Use JQuery to write a simple asynchronous paging plug-in

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Use JQuery to write a simple asynchronous paging plug-in_jquery

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May 16, 2016 pm 03:11 PM

I wrote a Jquery asynchronous paging plug-in and shared it with me. Please let me know if there are any imperfections.
Take user paging as an example. Let’s take a look at the effect first. The first page is:

Next page or after clicking on the second page:

After clicking on the last page:

Is the effect okay? Let’s see how to use it. First, there must be a Page model in the background:
Page.java：

public class Page { 
   
 /** 
  * 当前页号 
  */
 private int currPageNum = 1; 
   
   
 /** 
  * 总记录数 
  */
 private int totalRowSize = 0; 
   
 /** 
  * 每页记录数 
  */
 private int pageRowSize = 10; 
   
 public int getCurrPageNum() { 
  return currPageNum; 
 } 
  
 public void setCurrPageNum(int currPageNum) { 
  this.currPageNum = currPageNum; 
 } 
  
 public int getTotalPageNum() { 
  int total = (totalRowSize%pageRowSize==0)&#63;(totalRowSize/pageRowSize):(totalRowSize/pageRowSize+1); 
  return total; 
 } 
  
 public int getTotalRowSize() { 
  return totalRowSize; 
 } 
  
 public void setTotalRowSize(int totalRowSize) { 
  this.totalRowSize = totalRowSize; 
 } 
  
 public int getPageRowSize() { 
  return pageRowSize; 
 } 
  
 public void setPageRowSize(int pageRowSize) { 
  this.pageRowSize = pageRowSize; 
 } 
  
 public int getFirstResult(){ 
  if(getCurrPageNum()<=0) return 0; 
    
  return getPageRowSize() * (getCurrPageNum() - 1); 
 } 
  
 public int getMaxResult() { 
  return this.getFirstResult()+this.getPageRowSize(); 
 } 
   
} 

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Then look at list_user.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
 <head> 
 <title>异步分页</title> 
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
 <link href="../css/local.css" rel="stylesheet" type="text/css" /> 
 <script type="text/javascript" src="../js/jquery-1.4.2.min.js"></script> 
 <script type="text/javascript" src="../js/asyn_page.js"></script> 
 <script type="text/javascript"> 
 var totalRowSize = ${totalRowSize}; 
 $(document).ready(function(){ 
  $("#pageWidget").asynPage("/user/findUser_asyn.action","#tbody",buildHtml,totalRowSize); 
 }); 
   
 //构建内容 
 function buildHtml(users){ 
  $.each(users,function(i,user){ 
   var tr = [ 
    '<tr>', 
     '<td>',user.userId,'</td>', 
     '<td>',user.username,'</td>', 
     '<td>',user.sex,'</td>', 
     '<td>',user.age,'</td>', 
     '<td>',user.email,'</td>', 
     '<td>',user.address,'</td>', 
     '<td>',user.registerTime,'</td>', 
     '<td></td>', 
    '</tr>'
   ].join(''); 
   $("#tbody").append(tr); 
  }); 
 } 
 </script> 
 </head> 
 <body> 
 <table> 
  <thead> 
  <tr> 
   <th>ID</th> 
   <th>用户名</th> 
   <th>性别</th> 
   <th>年龄</th> 
   <th>Email</th> 
   <th>地址</th> 
   <th>注册时间</th> 
   <th>操作</th> 
  </tr> 
  </thead> 
  <tbody id="tbody"></tbody> 
 </table> 
 <div id="pageWidget" class="page"></div> 
 </body> 
</html> 

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You can see that the element with the id of tbody is used as a paging content display container, and the element with the id of pageWidget is used as a paging control display container.
Then a buildHtml() function is provided to specifically build the paging content.
Using the asynchronous paging plug-in is very simple, just call it like this:

1	`$("#pageWidget").asynPage("/user/findUser_asyn.action","#tbody",buildHtml,totalRowSize);`

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This is the simplest call. You can also pass additional query parameters and customize the number of records displayed on each page. For specific usage, see the detailed introduction of the plug-in.
The following is the content of the asynPage plug-in:

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/* 
 * ===================AJAX异步分页================= 
 * 
 * Copyright 2012 8 23, zhutx 
 * 
 * 假设id为pageWidget的div是你放置分页控件的容器，则按如下形式调用： 
 * $("#pageWidget").asynPage("/user/findUser_asyn.action","#tbody",buildHtml,totalRowSize,{"pageRowSize":10}); 
 * 参数说明： 
 * ------------Required----------- 
 * 参数一：请求URL 
 * 参数二：渲染结果集的页面容器 
 * 参数三：负责渲染结果集到页面的函数 
 * 参数四：总记录数 
 * ------------Optional----------- 
 * 参数五(json对象)： 
 * 属性pageRowSize:每页记录数(不配置，则默认为20) 
 * 属性param:请求参数(json格式) 
 */
(function($){ 
 var settings; 
 var page; 
 var paramStr; 
   
 $.fn.asynPage = function(url,contentContainer,buildHtml_fun,totalRowSize,callerSettings){ 
   
  settings = $.extend({ 
   currPageNum:1, 
   pageRowSize:20, 
   param:null 
  },callerSettings||{}); 
   
  settings.contentContainer = $(contentContainer); 
  settings.url = url; 
  settings.pageWidget = this; 
  settings.totalRowSize = totalRowSize; 
  settings.buildHtml_fun = buildHtml_fun; 
    
  page = new Page(settings.currPageNum,settings.totalRowSize,settings.pageRowSize); 
    
  paramStr = makeParamStr(settings.param); 
    
  //开始获取数据 
  fetchData(page.getCurrPageNum()); 
    
  return this; 
 }; 
   
 /* 将json转换为请求参数字符串 */
 var trunParamConfig2RequestParamStr = function(json){ 
  var str = ""; 
  for(key in json){ 
   if(str==""){ 
    str += key+"="+json[key]; 
   }else{ 
    str += "&"+key+"="+json[key]; 
   } 
  } 
  return str; 
 }; 
   
 /* 将配置参数拼接为请求字符串 */
 var makeParamStr = function(param_json){ 
  if(param_json==null){ 
   return ""; 
  }else{ 
   return trunParamConfig2RequestParamStr(param_json); 
  } 
 }; 
   
 /* 
  * 负责获取后台数据，获取完毕后会触发构建分页控件 
  */
 var fetchData = function(currPageNum){ 
    
  page.setCurrPageNum(currPageNum); 
  var firstResult = page.getFirstResult(); 
  var maxResult = page.getMaxResult(); 
  var pageRowSize = page.getPageRowSize(); 
    
  var data = null; 
  if(paramStr){ 
   data = paramStr + "&page.currPageNum="+currPageNum+"&page.pageRowSize="+pageRowSize+"&page.firstResult="+firstResult+"&page.maxResult="+maxResult; 
  }else{ 
   data = "page.currPageNum="+currPageNum+"&page.pageRowSize="+pageRowSize+"&page.firstResult="+firstResult+"&page.maxResult="+maxResult; 
  } 
    
  $.ajax({ 
   type :"POST", 
   url : settings.url, 
   data :data, 
   success :function(datas){ 
    settings.contentContainer.empty(); 
    settings.buildHtml_fun(datas); 
    buildPageWidget(page);//触发构建分页控件 
   }, 
   error:function(xmlHttpRequest,textStatus,errorThrown){ 
    if(textStatus == "error"){ 
     var error = eval('('+xmlHttpRequest.responseText+')'); 
     alert("Sorry："+error.errorCode+"，"+error.message+"！"); 
    } 
   } 
  }); 
 }; 
   
 var trunTargetPage = function(pageNum){ 
  fetchData(pageNum); 
 } 
   
 /* 为分页控件绑定事件 */
 var bindEvent = function(){ 
  var links = settings.pageWidget.find("a"); 
  $.each(links,function(i,link){ 
   var link = $(link); 
   var pageNum = link.attr("pageNum"); 
   link.click(function(){ 
    trunTargetPage(pageNum); 
   }); 
  }); 
 } 
   
 /* 构建分页控件的具体算法实现 */
 var buildPageWidget = function(page){ 
    
  //构建分页控件前，先清理现有控件 
  settings.pageWidget.empty(); 
    
  /* --------------- 下面开始进入真正的分页控件构建过程 -------------- */
    
  /* --------------- 1.开始：构建描述信息（如“共？页，？条记录”） ----------------- */
  settings.pageWidget.append("<div class='total'>共<span>"+page.getTotalPageNum()+"</span>页 <span>"+page.getTotalRowSize()+"</span>条记录</div>"); 
  settings.pageWidget.append("<ul>"); 
  /* --------------- 1.结束：构建描述信息（如“共？页，？条记录”） ----------------- */
    
  /* --------------- 2.开始：构建“首页”和“上一页”控件 ------------- */
  var currPageNum = Number(page.getCurrPageNum()); 
  var totalPageNum = Number(page.getTotalPageNum()); 
    
  if(currPageNum==1){ 
   //如果你希望当前页是第一页的时候，也允许“首页”和“上一页”控件出现，则可以在这里进行补充 
  }else{ 
   settings.pageWidget.find("ul").append("<li><a id='' pageNum='1' href='javascript:void(0);' title='首页' class='first'>首页</a></li>"); 
   settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+(currPageNum-1)+"' href='javascript:void(0);' title='上一页' class='prev'>上一页</a></li>"); 
  } 
  /* --------------- 2.结束：构建“首页”和“上一页”控件 ------------- */
    
  /* --------------- 3.开始：构建分页数字控件 -------------- */
  if(totalPageNum<10){ 
   for(var i=1;i<=totalPageNum;i++){ 
    if(i==currPageNum){ 
     settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void(0);' title='' class='current'>"+i+"</a></li>"); 
    }else{ 
     settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void(0);' title='' class='javascript:trunTargetPage("+i+");'>"+i+"</a></li>"); 
    } 
   } 
  //如果总页数>=10 
  }else{ 
   //如果当前页小于5，则显示1-9项，且记忆当前项 
   if(currPageNum<5){ 
    for(var i =1;i<10;i++){ 
     if(i==currPageNum){ 
      settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void(0);' title='' class='current'>"+i+"</a></li>"); 
     }else{ 
      settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void(0);' title='' class=''>"+i+"</a></li>"); 
     } 
    } 
   //如果当前页>=5，且总页数与当前页的差<4 
   }else if(totalPageNum-currPageNum<4){ 
    for(var i=totalPageNum-8;i<=totalPageNum;i++){ 
     if(i==currPageNum){ 
      settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void(0);' title='' class='current'>"+i+"</a></li>"); 
     }else{ 
      settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void(0);' title='' class=''>"+i+"</a></li>"); 
     } 
    } 
   //如果当前页>=5，则显示围绕当前页的9项，且记忆当前项  
   }else{ 
    for(var i=currPageNum-4;i<currPageNum+5;i++){ 
     if(i==currPageNum){ 
      settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void(0);' title='' class='current'>"+i+"</a></li>"); 
     }else{ 
      settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+i+"' href='javascript:void("+i+");' title='' class=''>"+i+"</a></li>"); 
     } 
    } 
   } 
  } 
  /* --------------- 3.结束：构建分页数字控件 -------------- */
    
  /* --------------- 4.开始：构建“下一页”和“尾页”控件 ------------- */
  if(totalPageNum==currPageNum){ 
   //如果你希望当前页是最后一页的时候，也允许“尾页”和“下一页”控件出现，则可以在这里进行补充 
  }else{ 
   settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+(currPageNum+1)+"' href='javascript:void(0);' title='下一页' class='next'>下一页</a></li>"); 
   settings.pageWidget.find("ul").append("<li><a id='' pageNum='"+totalPageNum+"' href='javascript:void(0);' title='尾页' class='last'>尾页</a></li>"); 
  } 
  /* --------------- 4.结束：构建“下一页”和“尾页”控件 ------------- */
    
  //还要为控件绑定点击事件 
  bindEvent(); 
 } 
   
})(jQuery); 
  
/* 
 * Page类 
 */
function Page(currPageNum,totalRowSize,pageRowSize){ 
 this.currPageNum = currPageNum; 
 this.totalRowSize = totalRowSize; 
 this.pageRowSize = pageRowSize; 
} 
Page.prototype.getCurrPageNum = function(){ 
 return this.currPageNum; 
}; 
Page.prototype.setCurrPageNum = function(currPageNum){ 
 this.currPageNum = currPageNum; 
}; 
Page.prototype.getTotalPageNum = function(){ 
 return (this.totalRowSize%this.pageRowSize==0)&#63;(this.totalRowSize/this.pageRowSize):(Math.floor(this.totalRowSize/this.pageRowSize)+1); 
}; 
Page.prototype.getTotalRowSize = function(){ 
 return this.totalRowSize; 
}; 
Page.prototype.setTotalRowSize = function(totalRowSize){ 
 this.totalRowSize = totalRowSize; 
}; 
Page.prototype.getPageRowSize = function(){ 
 return this.pageRowSize; 
}; 
Page.prototype.setPageRowSize = function(pageRowSize){ 
 this.pageRowSize = pageRowSize; 
}; 
Page.prototype.getFirstResult = function(){ 
 if(this.getCurrPageNum()<=0) return 0; 
 return this.getPageRowSize() * (this.getCurrPageNum() - 1); 
}; 
Page.prototype.getMaxResult = function(){ 
 return this.getFirstResult() + this.getPageRowSize(); 
};

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