使用jQuery和Ajax请求实现分页效果-优快云博客

在要求分页的程序中，我们一般会知道如下几个数据的参数：

总记录数count

每一页要显示的记录数：size

当前页：num

总页数我们可以通过count和size得到，在JS中可以使用Math.ceil()

编写我们的JS分页脚本page.js
//定义一个Page函数，接收两个参数，总记录数和参数列表

var Page = function(count,params){
	this.size=10;//初始化每一页显示10条数据
	this.num=1;//当前页为第一页
	this.count=count;
	this.url;//定义一个url
	this.cacheKey=Math.random();//定义一个随机数，保证在ajax传输的时候唯一地址，防止缓存提交
	this.sumNum = function(){//得到总页数
		return Math.ceil(this.count/this.size);
	};
	this.params = {};//定义一个参数列表
	this.first=function(){//首页
		this.show(1);
	}
	this.last=function(){//最后一页
		this.show(this.sumNum());
	}
	this.next=function() {//下一页
		this.show(this.num + 1);
	}
	this.prev=function() {//上一页
		this.show(this.num - 1);
	}
	this.show=function(num) {//处理页面函数
		if(num>0&&num<=this.sumNum()){
			this.num = num;
                        //构造页面地址参数
                       var args = {'pager.offset':(this.num-1)*this.size,'page.size':this.size,'_temp':this.cacheKey};
			for(p in this.params){
				args[p] = this.params[p];
			}
			$.get(this.url,args,function(data){
				showJson(data);//将异步请求的json数据显示出来
			});
			delete args;
		}
	}
	this.reload=function(){//重新加载
		this.clearCahce();//清除缓存
		if(num>0&&num<=this.sumNum()){
			this.show(this.num);
		}else{
			this.show(1);
		}
	}
	this.clearCahce=function(){
		this.cacheKey=Math.random();//改变key的值
	}
	this.bindForm=function(id){//绑定到表单中中
		$(function(){
			$('#'+id+' input[type=text]').each(function(i,input){
				if($(input).val()!=''){
					page.params[$(input).attr('name')] = $(input).val();
				}
			});
			$('#'+id+' input:checked').each(function(i,input){
				if($(input).val()!=''){
					page.params[$(input).attr('name')] = $(input).val();
				}
			});
			$('#'+id+' select').each(function(i,s){
				if($(s).find('option:selected').val()!=''){
					page.params[$(s).attr('name')] = $(s).find('option:selected').val();
				}
			});
			$('#'+id).bind('submit',function(f){
				for(var i=0;i<form.length;i++){
					if(form[i].value==''){
						$(form[i]).removeAttr('name');
					}
				}
			});
		});
	}
}

要在前台页面做显示，我们一般是有我们定义的分页样式，例如：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <title> New Document </title>
  <meta name="Generator" content="EditPlus">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
 </head>

 <body>
    <table>
	  <tr>
	    <th>编号</th>
	    <th>姓名</th>
		<th>年龄</th>
		<th>性别</th>
	  </tr>
	<c:forEach items="${users}" var="users">
	  <tr>
	    <td>${users.userId}</td>
		<td>${users.userName}</td>
		<td>${users.userAge}</td>
		<td>${users.userSex}</td>
	  </tr>
	</c:forEach>
	<table>
    <div class="flickr">
       当前页：<span id="currentPage">0</span>/<span id="sumPage">0</span> 页
       	       <a href="javascript:void(0);" onclick="page.first();">首页</a>
	       <a href="javascript:void(0);" onclick="page.prev();">上页</a>
       	       <a href="javascript:void(0);" onclick="page.next();">下页</a>
	       <a href="javascript:void(0);" onclick="page.last();">末页</a>
       	       总共<span id="count" style="color: red;"></span>条
    </div>
 </body>
</html>

调用page.js和编写我们的脚本语句
<script type="text/javascript" src="page.js"></script>

<script type="text/javascript">
	var basePath = "<%=preBasePath%>";
	var page = new Page();
	
	//初始化菜谱Page
	function initPage(count){
		page.count = count;
		page.url = basePath+"orderAction!ajaxDish.do?resId="+resId+"&preId="+preId;
		$('#currentPage').html(page.num);
		$('#sumPage').html(page.sumNum());
		$('#count').html(page.count);
	}

	$(function(){
		initPage(${orderPageModel.count});
	});
</script>

我们在OrderAction中编写我们的ajaxDish方法

	/**
	 * Ajax 获取菜谱
	 */
	public String ajaxDish() throws Exception{
		PrintWriter writer = response.getWriter();
		try{
			int resId = Integer.parseInt(request.getParameter("resId"));
			int preId = Integer.parseInt(request.getParameter("preId"));
			PageModel pageModel = null;
			if(preId==0){ //查询全部
				pageModel = restaurantDishDao.findPageModelDishes(resId);
			}else{
				pageModel = restaurantDishDao.findPageModelDishesOfPreferentialId(resId, preId);
			}
			JSONObject object = new JSONObject();
			object.accumulate("resId", resId);
			object.accumulate("preId", preId);
			object.accumulate("count", pageModel.getCount());
			object.accumulate("data", pageModel.getDatas());
			response.setContentType("text/plain");
			response.setCharacterEncoding("UTF-8");
			writer.print(object.toString());
		}catch(Exception e){
			throw e;
		}finally{
			writer.flush();
			writer.close();
		}
		return null;
	}