent = this.$elem.find('a[href$="#' + position + '"]').parent(); //If it's not already the current section
if(!$parent.hasClass(this.config.currentClass)) {
//Change the highlighted nav item
this.adjustNav(this, $parent); //If there is a scrollChange callback
if(this.config.scrollChange) {
this.config.scrollChange($parent);
}
}
}
}, scrollTo: function(target, callback) {
var offset = $(target).offset().top; $('html, body').animate({
scrollTop: offset
}, this.config.scrollSpeed, this.config.easing, callback);
}, unbindInterval: function() {
clearInterval(this.t);
this.$win.unbind('scroll.onePageNav');
}
}; OnePageNav.defaults = OnePageNav.prototype.defaults; $.fn.onePageNav = function(options) {
return this.each(function() {
new OnePageNav(this, options).init();
});
};})( jQuery, window , document );
/* 代码整理：懒人之家 www.lanrenzhijia.com */

<!DOCTYPE html>
<html lang="en"><head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
* {
margin: 0;
padding: 0
} li {
list-style: none
}
a{text-decoration: none;} #nav {
position: fixed;
*left: 90px;
top:100px;
} #nav li {
margin-bottom: 2px;
width: 130px;
height: 41px;
line-height: 41px;
} #nav a {
background: #B18282;
color: #fff;
display: block;
text-transform: uppercase;
-ms-text-overflow: ellipsis;
padding: 0 5px;
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
} #nav a:hover {
background: #00d420;
color: #fff;
} #nav .current a {
background: #00d420;
color: #fff;
}
.head{margin: 0 auto; width: 100%; height: 100px; line-height: 100px; background: #D49B6D; text-align: center; font-size: 30px;}
.main{ width: 800px; margin: 0 auto; }
.box{ width: 600px; border:1px solid #ddd; margin-left: 140px; }
</style>
</head><body>
<div class="head">导航</div>
<div class="main">
<ul id="nav">
<li><a href="#a0">花卉详情</a></li>
<li><a href="#a1">介绍</a></li>
<li><a href="#a2">形态特征</a></li>
<li><a href="#a3">生长习性</a></li>
<li><a href="#a4">栽培技术</a></li>
<li><a href="#a5">主要价值</a></li>
</ul>
<div class="box">
<div id="a0" style="height: 300px;border:1px solid #ddd;">花卉详情</div>
<div id="a1" style="height: 300px;border:1px solid #ddd;">介绍</div>
<div id="a2" style="height: 300px;border:1px solid #ddd;">形态特征</div>
<div id="a3" style="height: 300px;border:1px solid #ddd;">生长习性</div>
<div id="a4" style="height: 300px;border:1px solid #ddd;">栽培技术</div>
<div id="a5" style="height: 300px;border:1px solid #ddd;">主要价值</div>
</div>
</div>
<script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="js/jquery.nav.js"></script>
<script>
$(function() {
$('#nav').onePageNav();
});
</script>
</body></html>