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利用XmlHttp获取服务器数据库数据以表格的方式返回客户的代码示例

Admin | 2009-3-4 20:53:43 | 被阅次数 | 7489

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  以下示例,不使用任何的无刷新组件,直接通过XmlHttp完成!

  一、JS文件代码

// JScript 文件
<!--
var MyXmlHttp= false;
try
{
  MyXmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e)
{
  try
  {
    MyXmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
  }
  catch(e2)
  {
    MyXmlHttp = false;
    }
}
if (!MyXmlHttp && typeof XMLHttpRequest != 'undefined')
{
  MyXmlHttp = new XMLHttpRequest();
}

function OnMessageBack()
{
   //判断请求状态及HTTP状态是否都能满足条件

  if (MyXmlHttp.readystate==4 && MyXmlHttp.status==200)

  {
    //将返回的文本打印到页面上
    document.write (MyXmlHttp.responsetext);

   }
}

function SendToServer()
{
  var url ="文件名.ashx";
  MyXmlHttp.open("GET", url, false);
  MyXmlHttp.onreadystatechange = GetServerData;
  MyXmlHttp.send(null); 
}

function GetServerData()
{
  if (MyXmlHttp.readyState < 4)
  {
    document.getElementById("px").innerHTML="正在加载数据……请稍后!";
  }
  if (MyXmlHttp.readyState == 4)
  {
    var response = MyXmlHttp.responseText;
    var pp = document.getElementById("px");
    if(response!="")
    {
        var text="";
      var array=response.split(";");
      for(var i=0;i<array.length;i++)
      {
        //得到数据
        var name=array[i].split(",")[1];
        var datetime=array[i].split(",")[3];
        var suggestion=array[i].split(",")[2];
        
        //下面不用说了吧
        text+="<div id='SuggestionListDiv'>用户名:"+name+";评论时间:"+datetime+";<br>评论内容:<br>"+suggestion+"</div><br>";
      }
      pp.innerHTML=text;
     }
     else
     {
       pp.innerHTML="目前尚无任何评论…";
     }
   }
}
-->

  二、ASHX文件代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.IO;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Security; //加密
using System.Text;
using System.Data.SqlClient;
using System.Web.SessionState;

public class GetSuggestion : IHttpHandler,IRequiresSessionState
{
   
    public void ProcessRequest (HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        //context.Response.Write("Hello World");
        DataTable dt = GetSqlDataTable();
        string response = string.Empty;
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            response += dt.Rows[i][0].ToString() + "," + dt.Rows[i][1].ToString() + "," + dt.Rows[i][2].ToString() + "," + dt.Rows[i][3].ToString() + ";";
        }
        if (response.EndsWith(";"))
        {
            response = response.Substring(0, response.Length - 1);
        }
        context.Response.Write(response);
        context.Response.End();
    }
    private DataTable GetSqlDataTable()
    {
        DataClass.SqlDataClas MyClass = new DataClass.SqlDataClas();
        SqlConnection conn = new SqlConnection(MyClass.GetMyDataBaseConStr());
        string query = "select 字段1,字段2,字段3,字段4 from 表名 where YouID=@MyID order by ID desc";
        SqlCommand cmd = new SqlCommand(query, conn);
        cmd.Parameters.Add(new SqlParameter("@MyID", SqlDbType.VarChar, 8000));
        cmd.Parameters["@MyID"].Value = HttpContext.Current.Session["变量名称"].ToString().Trim();
        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        try
        {
            conn.Open();
            adapter.Fill(dt);
            return dt;
        }
        catch
        {
            throw;
        }
        finally
        {
            cmd.Dispose();
            conn.Close();
        }
    }


    public bool IsReusable {
        get
        {
            return false;
        }
    }

}

  三、ASPX或HTML页面

  里面仅需要一个按钮和一个div即可!

  “<input id="OK" type="button" value="显示数据" onclick="SendToServer()"/>”

  <div id=”px”></div>


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