• 纯手写实现ajax分页功能


    前言

    最近用到了这个功能,百度大半天,网上的不是有各种问题就是需要引入其他的插件,无奈,只能自己写,大致功能已经完成。前端页面用bootstrap做样式,分页功能用ajax实现,没用其他插件哦,只引入引这些:

        <link href="bootstrap-3.3.7-dist/css/bootstrap.css" rel="stylesheet" />
        <script src="js/jquery-3.3.1.min.js" type="text/javascript"></script>
        <script src="bootstrap-3.3.7-dist/js/bootstrap.min.js" type="text/javascript"></script>

    简介

    相关概念:

    ajax:异步的javascript和xml 指的是在不刷新网页的情况下,可以和服务器端通信,局部刷新。

    bootstrap:Bootstrap 是最受欢迎的 HTML、CSS 和 JS 框架,用于开发响应式布局、移动设备优先的 WEB 项目。

    简析 

    主要思路就是写两个ajax方法,一个ajax方法负责更新页数的同时调用另外一个ajax方法,另一个ajax方法负责加载页面数据。

    代码

    <!doctype html>
    <html>
    
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta name="viewport" content="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0,user-scalable=no">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <meta name="format-detection" content="telephone=no">
        <title>文章列表</title>
        <link href="css/style.css" rel="stylesheet" />
        <link href="bootstrap-3.3.7-dist/css/bootstrap.css" rel="stylesheet" />
        <script src="js/jquery-3.3.1.min.js" type="text/javascript"></script>
        <script src="bootstrap-3.3.7-dist/js/bootstrap.min.js" type="text/javascript"></script>
        <script type="text/javascript">
        function rows(np){
            $.ajax({
                url : '../article/rows',
                type : 'POST',
                dataType : 'json',
                /* data : params, */
                success : function(data) {
                    var pageCount = data%5 == 0 ? data/5 : (data/5+1);
                    var codePage = "";
                    for (var j=np-2; j<=np+2; j++) {
                        if(j > pageCount && j > 0){
                            codePage += 
                                "<li><a id='"+(j-5)+"' onclick='pages("+(j-5)+");rows("+(j-5)+");'>"+(j-5)+"</a></li>";
                        }
                    }
                    for (var j=np-2; j<=np+2; j++) {
                        if(j >= 1 && j <= pageCount) {
                            codePage += 
                                "<li><a id='"+j+"' onclick='pages("+j+");rows("+j+");'>"+j+"</a></li>";
                        }
                    }
                    for (var j=np-2; j<=np+2; j++) {
                        if(j < 1 && j <= pageCount){
                            codePage += 
                                "<li><a id='"+(j+5)+"' onclick='pages("+(j+5)+");rows("+(j+5)+");'>"+(j+5)+"</a></li>";
                        }
                    }
                    
                    $("#page-size").html(codePage); 
                },
                error : function() {
                    alert("rows出错了!");
                }
            });
        }
        
        function pages(p){
            $.ajax({
                url : '../article/page',
                type : 'POST',
                dataType : 'json',
                data : {"pageNow":p},
                success : function(data) {
                    var code = "";
                    for (var i=0; i<data.length; i++) {
                    code += 
                        "<div>
    " + 
                        "<h2>
    " + 
                        "    <a href='articleDetail.html?aid="+data[i].articleId+"'>"+data[i].articleTitle+"</a>
    " + 
                        "</h2>
    " + 
                        "<h5>
    " + 
                        "    <span class="glyphicon glyphicon-calendar" aria-hidden="true">"+data[i].nowDate+"</span>&nbsp;&nbsp;
    " + 
                        "    <span class="glyphicon glyphicon-user" aria-hidden="true">"+data[i].user.userName+"</span>
    " + 
                        "</h5>
    " + 
                        "<p>"+data[i].articleSummary+"</p>
    " + 
                        "<a href='articleDetail.html?aid="+data[i].articleId+"'>
    " + 
                        "    <strong>More</strong>
    " + 
                        "    <span class="glyphicon glyphicon-menu-right" aria-hidden="true"></span>
    " + 
                        "</a>
    " + 
                        "<hr />
    " + 
                        "</div>";
                    }
                    $("#tableBody").html(code);
                },
                error : function() {
                    alert("page出错了!");
                }
            });
        }
        
        $(document).ready(function () {
            rows(1);
            pages(1);
        });
        
        </script>
    </head>
    
    <body>
        <nav class="navbar navbar-inverse" role="navigation">
            <div class="container-fluid">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#example-navbar-collapse">
                        <span class="sr-only">切换导航</span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>
                    <a class="navbar-brand" href="#">动态</a>
                </div>
                <div class="collapse navbar-collapse" id="example-navbar-collapse">
                    <ul class="nav navbar-nav navbar-right">
                        <li><a href="#"><span class="glyphicon glyphicon-user"></span> 注册</a></li>
                        <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> 登录</a></li>
                    </ul>
                    <ul class="nav navbar-nav">
                        <li class="active"><a href="#">首页</a></li>
                        <li><a href="#">动态</a></li>
                        <li class="dropdown">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                                管理 <b class="caret"></b>
                            </a>
                            <ul class="dropdown-menu">
                                <li><a href="#">文章</a></li>
                                <li><a href="#">评论</a></li>
                            </ul>
                        </li>
                    </ul>
                </div>
            </div>
        </nav>
        <div class="container">
            <div class="row">
    
    
                <div class="col-xs-12 col-sm-10 col-sm-offset-1 col-md-10 col-md-offset-1">
    
                    <div class="list-group" id="tableBody">
    
                        <div>
                            <h2>
                                <a href="#">在教室内活动应注意安全</a>
                            </h2>
                            <h5> <span class="glyphicon glyphicon-calendar" aria-hidden="true">2018-02-10</span>
                                <span class="glyphicon glyphicon-user" aria-hidden="true">SpringBoot Redis</span>
                            </h5>
                            <p>在教室内活动,有许多看起来细微的事情值得同学们注意,否则,在教室里也同样容易发生危险。以下就是几个同学们需要注意的几点:
                                1. 防磕碰。目前大多数教室空间比较狭小,又置放了许多桌椅、饮水机等用品,所以不应在教室中追逐、打闹,做剧烈的运动和游戏,防止磕碰受伤。
                                2.防滑、防摔。教室地板比较光滑的,要注意防止滑倒受伤;需要登高打扫卫生、取放物品时,要请他人加以保护,注意防止摔伤。
                                3.防坠落。无论教室是否处于高层,都不要将身体探出阳台或者窗外,谨防不慎发生坠楼的危险。
                                4.防挤压。教室的门、窗户在开关时容易压到手,也应当处处小心,要轻轻地开关门窗,还先留意会不会夹到他人的手。
                            </p>
                            <a href="#">
                                <strong>More</strong>
                                <span class="glyphicon glyphicon-menu-right" aria-hidden="true"></span>
                            </a>
                            <hr />
                        </div>
                        <div>
                            <h2>
                                <a href="#">在教室内活动应注意安全</a>
                            </h2>
                            <h5> <span class="glyphicon glyphicon-calendar" aria-hidden="true">2018-02-10</span>
                                <span class="glyphicon glyphicon-user" aria-hidden="true">SpringBoot Redis</span>
                            </h5>
                            <p>在教室内活动,有许多看起来细微的事情值得同学们注意,否则,在教室里也同样容易发生危险。以下就是几个同学们需要注意的几点:
                                1. 防磕碰。目前大多数教室空间比较狭小,又置放了许多桌椅、饮水机等用品,所以不应在教室中追逐、打闹,做剧烈的运动和游戏,防止磕碰受伤。
                                2.防滑、防摔。教室地板比较光滑的,要注意防止滑倒受伤;需要登高打扫卫生、取放物品时,要请他人加以保护,注意防止摔伤。
                                3.防坠落。无论教室是否处于高层,都不要将身体探出阳台或者窗外,谨防不慎发生坠楼的危险。
                                4.防挤压。教室的门、窗户在开关时容易压到手,也应当处处小心,要轻轻地开关门窗,还先留意会不会夹到他人的手。
                            </p>
                            <a href="#">
                                <strong>More</strong>
                                <span class="glyphicon glyphicon-menu-right" aria-hidden="true"></span>
                            </a>
                            <hr />
                        </div>
    
                    </div>
                    <nav aria-label="Page navigation" class="text-center">
                        <ul class="pagination pagination-lg" id="page-size">
                            <li><a href="#">首页</a></li>
                            <li><a href="#">&laquo;上一页</a></li>
                            <li><a href="#">1</a></li>
                            <li><a href="#">2</a></li>
                            <li><a href="#">3</a></li>
                            <li><a href="#">4</a></li>
                            <li><a href="#">5</a></li>
                            <li><a href="#">下一页&raquo;</a></li>
                            <li><a href="#">尾页</a></li>
                        </ul>
                    </nav>
                </div>
            </div>
        </div>
        <nav class="navbar navbar-default" role="navigation">
            <div class="container-fluid">
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="#">Copyright &copy; 2019 &nbsp; 朱学良 &nbsp; 蒙ICP备15101216号-1 &nbsp;</a></li>
                </ul>
            </div>
        </nav>
    </body>
    
    </html>

    后台:处理数据(SSM框架写的,看吧)

    package com.securty.imut.controller;
    
    
    
    import java.io.File;
    import java.io.IOException;
    import java.io.InputStream;
    import java.sql.Timestamp;
    import java.util.List;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.apache.commons.io.FileUtils;
    import org.apache.log4j.helpers.LogLog;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.multipart.MultipartFile;
    
    import com.securty.imut.bean.Article;
    import com.securty.imut.service.ArticleService;
    import com.securty.imut.util.WangEditor;
    
     
    @Controller
    @RequestMapping(value="/article")
    public class ArticleController {
     
        @Autowired
        private ArticleService articleService;
        
        /**
         * 查找所有
         * @return
         */
        @RequestMapping(value="/list")
        @ResponseBody
        public List<Article> list(){
            List<Article> list = articleService.findAll();
            return list;
        }
        
        /**
         * 查找
         * @return
         */
        @RequestMapping(value="/page")
        @ResponseBody
        public List<Article> page(HttpServletRequest request){
            Article article = new Article();
            Timestamp nowDate = new Timestamp(System.currentTimeMillis());
            article.setNowDate(nowDate);
            String pn = request.getParameter("pageNow") == null ? String.valueOf(1) : request.getParameter("pageNow");
            int pageNow = Integer.parseInt(pn);
            int pageSize = 5;
            int startRows = pageSize*(pageNow-1);
            List<Article> list = articleService.queryPage(startRows);
            return list;
        }
        
        /**
         * 查找
         * @return
         */
        @RequestMapping(value="/rows")
        @ResponseBody
        public int rows(HttpServletRequest request){
            return articleService.getRowCount();
        }
        
        @RequestMapping(value="/add")
        @ResponseBody
        public int add(Article article){
            return articleService.addArticle(article);
        }
        
        @RequestMapping(value="/update")
        @ResponseBody
        public int update(Article article){
            return articleService.updateArticleById(article);
        }
        
        @RequestMapping(value="/read")
        @ResponseBody
        public Article read(Article article){
            return articleService.selectArticlesById(article);
        }
        
        @RequestMapping(value="/delete")
        @ResponseBody
        public int delete(Integer aid){
            return articleService.deleteArticleById(aid);
        }
        
        @RequestMapping(value = "/upload",method=RequestMethod.POST)
        @ResponseBody
        public WangEditor uploadFile(
                @RequestParam("myFile") MultipartFile multipartFile,
                HttpServletRequest request) {
     
            try {
                // 获取项目路径
                String realPath = request.getSession().getServletContext()
                        .getRealPath("");
                InputStream inputStream = multipartFile.getInputStream();
                String contextPath = request.getContextPath();
                // 服务器根目录的路径
                String path = realPath.replace(contextPath.substring(1), "");
                // 根目录下新建文件夹upload,存放上传图片
                String uploadPath = path + "upload";
                // 获取文件名称
                String filename = multipartFile.getOriginalFilename();
                // 将文件上传的服务器根目录下的upload文件夹
                File file = new File(uploadPath, filename);
                FileUtils.copyInputStreamToFile(inputStream, file);
                // 返回图片访问路径
                String url = request.getScheme() + "://" + request.getServerName()
                        + ":" + request.getServerPort() + "/upload/" + filename;
                
                String [] str = {url};
                WangEditor we = new WangEditor(str);
                return we;
            } catch (IOException e) {
                LogLog.error("上传文件失败", e);
            }
            return null;
     
        }
    }

    效果

    参考地址

    https://github.com/Aizhuxueliang/security   

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  • 原文地址:https://www.cnblogs.com/nqdxt/p/11352881.html
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