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list.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
* { margin: 0; padding: 0; font-family: "\534E\6587\5B8B\4F53" }
.box { overflow: hidden; width: 500px; height: 500px; background: #eee; border: 1px #aaa solid; border-radius: 5px; margin: 100px auto; position: relative; top: 0; left: 0; -webkit-user-select: none; }
.list { width: 100%; position: absolute; top: 0; }
.float { position: absolute; left: 0; right: 0px; z-index: 1; top: 0; }
.title { height: 30px; line-height: 30px; font-size: 18px; font-weight: bold; background: #333; color: #fff; padding: 0 20px; }
.item { height: 50px; line-height: 50px; font-size: 32px; border-bottom: 1px #ccc solid; padding: 0 20px; }
</style>
<script src="jquery.js"></script>
<script>
$(function () {
var flag = $("#flag");
var $scrolllist, listHeight;
var msOldy, listOldy = 0;
var lih = []
$(".box li").each(function () {
lih.push($(this).position().top);
})
function checkRange(num) {
var res = 0;
for (var i = 0; i < lih.length; i++) {
if (num >= lih[i]) {
res = i;
} else {
return res;
}
}
return res;
}
function resetTop(top) {
if (top > 0) {
top = 0;
} else if (top < 500 - listHeight) {
top = 500 - listHeight;
}
return top;
}
$(".list").bind("mousedown", function (ms) {
$scrolllist = $(this);
listHeight = $scrolllist.height();
msOldy = ms.pageY;
});
$(document).bind("mousemove", function (ms) {
if ($scrolllist) {
//控制list
var msDiff = ms.pageY - msOldy;
msOldy = ms.pageY;
var scrollTop = parseInt($scrolllist.css("top"));
var resTop = scrollTop + msDiff;
resTop = resetTop(resTop);
$scrolllist.css("top", resTop);
var wt = checkRange(-resTop);
var curLi = $scrolllist.children("li").eq(wt).children(".title");
var nextLi = $scrolllist.children("li").eq(wt + 1).children(".title");
flag.html(curLi.html());
var listDiff = resTop - listOldy;
listOldy = resTop;
var flag_top = parseInt(flag.css("top"));
if (listDiff < 0) { //list向上走
var nextTity = nextLi.position().top + resTop;
if (flag_top <= -29) {
flag.css("top", 0);
}
if (0 < nextTity && nextTity < 30) {
flag.css("top", flag_top + listDiff);
} else {
flag.css("top", 0);
}
} else if (listDiff > 0) { //list 向下走
var nextTity = nextLi.position().top + resTop;
if (flag_top >= 0) {
flag.css("top", -30);
flag_top = -30;
}
if (0 < nextTity && nextTity < 30) {
flag.css("top", flag_top + listDiff);
} else {
flag.css("top", 0);
}
}
}
});
$(document).bind("mouseup", function () {
$scrolllist = false;
});
})
</script>
</head>
<body>
<div class="box">
<div id="flag" class="float title">A</div>
<ul class="list">
<li data-title="a">
<p class="title">A</p>
<div class="item">apple</div>
<div class="item">axic</div>
<div class="item">anny</div>
<div class="item">ajax</div>
<div class="item">adidas</div>
</li>
<li data-title="b">
<p class="title">B</p>
<div class="item">bad</div>
<div class="item">black</div>
<div class="item">bob</div>
<div class="item">backham</div>
<div class="item">brown</div>
<div class="item">banana</div>
</li>
<li data-title="c">
<p class="title">C</p>
<div class="item">catch</div>
<div class="item">cate</div>
<div class="item">cake</div>
<div class="item">class</div>
<div class="item">common</div>
<div class="item">cinima</div>
<div class="item">cygnt</div>
</li>
<li data-title="d">
<p class="title">D</p>
<div class="item">dark</div>
<div class="item">digital</div>
<div class="item">dress</div>
<div class="item">dicalong</div>
<div class="item">disdalin</div>
</li>
</ul>
</div>
</body>
</html>