jquery+Ajax实现简单分页条效果

本文实例为大家分享了jquery+Ajax实现分页条效果的具体代码，供大家参考，具体内容如下

一、如果是jsp页面的话，可以用EL表达式和JSTL标签制作一个分页条，没有什么难度。用EL表达式和JSTL标签实现的缺点就是无法实现异步效果，整个页面是重新刷新了一遍的。

二、如果是普通的html页面，当然是无法使用EL表达式和JSTL标签的，这时只能通过异步Ajax的方式去实现。当然了，JSP页面两种方式都是可以使用的。

三、分页条，这里我是用Ajax和Jquery去做的。实现起来比较繁琐，代码特别长，因为都是拼接一大堆的字符串，然后使用html()方法或是append()方法去改变文档的内容。

四、事前分析

浏览器端需要发送给服务器端的参数有两个：

①当前的页码currentPage；
②页面的大小（一页显示几条记录）pageSize。

服务器端给浏览器端发送的是Json格式的数据，也就是一个页面实体类PageBean。其中PageBean有如下字段：

①总记录数totalCount；
②总页码totalPage；
③每页的数据 List list；
④当前页码currentPage；
⑤每页显示的记录数pageSize。

这个PageBean支持泛型，代码如下：

public class PageBean<T> 
{
    private int totalCount; // 总记录数
    private int totalPage ; // 总页码
    private List<T> list ; // 每页的数据
    private int currentPage ; //当前页码
    private int rows;//每页显示的记录数，也就是pageSize

    public int getTotalCount() 
    {
        return totalCount;
    }

    public void setTotalCount(int totalCount)
    {
        this.totalCount = totalCount;
    }

    public int getTotalPage() 
    {
        return totalPage;
    }

    public void setTotalPage(int totalPage) 
    {
        this.totalPage = totalPage;
    }

    public List<T> getList() 
    {
        return list;
    }

    public void setList(List<T> list) 
    {
        this.list = list;
    }

    public int getCurrentPage() 
    {
        return currentPage;
    }

    public void setCurrentPage(int currentPage) 
    {
        this.currentPage = currentPage;
    }

    public int getRows() 
    {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    @Override
    public String toString() 
    {
        return "PageBean{" +
                "totalCount=" + totalCount +
                ", totalPage=" + totalPage +
                ", list=" + list +
                ", currentPage=" + currentPage +
                ", rows=" + rows +
                '}';
    }
}

要想做到分页，肯定要用到SQL语句中的“limit”。举个例子说明一下含义。

select * from student limit 2,5;

具体含义：从student表当中查询数据，从索引为“2”的记录开始查询，往后查5条。

索引是从0开始的，所以上面的语句相当于查询了第3、第4、第5、第6、第7条记录，总共5条记录。

总而言之，第一个数字就是“从哪开始查”的意思，第二个数字就是“往后查几条”的意思。

这里的“从哪开始查”，需要计算出来。公式如下：

(currentPage-1)×pageSize

也就是当前页码减去一，括号，在乘以页面大小。

所以查询语句的伪代码如下：

select * from student limit (currentPage-1)×pageSize,pageSize;

对于总页码totalPage，可以通过总记录数totalCount和页面大小pageSize计算出来。代码如下：

totalPage=totalCount%pageSize==0?totalCount/pageSize:(totalCount/pageSize+1);

五、服务器端主要代码

import com.fasterxml.jackson.databind.ObjectMapper;
import domain.PageBean;
import domain.RainFall;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import util.JDBCUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/ViewRainByPageServlet")
public class ViewRainByPageServlet extends HttpServlet
{
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        JdbcTemplate template=new JdbcTemplate(JDBCUtils.getDataSource());
        String sql="select * from rain_fall limit ?,?";//查询部分元组
        String sql2="select * from rain_fall";//查询所有元组
        List<RainFall> countList = template.query(sql2, new BeanPropertyRowMapper<RainFall>(RainFall.class));
        int totalCount=countList.size();//从数据库获取总记录数
        int totalPage;//先声明一下总的页码，总的页码需要根据客户端发送过来的数据进行计算

        String currentPage = request.getParameter("currentPage");
        String pageSize = request.getParameter("pageSize");
        int intCurrentPage = Integer.parseInt(currentPage);//用户发来的当前页码
        if(intCurrentPage==0)//用户点击上一页按钮，currentPage就减1，会出现减到0的情况
        {
            intCurrentPage=1;//如果用户的currentPage=0，直接把页码设为1，把第一页的数据返回给客户端
        }

        int intPageSize = Integer.parseInt(pageSize);//用户发来的页面大小
        totalPage=totalCount%intPageSize==0?totalCount/intPageSize:(totalCount/intPageSize+1);//计算出总的页数
        if(intCurrentPage>totalPage)//用户点击下一页按钮，currentPage就加1，会出现大于总页数的情况
        {
            intCurrentPage=totalPage;//把当前页码设为总页数
        }

        int startIndex=(intCurrentPage-1)*intPageSize;//从索引为几的记录开始查询？

        List<RainFall> list = template.query(sql, new BeanPropertyRowMapper<RainFall>(RainFall.class),startIndex,intPageSize);
        ObjectMapper mapper=new ObjectMapper();
        response.setContentType("application/json;charset=utf-8");//设置响应数据类型和字符编码
        PageBean<RainFall> pageBean=new PageBean<>();//创建PageBean对象
        //封装PageBean对象
        pageBean.setTotalCount(totalCount);
        pageBean.setTotalPage(totalPage);
        pageBean.setList(list);
        pageBean.setCurrentPage(intCurrentPage);
        pageBean.setRows(intPageSize);
        //将数据写回客户端
        System.out.println(pageBean);
        mapper.writeValue(response.getOutputStream(),pageBean);

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {

        this.doPost(request, response);

    }
}

六、前端代码（很长）

<%--
  Created by Yingyong Lao.
  User: laoyingyong
  Date: 2019-12-10
  Time: 19:28
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>查看降雨信息</title>
    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="external nofollow"  rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <script>
        $(function () //入口函数
        {
            $.post("ViewRainByPageServlet",{currentPage:1,pageSize:5},function (data)//页面加载完成之后发送ajax请求，请求前5条记录,完成界面的初始化
            {
               var totalCount=data.totalCount;//总记录数
               var totalPage=data.totalPage;//总页数
               var currentPage=data.currentPage;//当前页码

                if(currentPage==1)//如果当前页码为1，用户还点击上一页的话，设置class="disabled" ，即出现一个“禁用”图标
                {
                    var str=' <li class="disabled" οnclick="findByPage('+(currentPage-1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Previous">\n' +
                        '                        <span aria-hidden="true">&laquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>';

                }
                else//否则上一页的按钮就是正常的样式
                {
                    var str=' <li οnclick="findByPage('+(currentPage-1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Previous">\n' +
                        '                        <span aria-hidden="true">&laquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>';

                }

                for(var i=1;i<=totalPage;i++)//遍历页码，这是两个图标（上一页和下一页）之间的数字
                {
                    if(i==currentPage)//如果当前的这个数字等于当前页码currentPage，就设置class="active"，即页码呈高亮样式
                    {
                        var item='<li οnclick="findByPage('+i+',5);" class="active"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >'+i+'</a></li>';
                    }
                    else
                    {
                        var item='<li οnclick="findByPage('+i+',5);"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >'+i+'</a></li>';
                    }
                    str=str+item;

                }
                if(currentPage==totalPage)//如果当前页码为最后一页，用户还点击下一页的话，设置class="disabled" ，即出现一个“禁用”图标
                {
                    var strend='<li class="disabled" οnclick="findByPage('+(currentPage+1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Next">\n' +
                        '                        <span aria-hidden="true">&raquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>\n' +
                        '                <span style="font-size: 24px" id="total_sp">共'+totalCount+'条记录，共'+totalPage+'页</span>';

                }
                else //不是最后一页，就是正常的样式
                {
                    var strend='<li οnclick="findByPage('+(currentPage+1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Next">\n' +
                        '                        <span aria-hidden="true">&raquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>\n' +
                        '                <span style="font-size: 24px" id="total_sp">共'+totalCount+'条记录，共'+totalPage+'页</span>';

                }

                str=str+strend;
                $("#fenyelan").html(str);//分页条初始化

                var array=data.list;
                for(var i=0;i<array.length;i++)
                {
                    var obj=array[i];
                    var id=obj.id;
                    var area=obj.area;
                    var precipitation=obj.precipitation;
                    var month=obj.month;
                    var releaseDate=obj.releaseDate;
                    //表格的初始化
                    $("#rain_table").append('<tr class="info">\n' +
                        '                <td style="text-align: center">'+id+'</td>\n' +
                        '                <td style="text-align: center">'+area+'</td>\n' +
                        '                <td style="text-align: center">'+precipitation+'</td>\n' +
                        '                <td style="text-align: center">'+month+'</td>\n' +
                        '                <td style="text-align: center">'+releaseDate+'</td>\n' +
                        '            </tr>');
                }

            });//页面加载完成之后发送ajax请求end

        });//入口函数end



        //页面按钮的点击回调函数，不需要写在入口函数里面，因为只有页面按钮被点击时，这个函数才会被调用
        function findByPage(curPage,paSize) //被调用的时候，需要传递两个参数：当前页码和页码的大小（一页有几条记录）
        {
            $.post("ViewRainByPageServlet",{currentPage:curPage,pageSize:paSize},function (data) //发送ajax请求
            {
                var totalCount=data.totalCount;//总记录数
                var totalPage=data.totalPage;//总页数
                var currentPage=data.currentPage;//当前页码


                if(currentPage==1)//如果当前页码为1，用户还点击上一页的话，设置class="disabled" ，即出现一个“禁用”图标
                {
                    var str=' <li class="disabled" οnclick="findByPage('+(currentPage-1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Previous">\n' +
                        '                        <span aria-hidden="true">&laquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>';

                }
                else//不为第一页，上一页按钮就是正常的样式
                {
                    var str=' <li οnclick="findByPage('+(currentPage-1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Previous">\n' +
                        '                        <span aria-hidden="true">&laquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>';

                }


                //分页条中间数字部分
                for(var i=1;i<=totalPage;i++)
                {
                    if(i==currentPage)//如果当前的这个数字等于当前页码currentPage，就设置class="active"，即页码呈高亮样式
                    {

                        var item='<li οnclick="findByPage('+i+',5);" class="active"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >'+i+'</a></li>';
                    }
                    else
                    {
                        var item='<li οnclick="findByPage('+i+',5);"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >'+i+'</a></li>';
                    }


                    str=str+item;

                }
                if(currentPage==totalPage)//如果当前页码为最后一页，用户还点击下一页的话，设置class="disabled" ，即出现一个“禁用”图标
                {
                    var strend='<li class="disabled" οnclick="findByPage('+(currentPage+1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Next">\n' +
                        '                        <span aria-hidden="true">&raquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>\n' +
                        '                <span style="font-size: 24px" id="total_sp">共'+totalCount+'条记录，共'+totalPage+'页</span>';

                }
                else //不是最后一页，就是正常的样式
                {
                    var strend='<li οnclick="findByPage('+(currentPage+1)+',5)">\n' +
                        '                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Next">\n' +
                        '                        <span aria-hidden="true">&raquo;</span>\n' +
                        '                    </a>\n' +
                        '                </li>\n' +
                        '                <span style="font-size: 24px" id="total_sp">共'+totalCount+'条记录，共'+totalPage+'页</span>';

                }
                str=str+strend;
                $("#fenyelan").html(str);//改变分页条的内容

                //表格的字符串
                var tableStr='<caption style="text-align: center;font-size: 24px">降雨信息一览</caption>\n' +
                    '            <tr class="success">\n' +
                    '                <th style="text-align: center">id</th>\n' +
                    '                <th style="text-align: center">地区</th>\n' +
                    '                <th style="text-align: center">降雨量（mm）</th>\n' +
                    '                <th style="text-align: center">月份</th>\n' +
                    '                <th style="text-align: center">发布日期</th>\n' +
                    '            </tr>';
                var array=data.list;//具体内容的对象数组
                for(var i=0;i<array.length;i++)//遍历数对象组
                {
                    var obj=array[i];//数组的一个元素就是一个对象
                    var id=obj.id;
                    var area=obj.area;
                    var precipitation=obj.precipitation;
                    var month=obj.month;
                    var releaseDate=obj.releaseDate;
                    //一行记录的字符串
                    var oneRecord='<tr class="info">\n' +
                        '                <td style="text-align: center">'+id+'</td>\n' +
                        '                <td style="text-align: center">'+area+'</td>\n' +
                        '                <td style="text-align: center">'+precipitation+'</td>\n' +
                        '                <td style="text-align: center">'+month+'</td>\n' +
                        '                <td style="text-align: center">'+releaseDate+'</td>\n' +
                        '            </tr>';

                    tableStr=tableStr+oneRecord;//表格字符串的追加，每遍历一条记录，就会追加一行
                }
                $("#rain_table").html(tableStr);//改变表格里面的内容

            });//ajax请求end

        }//页面按钮的点击函数end

    </script>
</head>
<body>
<div class="container">
    <div class="row">

        <table class="table table-bordered table-hover" id="rain_table">
            <caption style="text-align: center;font-size: 24px">降雨信息一览</caption>
            <tr class="success">
                <th style="text-align: center">id</th>
                <th style="text-align: center">地区</th>
                <th style="text-align: center">降雨量（mm）</th>
                <th style="text-align: center">月份</th>
                <th style="text-align: center">发布日期</th>
            </tr>
        </table>


        <nav aria-label="Page navigation">
            <ul class="pagination" id="fenyelan">
                <li>
                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Previous">
                        <span aria-hidden="true">&laquo;</span>
                    </a>
                </li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >1</a></li>
                <li>
                    <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  aria-label="Next">
                        <span aria-hidden="true">&raquo;</span>
                    </a>
                </li>
                <span style="font-size: 24px" id="total_sp">共2条记录，共1页</span>
            </ul>
        </nav>



    </div>

</div>

</body>
</html>

七、效果展示

这只是一个简单的分页条，没有百度分页条“前五后四”的效果。当数据量变得非常庞大时，这个分页条就会占据很大的空间。有时间的话再优化一下吧。至于Jquery代码，代码的注释里已经写得够清楚了，这里就不再做过多的解释。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持NICE源码。