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纯jQuery实现前端分页功能

2019年06月10日 | 移动技术网IT编程 | 我要评论

由于之前自己做过jquery分页，就是调用jni接口时，只能用前台分页解决显示问题。最近看到有人提这样的问题：一个请求传过来上万个数据怎么办？于是萌生了写这篇博客的想法。

效果展示：

因为核心代码主要在前端jquery，为了简便，后台就用servlet遍历本地磁盘目录文件的形式模拟响应的数据。

本项目的目录结构：

本项目的本地遍历文件夹结构：

处理显示请求的servlet:

package com.cn.action;
import com.alibaba.fastjson.json;
import com.cn.entity.downloadfile;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import java.io.*;
import java.util.arraylist;
import java.util.list;
import java.util.properties;
/**
 * created by nolimitors on 2017/3/17.
 */
public class pagesservlet extends httpservlet{
 protected void doget(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception {
  /**
   *@author: nolimitor
   *@params: * @param req
   * @param resp
   *@date: 17:55 2017/3/17
   */
  dopost(req,resp);

 }
 protected void dopost(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception {
  /**
  *@author: nolimitor
  *@params: * @param req
   * @param resp
  *@date: 17:55 2017/3/17
  */
  properties props = new properties();
  inputstream in = new bufferedinputstream(new fileinputstream(this.getclass().getresource("/fileroot.properties").getpath()));
  props.load(in);
  string rootpath = props.getproperty("root");
  list filelist = new arraylist();

   file file = new file(rootpath);
   file []files = file.listfiles();
   downloadfile df = new downloadfile();
   for(file f:files) {
    df.setname(f.getname());
    df.setfilesize(long.tostring(f.length()));
    system.out.println(f.getname());
    filelist.add(json.tojsonstring(df));
   }
  resp.addheader("content-type","application/json");
  resp.setheader("content-type", "text/html;charset=utf-8");
  resp.getwriter().print(json.tojsonstring(filelist));
 }
}

pagesservlet

处理下载文件请求的servlet：

package com.cn.action;
import javax.servlet.servletexception;
import javax.servlet.servletoutputstream;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import java.io.*;
import java.net.urlencoder;
import java.util.properties;
/**
 * created by nolimitors on 2017/3/20.
 */
public class downloadfile extends httpservlet {
 @override
 protected void dopost(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception {
  doget(req,resp);
 }
 @override
 protected void doget(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception {
  //获取所要下载文件的路径
  properties props = new properties();
  inputstream in = new bufferedinputstream(new fileinputstream(this.getclass().getresource("/fileroot.properties").getpath()));
  props.load(in);
  string rootpath = props.getproperty("root");
  string name = req.getparameter("filename");
  name = new string(name.getbytes("iso8859-1"),"utf-8");
  system.out.println(name);
  //处理请求
  //读取要下载的文件
  file f = new file(rootpath+"\\"+ name);
  if(f.exists()){
   fileinputstream fis = new fileinputstream(f);
   string filename=java.net.urlencoder.encode(f.getname(),"utf-8"); //解决中文文件名下载乱码的问题
   byte[] b = new byte[fis.available()];
   fis.read(b);
   //解决中文文件名下载后乱码的问题
   resp.setcontenttype("application/x-msdownload");
   resp.setheader("content-disposition", "attachment;filename="+
     new string(filename.getbytes("utf-8"),"iso-8859-1"));
   //获取响应报文输出流对象
   servletoutputstream out =resp.getoutputstream();
   //输出
   out.write(b);
   out.flush();
   out.close();
  }
 }
}

downloadfile

web.xml配置：

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
   version="3.1">
 <servlet>
  <servlet-name>pageservlet</servlet-name>
  <servlet-class>com.cn.action.pagesservlet</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>pageservlet</servlet-name>
  <url-pattern>/dopages</url-pattern>
 </servlet-mapping>
 <servlet>
  <servlet-name>downservlet</servlet-name>
  <servlet-class>com.cn.action.downloadfile</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>downservlet</servlet-name>
  <url-pattern>/download</url-pattern>
 </servlet-mapping>
</web-app>

web.xml

前台完整html代码：

<html>
 <head>
 <meta http-equiv="content-type" content="text/html; charset=utf-8">
 <link href="/resource/juqery/css/base/jquery-ui-1.9.2.custom.css" rel="external nofollow" rel="stylesheet">
 <link href="/resource/css/css.css" rel="external nofollow" rel="stylesheet">
 <script type="application/javascript" src="/resource/common.js"></script>
 <script type="application/javascript" src="/resource/juqery/js/jquery-1.8.3.js"></script>
 <script type="application/javascript" src="/resource/juqery/js/jquery-ui-1.9.2.custom.js"></script>
 </head>
 <script type="application/javascript">
 //请求一次数据，然后存储到js变量中，保证只发送一条请求
 var datas;
 jquery(function() {
  $.ajax({
   type: "post",
   url: "/dopages",
   data: "{}",
   datatype: 'json',
   success: function(data) {
   datas = data;
   getpages(1,5);
   }
  });
 });
 //用于页码跳转方法
 function jumpage(totalpage,psize){
  var cpage=jquery("#page_no").val();
  if(0< cpage && cpage <= totalpage){
  getpages(cpage,psize);
  }
  else{
  alert("out of range");
  }
 }
 function getpages(pno,psize) {
  var num;//分页总行数
  var totalpage = 0;//分页总页数
  var pagesize = psize;//分页每行显示数
  var currentpage = pno;//当前页
  num = parseint(datas.length);//获取数据行数
  if (num / pagesize > parseint(num / pagesize)) {
  totalpage = parseint(num / pagesize) + 1;
  } else {
  totalpage = parseint(num / pagesize);
  }
  var startrow = (currentpage - 1) * pagesize + 1;//开始显示的行
  var endrow = currentpage * pagesize;//结束显示的行
  endrow = (endrow > num) ? num : endrow;
  var tbody = jquery("#list_data>tbody");
  tbody.empty();
  jquery.each(datas, function (i, n) {
  var file = json.parse(n);
  if (startrow <= parseint(i + 1) && parseint(i + 1) <= endrow) {
   var row = createrow().appendto(tbody);
   //多选用，目前暂时未考虑
   /* createcolumn().html("<input type='checkbox' id="+"fileid"+(i+1)+" name='fileid'/>").appendto(row);*/
   createcolumn().text(i + 1).appendto(row);
   createcolumn().text(file.name).appendto(row);
   createcolumn().text(getsize(file.filesize)).appendto(row);
   var operationcolumn = createcolumn().appendto(row);
  }
  //每次执行分页代码时需要将前一次分页的判断结果清空
  jquery("#last_page").removeattr("onclick");
  jquery("#next_page").removeattr("onclick");
  //当前页非第一页时
  if (currentpage > 1) {
   jquery("#last_page").attr("onclick", "getpages(" + (parseint(currentpage) - 1) + "," + psize + ")");
  }
  //当前页小于总页数时
  if (currentpage < totalpage) {
   jquery("#next_page").attr("onclick", "getpages(" + (parseint(currentpage) + 1) + "," + psize + ")");
  }
  //显示当前页码、总页数及生成跳转点击事件
  jquery("#end_page").attr("onclick", "getpages(" + (totalpage) + "," + psize + ")");
  jquery("#first_page").attr("onclick", "getpages(" + (1) + "," + psize + ")");
  jquery("#jump_page").attr("onclick", "jumpage(" + (totalpage) + "," + psize + ")");
  jquery("#total_page").val("/" + totalpage + " 页");
  jquery("#page_no").val(currentpage);
  var btndownload = jquery("<button class='btn_download'>下载</button>");
  var btndelete = jquery("<button class='btn_delete'>删除</button>");
  //批量删除获取文件信息用，目前暂时不用
  /*jquery("#"+"fileid"+(i+1)).attr("recordquery",json.stringify(recordquery));*/
  btndownload.click(function () {
   location.href = "/download?filename=" + file.name;
  });
  btndelete.click(function () {
   recordquery = jquery(this).attr("data-record-query");
   var dialogdiv = jquery("<div></div>");
   dialogdiv.dialog({
   autoopen: false,
   modal: true,
   width: 500,
   position: {my: "center", at: "center", of: jquery(".content_wrapper_hidden")},
   title: "文件删除",
   buttons: [
    {
    text: "确认",
    click: function () {
   jquery.post("/delete", file.name, function (data) {
    location.reload();
   });
   jquery(this).dialog("close");
   }
  },
   {
   text: "取消",
     click: function () {
   jquery(this).dialog("close");
   }
   }
   ]
  });
   var text = "确认删除 "+ file.name + "?";
   dialogdiv.text(text).dialog("open");
  });
  btndownload.appendto(operationcolumn);
  btndelete.appendto(operationcolumn);
  });
  jquery(".btn_download,.btn_delete").button();
 }
 function getsize(length) {
  var len, unit;
  if (length == 0) {
  len = 0;
  unit = "b";
  } else if (length < 1024) {
  len = length;
  unit = "b";
  } else if (length < (1024 * 1024)) {
  len = (length / 1024);
  unit = "kb";
  } else {
  len = (length / 1024 / 1024);
  unit = "mb";
  }
  return new number(len).tofixed(2) + unit;
 }
 </script>
 <style>
 .data tbody tr td:first-child{
  font-weight:bold;
  cursor: pointer;
 }
 </style>
 <body>
 <div class="main_wrapper">
  <div class="content_wrapper_hidden">
  <div class="ui_wrapper">
  <table id="list_data" class="data" border="0" cellspacing="0" cellpadding="0" style="width: 100%">
  <thead>
  <tr>
   <th >num</th>
   <th >files</th>
   <th >size</th>
   <th >operation</th>
  </tr>
  </thead>
  <tbody>
  </tbody>
  </table>
   <!-- 分页用按钮-->
   <table class="ui-corner-all grey" style="width: 100%">
   <tbody align="center" valign="middle">
   <tr><td><div id="pagination">
<!-- 全选和批量删除按钮，目前暂时未考虑-->
<!--<input type="button" id='fileids' style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border-color:#c5c5c5" value="全选"/><input type="button" id='delete_fileids' style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border-color:#c5c5c5" value="删除"/>-->
    <input type="button" id='first_page' style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border-color:#c5c5c5" value="首页"/><input type="button" style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border-color:#c5c5c5" id='last_page' value="上一页"/><input type="button" id='next_page' style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border-color:#c5c5c5" value="下一页"/><input type="button" style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border-color:#c5c5c5" id='end_page' value="尾页"/><input type="button" style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border-color:#c5c5c5" id='jump_page' value="跳转"/>
    <input autocomplete="off" class="ui-autocomplete-input" id="page_no" style="height: 20px;width:30px"/><input type="button" style="background: -moz-linear-gradient(top,#ffffff,#e6e6e6);border: none" id='total_page' value="0 页" /></div></td></tr>
   </tbody>
   </table>
  <!-- 分页用按钮-->
   </div>
  </div>
  </div>
 </body>
</html>

分页的核心jquery代码：

function getpages(pno,psize) {
  var num;//分页总行数
  var totalpage = 0;//分页总页数
  var pagesize = psize;//分页每行显示数
  var currentpage = pno;//当前页
  num = parseint(datas.length);//获取数据行数
  if (num / pagesize > parseint(num / pagesize)) {
  totalpage = parseint(num / pagesize) + 1;
  } else {
  totalpage = parseint(num / pagesize);
  }
  var startrow = (currentpage - 1) * pagesize + 1;//开始显示的行
  var endrow = currentpage * pagesize;//结束显示的行
  endrow = (endrow > num) ? num : endrow;
  var tbody = jquery("#list_data>tbody");
  tbody.empty();
  jquery.each(datas, function (i, n) {
  var file = json.parse(n);
  if (startrow <= parseint(i + 1) && parseint(i + 1) <= endrow) {
   var row = createrow().appendto(tbody);
   //多选用，目前暂时未考虑
   /* createcolumn().html("<input type='checkbox' id="+"fileid"+(i+1)+" name='fileid'/>").appendto(row);*/
   createcolumn().text(i + 1).appendto(row);
   createcolumn().text(file.name).appendto(row);
   createcolumn().text(getsize(file.filesize)).appendto(row);
   var operationcolumn = createcolumn().appendto(row);
  }
  //每次执行分页代码时需要将前一次分页的判断结果清空
  jquery("#last_page").removeattr("onclick");
  jquery("#next_page").removeattr("onclick");
  //当前页非第一页时
  if (currentpage > 1) {
   jquery("#last_page").attr("onclick", "getpages(" + (parseint(currentpage) - 1) + "," + psize + ")");
  }
  //当前页小于总页数时
  if (currentpage < totalpage) {
   jquery("#next_page").attr("onclick", "getpages(" + (parseint(currentpage) + 1) + "," + psize + ")");
  }
  //显示当前页码、总页数及生成跳转点击事件
  jquery("#end_page").attr("onclick", "getpages(" + (totalpage) + "," + psize + ")");
  jquery("#first_page").attr("onclick", "getpages(" + (1) + "," + psize + ")");
  jquery("#jump_page").attr("onclick", "jumpage(" + (totalpage) + "," + psize + ")");
  jquery("#total_page").val("/" + totalpage + " 页");
  jquery("#page_no").val(currentpage);
  var btndownload = jquery("<button class='btn_download'>下载</button>");
  var btndelete = jquery("<button class='btn_delete'>删除</button>");
  //批量删除获取文件信息用，目前暂时不用
  /*jquery("#"+"fileid"+(i+1)).attr("recordquery",json.stringify(recordquery));*/
  btndownload.click(function () {
   location.href = "/download?filename=" + file.name;
  });
  btndelete.click(function () {
   recordquery = jquery(this).attr("data-record-query");
   var dialogdiv = jquery("<div></div>");
   dialogdiv.dialog({
   autoopen: false,
   modal: true,
   width: 500,
   position: {my: "center", at: "center", of: jquery(".content_wrapper_hidden")},
   title: "文件删除",
   buttons: [
    {
    text: "确认",
    click: function () {
   jquery.post("/delete", file.name, function (data) {
    location.reload();
   });
   jquery(this).dialog("close");
   }
  },
   {
   text: "取消",
     click: function () {
   jquery(this).dialog("close");
   }
   }
   ]
  });
   var text = "确认删除 "+ file.name + "?";
   dialogdiv.text(text).dialog("open");
  });
  btndownload.appendto(operationcolumn);
  btndelete.appendto(operationcolumn);
  });
  jquery(".btn_download,.btn_delete").button();
 }

用于页面跳转的js代码：

//用于页码跳转方法
 function jumpage(totalpage,psize){
  var cpage=jquery("#page_no").val();
  if(0< cpage && cpage <= totalpage){
  getpages(cpage,psize);
  }
  else{
  alert("out of range");
  }
 }

计算文件的大小js：

function getsize(length) {
  var len, unit;
  if (length == 0) {
  len = 0;
  unit = "b";
  } else if (length < 1024) {
  len = length;
  unit = "b";
  } else if (length < (1024 * 1024)) {
  len = (length / 1024);
  unit = "kb";
  } else {
  len = (length / 1024 / 1024);
  unit = "mb";
  }
  return new number(len).tofixed(2) + unit;
 }

页面默认请求jquery：

//请求一次数据，然后存储到js变量中，保证只发送一条请求
 var datas;
 jquery(function() {
  $.ajax({
   type: "post",
   url: "/dopages",
   data: "{}",
   datatype: 'json',
   success: function(data) {
   datas = data;
   getpages(1,5);
   }
  });
 });

项目中用到了便于生成table的自己编写的js工具：

function createcolumn() {
 return jquery("<td></td>");
}
function createrow() {
 return jquery("<tr></tr>");
}
function createele(tag){
 return jquery("<"+tag+"></"+tag+">");
}
function reload(){
 window.location.reload();
} 
function tourl(url){
 window.location.href=url;
}
function isstring(obj){
 return typeof(obj) == "string";
}
function isobject(obj){
 return typeof(obj) == "object";
}
function fillselect(select, data, valuekey, textkey){
 var $select = isstring(select) ? jquery(select) : select;
 $select.empty();
 jquery.each(data, function(i, item){
  var value = (!isstring(item)) ? item[valuekey] : item;
  var text = (!isstring(item)) ? item[textkey] : item;
  var $op = createele("option").appendto($select);
  $op.text(text).val(value);
 })
}

common.js

为了美观考虑，项目中引用了jquery ui：

代码.github：https://github.com/wenchaozou/jqueryforpages

百度云链接：https://pan.baidu.com/s/1de5cj5n

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纯jQuery实现前端分页功能

2019年06月10日 | 移动技术网IT编程 | 我要评论

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