;(function($) { $.fn.scrollHighlight = function(options) { return this.each(function() { var defualts = { childItem: "a", //高亮的节点 attribute: "href", //高亮节点属性 highlight: 'highlight', //给高亮节点添加的类 buffer: 0, //距离节点的距离 container: window, //滚动内容的盒子,默认是window cancelFlag: true, //当超过节点时是否取消高亮,默认是取消高亮 mode: 'vertical' //滚动的模式,默认为竖直方向,可以为其他如horizontal(水平方向) }; var opts = $.extend({}, defualts, options), obj = $(this), $container = $(opts.container), mode = opts.mode, buffer = opts.buffer, highlight = opts.highlight, childItem = opts.childItem, attribute = opts.attribute; if (obj.length <= 0) return; var resizeTimer; // Set resizeTimer to empty so it resets on page load var item = obj.find(childItem), i = 0, len = item.length, wrap = [], index = [], anchor = []; for (; i < len; i++) { anchor.push(item.eq(i).attr(attribute)); //获取需要高亮的所有节点 } var aLen = anchor.length; for (var j = 0; j < aLen; j++) { var that = opts.container == window ? $(document).find(anchor[j]) : $container.find(anchor[j]); if (that.length && that.is(":visible")) { //筛选出容器内存在的节点并且是显示的 wrap.push(anchor[j]); //将节点放置在数组wrap中 index.push(j); //筛选出他们的位置 } } var wLen = wrap.length; //滚动时的函数 function onScroll(e) { var pos = []; var scrollPos = { top: $container.scrollTop(), left: $container.scrollLeft() }; var xy = (mode == 'vertical') ? scrollPos.top + buffer : scrollPos.left + buffer; console.log("滚动的高度"+xy); for (var i = 0; i < wLen; i++) { if (mode == 'vertical') { //当默认是垂直滚动时,获取上面节点的位置,并和滚动高度对比,当滚动高度大于它的时候,高亮。 //当滚动高度超过它的位置加上他的高度时,取消节点的高亮 pos.push($(wrap[i]).offset().top); myPos(i); //高亮函数 if (opts.cancelFlag && (pos[i] < xy - $(wrap[i]).outerHeight())) { item.eq(index[i]).removeClass(highlight); } } else { //当滚动方式为水平时,获取节点的左边位置,并和做拉动的值对比,当拉动的值大于它的位置时,高亮 //当拉动的值超过它的左边位置加上它的外边框长度时,取消节点高亮 pos.push($(wrap[i]).offset().left); myPos(i); //高亮函数 if (opts.cancelFlag && (pos[i] < xy - $(wrap[i]).outerWidth())) { item.eq(index[i]).removeClass(highlight); } } } //滚动值大于元素位置添加高亮 function myPos(i) { if (pos[i] <= xy) { item.removeClass(highlight).eq(index[i]).addClass(highlight); } } } //点击跳转到相应的位置 item.each(function(index) { $(this).click(function() { console.log("节点偏移量"+$("#page3").position().top); var that = opts.container == window ? $(document).find(anchor[index]) : $container.find(anchor[index]); if (that.length && that.is(":visible")) { // console.log("yes"); if (mode == 'vertical') { $("html,body").animate({ scrollTop: $(anchor[index]).offset().top - buffer }, 300); } else { // console.log($(anchor[index]).offset().left); $("html,body").animate({ scrollLeft: $(anchor[index]).offset().left - buffer }, 300); } } }) }) // 当有滚动时执行下面代码 $container.on("scroll", function() { clearTimeout(resizeTimer); resizeTimer = setTimeout(onScroll, 100); // alert("yes"); }); // 当发现调整屏幕大小时,重新执行代码 $(window).on("resize", function() { clearTimeout(resizeTimer); resizeTimer = setTimeout(onScroll, 100); }); }); }; })(jQuery);
demo.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JQ 滚动高亮节点插件</title>
<script type="text/javascript" src="jquery-1.10.1.min.js" ></script>
<script type="text/javascript" src="scrollHighlight.js" ></script>
<script type="text/javascript">
$(function(){
$(".sidebar").scrollHighlight({buffer:10});
})
</script>
<style type="text/css">
*{margin:0; padding:0; list-style: none;}
a{text-decoration: none;}
img{max-width: 100%; height: auto;}
.main{overflow: auto;}
.main li{color:#fff; font-size:20px; padding:0px 20px 400px;}
.main li:nth-child(4n+1){background: #5DB2FF;}
.main li:nth-child(4n+2){background: #FB6E52;}
.main li:nth-child(4n+3){background: #E75B8D;}
.main li:nth-child(4n+4){background: #A0D468;}
.main li:last-child{margin-bottom:600px;}
.sidebar{position:fixed; right:0; top:40%; margin:-100px 0 0 0; padding:10px; background: #fff; width:100px;}
.sidebar li{}
.sidebar a{font-size:14px; color:#333; line-height: 30px;}
.sidebar a:hover{color:blue;}
.sidebar .highlight{font-weight: bold; color:blue;}
</style>
</head>
<body>
<div class="main">
<ul>
<li id="page1">
<h3>这是左边滚动到这里右边高亮的节点1</h3>
</li>
<li id="page2">
<h3>这是左边滚动到这里右边高亮的节点2</h3>
</li>
<li id="page3">
<h3>这是左边滚动到这里右边高亮的节点3</h3>
</li>
<li id="page4">
<h3>这是左边滚动到这里右边高亮的节点4</h3>
</li>
<li id="page5">
<h3>这是左边滚动到这里右边高亮的节点5</h3>
</li>
<li id="page6">
<h3>这是左边滚动到这里右边高亮的节点6</h3>
</li>
<li id="page7">
<h3>这是左边滚动到这里右边高亮的节点7</h3>
</li>
<li id="page8">
<h3>这是左边滚动到这里右边高亮的节点8</h3>
</li>
<li id="page9">
<h3>这是左边滚动到这里右边高亮的节点9</h3>
</li>
<li id="page10">
<h3>这是左边滚动到这里右边高亮的节点10</h3>
</li>
</ul>
</div>
<div class="sidebar">
<ul>
<li><a href="#page1">这是节点1</a></li>
<li><a href="#page2">这是节点2</a></li>
<li><a href="#page3">这是节点3</a></li>
<li><a href="#page4">这是节点4</a></li>
<li><a href="#page5">这是节点5</a></li>
<li><a href="#page6">这是节点6</a></li>
<li><a href="#page7">这是节点7</a></li>
<li><a href="#page8">这是节点8</a></li>
<li><a href="#page9">这是节点9</a></li>
</ul>
</div>
</body>
</html>
效果图: