js的分页原理以及实现步骤是什么?

JavaScript020

js的分页原理以及实现步骤是什么?,第1张

主要是借鉴了网上一个例子,修改了一些小地方,前端分页的技巧,表格的数据是已经写好了,可以前端渲染表格然后再分页,都是可以的。

其实分页最关键是这两句:

var startRow = (currentPage - 1) * pageSize+1  //currentPage 为当前页,pageSize为每页显示的数据量

var endRow = currentPage * pageSize

找到我们需要显示的行的范围(starRow~endRow)

ps:这里在跳转的时候遇到了一个小BUG,就是获取到的select的value值是string类型的,比如获取到了1,然后你想再加1的时候就会变成"11"  而不是我们想要的"2",所以这里需要用parseInt( )来转换一下,小细节需要注意呀!!!

效果图:

[javascript] view plain copy print?

<!doctype html>

<html>

<head>

<meta charset='utf-8'>

<style type="text/css">

a{

text-decoration: none

}

.table2{

border:#C8C8C8 solid

border-width:1px 0px 0px 1px

background: #F3F0F0

margin-top:25px

}

.td0{

border:#C8C8C8 solid

border-width:0 0 1px 0

}

.td2{

border:#C8C8C8 solid

border-width:0 1px 1px 0 

}

.barcon {

width: 1000px

margin: 0 auto

text-align: center

}

.barcon1 {

font-size: 17px

float: left

margin-top: 20px

}

.barcon2 {

float: right

}

.barcon2 ul {

margin: 20px 0

padding-left: 0

list-style: none

text-align: center

}

.barcon2 li {

display: inline

}

.barcon2 a {

font-size: 16px

font-weight: normal

display: inline-block

padding: 5px

padding-top: 0

color: black

border: 1px solid #ddd

background-color: #fff

}

.barcon2 a:hover{

background-color: #eee

}

.ban {

opacity: .4

}

</style>

</head>

<body>

<table width="950" cellpadding="0" cellspacing="0" class="table2" align="center">

<thead>

<tr>

<td colspan="3" height="33" class="td0"> </td>

<td align="center" class="td2"><a href="###">添加用户</a></td>

</tr>

<tr align="center">

<th width="150" height="33" class="td2">序号</th>

<th width="300" class="td2">用户名</th>

<th width="250" class="td2">权限</th>

<th width="250" class="td2">操作</th>

</tr>

</thead>

<tbody id="adminTbody">

<tr align="center">

<td class="td2" height="33" width="150">1</td>

<td class="td2" >admin</td>

<td class="td2" >管理员</td>

<td class="td2" ><a href="###">修改</a></td>

</tr>

</tbody>

</table>

<div id="barcon" class="barcon" >

<div id="barcon1" class="barcon1"></div>

<div id="barcon2" class="barcon2">

<ul>

<li><a href="###" id="firstPage">首页</a></li>

<li><a href="###" id="prePage">上一页</a></li>

<li><a href="###" id="nextPage">下一页</a></li>

<li><a href="###" id="lastPage">尾页</a></li>

<li><select id="jumpWhere">

</select></li>

<li><a href="###" id="jumpPage" onclick="jumpPage()">跳转</a></li>

</ul>

</div>

</div>

<script src="jquery.js"></script>

<script>

/*动态生成用户函数

num为生成的用户数量

*/

function dynamicAddUser(num){

for(var i=1i<=numi++)

{

var trNode=document.createElement("tr")

$(trNode).attr("align","center")

//序号

var tdNodeNum=document.createElement("td")

$(tdNodeNum).html(i+1)

tdNodeNum.style.width = "150px"

tdNodeNum.style.height = "33px"

tdNodeNum.className = "td2"

//用户名

var tdNodeName=document.createElement("td")

$(tdNodeName).html("lzj"+i)

tdNodeName.style.width = "300px"

tdNodeName.className = "td2"

//权限

var tdNodePri=document.createElement("td")

tdNodePri.style.width = "250px"

tdNodePri.className = "td2"

var priText=document.createElement("span")

$(priText).css({"display":"inline-block","text-align":"center"})

$(priText).text("普通用户")

tdNodePri.appendChild(priText)

//操作

var tdNodeOper = document.createElement("td")

tdNodeOper.style.width = "170px"

tdNodeOper.className = "td2"

var editA = document.createElement("a")

$(editA).attr("href", "###").text("编辑")

$(editA).css({ display: "inline-block" })

tdNodeOper.appendChild(editA)

trNode.appendChild(tdNodeNum)

trNode.appendChild(tdNodeName)

trNode.appendChild(tdNodePri)

trNode.appendChild(tdNodeOper)

$("#adminTbody")[0].appendChild(trNode)

}

}

$(function(){

dynamicAddUser(80)

goPage(1,10)

var tempOption=""

for(var i=1i<=totalPagei++)

{

tempOption+='<option value='+i+'>'+i+'</option>'

}

$("#jumpWhere").html(tempOption)

})

/**

* 分页函数

* pno--页数

* psize--每页显示记录数

* 分页部分是从真实数据行开始,因而存在加减某个常数,以确定真正的记录数

* 纯js分页实质是数据行全部加载,通过是否显示属性完成分页功能

**/

var pageSize=0//每页显示行数

var currentPage_=1//当前页全局变量,用于跳转时判断是否在相同页,在就不跳,否则跳转。

var totalPage//总页数

function goPage(pno,psize){

var itable = document.getElementById("adminTbody")

var num = itable.rows.length//表格所有行数(所有记录数)

pageSize = psize//每页显示行数

//总共分几页

if(num/pageSize > parseInt(num/pageSize)){

totalPage=parseInt(num/pageSize)+1

}else{

totalPage=parseInt(num/pageSize)

}

var currentPage = pno//当前页数

currentPage_=currentPage

var startRow = (currentPage - 1) * pageSize+1

var endRow = currentPage * pageSize

endRow = (endRow > num)? num : endRow

//遍历显示数据实现分页

/*for(var i=1i<(num+1)i++){

var irow = itable.rows[i-1]

if(i>=startRow && i<=endRow){

irow.style.display = ""

}else{

irow.style.display = "none"

}

}*/

$("#adminTbody tr").hide()

for(var i=startRow-1i<endRowi++)

{

$("#adminTbody tr").eq(i).show()

}

var tempStr = "共"+num+"条记录 分"+totalPage+"页 当前第"+currentPage+"页"

document.getElementById("barcon1").innerHTML = tempStr

if(currentPage>1){

$("#firstPage").on("click",function(){

goPage(1,psize)

}).removeClass("ban")

$("#prePage").on("click",function(){

goPage(currentPage-1,psize)

}).removeClass("ban")

}else{

$("#firstPage").off("click").addClass("ban")

$("#prePage").off("click").addClass("ban")

}

if(currentPage<totalPage){

$("#nextPage").on("click",function(){

goPage(currentPage+1,psize)

}).removeClass("ban")

$("#lastPage").on("click",function(){

goPage(totalPage,psize)

}).removeClass("ban")

}else{

$("#nextPage").off("click").addClass("ban")

$("#lastPage").off("click").addClass("ban")

}

$("#jumpWhere").val(currentPage)

}

function jumpPage()

{

var num=parseInt($("#jumpWhere").val())

if(num!=currentPage_)

{

goPage(num,pageSize)

}

}

</script>

</body>

</html>

原则上像这样的功能,应该直接在asp中完成,而不是在前端通过js来实现,这纯属脱裤子放屁。

下面是修改后的代码,不再需要js:

<i id="pronumber"><%for i = 1 to n%><a href="<%=filename%>?page=<%=i%>&<%=url%>"><span<%if i=int(request("page")) then%>style="background:redcolor:#fff"<%end if%>><%=i%></span></a><%next%></i>

另外,html标签的id是具有唯一性的,也就是说每个标签的id是不能相同的。如果出现相同,那么只有第一个才能被js找到。你的这些span都用了相同的id,所以样式始终被匹配到第一个span中。这就是你的代码的错误所在。此种情况应该用class而不是用id,class(类)是允许重复的。

无刷新分页代码,jQuery分页完整示例,分页形式经典,兼容性也做的好,网页上的分页代码

<!DOCTYPE html>

<head>

<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8" />

<title>jQuery分页演示效果</title>

<script type="text/javascript" src="/img/jquery1.3.2.js"></script>

<script type="text/javascript">

$(document).ready(function(){

var show_per_page = 5

var number_of_items = $('#content').children().size()

var number_of_pages = Math.ceil(number_of_items/show_per_page)

$('#current_page').val(0)

$('#show_per_page').val(show_per_page)

var navigation_html = '<a class="previous_link" href="javascript:previous()">Prev</a>'

var current_link = 0

while(number_of_pages >current_link){

navigation_html += '<a class="page_link" href="javascript:go_to_page(' + current_link +')" longdesc="' + current_link +'">'+ (current_link + 1) +'</a>'

current_link++

}

navigation_html += '<a class="next_link" href="javascript:next()">Next</a>'

$('#page_navigation').html(navigation_html)

$('#page_navigation .page_link:first').addClass('active_page')

$('#content').children().css('display', 'none')

$('#content').children().slice(0, show_per_page).css('display', 'block')

})

function previous(){

new_page = parseInt($('#current_page').val()) - 1

if($('.active_page').prev('.page_link').length==true){

go_to_page(new_page)

}

}

function next(){

new_page = parseInt($('#current_page').val()) + 1

//if there is an item after the current active link run the function

if($('.active_page').next('.page_link').length==true){

go_to_page(new_page)

}

}

function go_to_page(page_num){

var show_per_page = parseInt($('#show_per_page').val())

start_from = page_num * show_per_page

end_on = start_from + show_per_page

$('#content').children().css('display', 'none').slice(start_from, end_on).css('display', 'block')

$('.page_link[longdesc=' + page_num +']').addClass('active_page').siblings('.active_page').removeClass('active_page')

$('#current_page').val(page_num)

}

</script>

<style>

#page_navigation a{

padding:3px

border:1px solid gray

margin:2px

color:black

text-decoration:none

}

.active_page{

background:darkblue

color:white !important

}

</style>

</head>

<body>

<input type='hidden' id='current_page' />

<input type='hidden' id='show_per_page' />

<div id='content'>

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<p>Cras non tellus enim, vel mollis diam.</p>

<p>Phasellus luctus quam id ligula commodo eu fringilla est cursus.</p>

<p>Ut luctus augue tortor, in volutpat enim.</p>

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<p>Cras iaculis neque et orci suscipit id porta risus feugiat.</p>

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<p>Suspendisse sagittis mattis sem, sit amet faucibus nisl fermentum vitae.</p>

<p>Nulla sed purus et tellus convallis scelerisque.</p>

<p>Nam at justo ut ante consectetur faucibus.</p>

<p>Proin dapibus nisi a quam interdum lobortis.</p>

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</div>

<div id='page_navigation'></div><br>

<br>

</body>

</html>