jQuery+Ajax实现限制查询间隔的方法

本文实例讲述了jQuery+Ajax实现限制查询间隔的方法。分享给大家供大家参考，具体如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Jquery20150305.aspx.cs" Inherits="Jquery20150305" %>
<!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 runat="server">
  <title>Jquery异步查询加载效果</title>
  <script src="JS/jquery-1.9.1.js" type="text/javascript"></script>
  <link href="Styles/Site.css" rel="stylesheet" type="text/css" />
  <style type="text/css">
  .span_query { cursor:pointer;}
  </style>
  <script type="text/javascript">
    $(function () {
      $(".span_query").click(function () {
        var val = $(this).attr("data-value");
        var id = $(this).attr("id");
        AjaxQuery($(this),val);
      });
    });
    function AjaxQuery(obj, v) {
      $.ajax({
        url: 'Ajax/Handler.ashx?queryType=score&queryValue=' + v,
        type: 'POST',
        dataType: 'text',
        timeout: 10000,
        cache: false,
        beforeSend: LoadFunction,
        error: erryFunction,
        success: succFunction
      })
      function LoadFunction() {
        obj.html('<img src="Images/loading02.gif" />');
      }
      function erryFunction() {
        obj.html('error');
      }
      function succFunction(tt) {
        obj.html('');
        obj.html(tt);
      }
    }
  </script>
</head>
<body>
  <form id="form1" runat="server">
  <div>
  <table style="width:100%" class="gvCss">
    <tr class="head"><td style="width:10%;">姓名</td><td style="width:30%;">语文</td><td style="width:30%;">数学</td><td style="width:30%;">英语</td></tr>
    <tr><td>张三</td>
      <td id="query1" title="点击查询" class="span_query" data-value="1">查询</td>
      <td id="query2" title="点击查询" class="span_query" data-value="2">查询</td>
      <td id="query3" title="点击查询" class="span_query" data-value="3">查询</td></tr>
  </table>
  </div>
  </form>
</body>
</html>

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
using System.Web.SessionState;
//Handler.ashx
public class Handler : IHttpHandler, IRequiresSessionState
{
  public void ProcessRequest(HttpContext context)
  {
    context.Response.ContentType = "text/plain";
    string queryType = context.Request["queryType"];
    string queryValue = context.Request["queryValue"];
    if (context.Session["preQuery"] == null) //第一次查询
    {
      context.Session["preQuery"] = queryValue + "@" + DateTime.Now.AddDays(-1);
      context.Session["currQuery"] = queryValue + "@" + DateTime.Now;
    }
    else //存在上次查询
    {
      string[] preStrs = context.Session["currQuery"].ToString().Split('@');
      context.Session["preQuery"] = queryValue + "@" + preStrs[1]; //重置为当前查询参数+上次查询时间
      context.Session["currQuery"] = queryValue + "@" + DateTime.Now;
    }
    string[] strs=context.Session["preQuery"].ToString().Split('@');
    if (strs[0] == queryValue) //同一请求限制查询间隔
    {
      DateTime preTime = Convert.ToDateTime(strs[1]);
      DateTime nowTime = DateTime.Now;
      bool flag = CheckQueryTimeSpan(preTime, nowTime, 3);
      if (flag)
      {
        context.Response.Write("查询间隔3秒");
      }
      else
      {
        context.Response.Write("98");
      }
    }
    context.Response.End();
  }
  /// <summary>
  /// 判断本次查询和上次查询间隔是否小于指定秒数
  /// </summary>
  /// <param name="preTime">上次查询时间</param>
  /// <param name="nowTime">本次查询时间</param>
  /// <param name="timeSpan">指定秒数</param>
  /// <returns></returns>
  public bool CheckQueryTimeSpan(DateTime preTime, DateTime nowTime, int timeSpan)
  {
    TimeSpan ts = nowTime - preTime;
    int difference = ts.Seconds;
    bool flag = (difference < timeSpan) ? true : false;
    return flag;
  }
  public bool IsReusable {
    get {
      return false;
    }
  }
}

更多关于jQuery相关内容感兴趣的读者可查看本站专题：《jquery中Ajax用法总结》、《jQuery表格(table)操作技巧汇总》、《jQuery拖拽特效与技巧总结》、《jQuery扩展技巧总结》、《jQuery常见经典特效汇总》、《jQuery动画与特效用法总结》、《jquery选择器用法总结》及《jQuery常用插件及用法总结》

希望本文所述对大家jQuery程序设计有所帮助。