纯jQuery实现前端分页功能
编程学习 2021-07-04 18:31www.dzhlxh.cn编程入门
本文主要介绍了纯jquery实现前端分页功能的方法。具有很好的参考价值。狼蚁网站SEO优化跟着长沙网络推广一起来看下吧
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：
百度云链接：
以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持狼蚁SEO！