前端分页原理
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>js分页</title>
<style type="text/css">
body { margin: 0; padding: 0; }
.pagination { color: #333; text-align: center; margin: 8px; }
.pagination span { color: #999; margin: 0 1px; padding: 3px 6px; border: 1px solid #ccc; }
.pagination span.on { background-color: #337ab7; color: #fff; font-weight: bold; border: 1px solid #333; }
.pagination a { color: #00f; text-decoration: none; }
.pagination a span { border: 1px solid #66c; color: #33f; }
#pager { margin: 20px; padding: 4px; }
#content { text-align: center; }
</style>
</head>
<body>
<div id="pager"></div>
<div id="content"></div>
<script>
var currentPage = 1; // 当前页码, 从1开始
var pageSize = 5; // 每页显示记录数
var maxButtons = 10; // 显示的分页按钮数量
var totalNumber = 30; // 记录总数
var totalPage = parseInt(Math.ceil(totalNumber / pageSize)); // 总页数
initPage();
function initPage() {
//循环生成数组
var arr = [];
for (var o = 0; o < totalNumber; o++) {
arr.push(o);
}
//每一页第一个li
var rangeStartitem = (currentPage - 1) * pageSize;
//开始页
var rangeStart = Math.max(1, currentPage - parseInt(maxButtons / 2));
//最后一页
var rangeEnd = Math.min(totalPage, rangeStart + maxButtons - 1);
var constr = pageCon(arr, rangeStartitem, pageSize);
var divcontent = document.getElementById("content");
divcontent.innerHTML = constr;
//创建分页模板
var str = "";
str += "<div class='pagination'>";
str += "当前第" + currentPage + "页"
//如果总页数大于1
if (totalPage > 1) {
//当前页不是第一页
if (currentPage != 1) {
str += '<a href="#!" data-num="1"><span>|<</span></a>';
str += '<a href="#!" data-num="' + (currentPage - 1) + '"><span><<</span></a>';
} else {
//如果是第一页，禁用上一页按钮
str += '<span>|<</span>';
str += '<span><<</span>';
}
//中间页码
for (var i = rangeStart; i <= rangeEnd; i++) {
//如果是当前页的话，就禁用当前页的按钮
if (i == currentPage) {
str += '<span class="on">' + i + "</span>";
} else {
//否则就可以点击该页
str += '<a href="#" data-num="' + i + '"><span>' + i + "</span></a>";
}
}
//当前页不是总页，即是最后一页
if (currentPage != totalPage) {
str += '<a href="#" data-num="' + (currentPage + 1) + '"><span>>></span></a>';
str += '<a href="#" data-num="' + totalPage + '"><span>>|</span></a>';
} else {
//如果是最后页，禁用下一页
str += '<span>>></span>';
str += '<span>>|</span>';
}
}
str += ' 一共' + totalPage + '页, ' + totalNumber + '条记录 </div>';
var divpager = document.getElementById("pager");
divpager.innerHTML = str;
//获取所有生成的页面链接
var listTag = divpager.getElementsByTagName('a');
//绑定li事件
for (var i = 0; i < listTag.length; i++) {
listTag[i].onclick = function() {
var currentPage = this.getAttribute('data-num');
nowcurrentPage(currentPage);
return false;
};
}
}
//传递页面
function nowcurrentPage(currentPage) {
this.currentPage = currentPage;
initPage();
}
//生成每页的数据
function pageCon(arr, rangeStartitem, len) {
var constr = '';
for (var i = rangeStartitem; i < rangeStartitem + len; i++) {
constr += "<li>"+ arr[i] + "</li>";
}
return constr;
}
</script>
</body>
</html>
