ajax+asp.net+mssql实现的ajax无刷新聊天室，支持html web编辑器。供大家参考下。不过有个小问题，就是firefox下如果使用快捷键ctrl+enter发送信息时，如果不延时调用发送函数，会弹出ff的下载对话框，奇怪。
JScript codeif(e.ctrlKey&&e.keyCode==13){
e.preventDefault();
e.stopPropagation();
setTimeout("Showbo.Chat.send()",50);//在ff中马上使用alert提示时尽然弹出下载工具，奇怪.
return false;}
},false);
为了加快速度，使用了存储过程。
asp及php版本请看下面的文章
ajax+asp+mssql无刷新聊天室
ajax+php+mssql无刷新聊天室
要使用不同的动态页面，只需要更改lib.js文件中RequstUrl变量的值即可。
完整示例下载
效果如下
内容长度限制，所以就不贴出所有的代码了，要看全部代码请下载示例或者查看下面这篇文章
ajax+asp.net+mssql无刷新聊天室
下面贴出C#的主要的代码，其他版本请查看上面的链接
ajax.cs
C# codeusing System;
using System.Web;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
public class Ajax
{
private static bool IsNull(string v)
{
if (v == null || v.Trim() == "") return true;
else return false;
}
private static string Js(string v)
{
return v.Replace("'", "'");
}
public static string Login()
{
HttpRequest Request = HttpContext.Current.Request;
string rStr = "";
string UserName = Request.Form["nn"];
if (IsNull(UserName))
{
rStr = "success:false,err:'昵称不能为空！'";
}
else if (UserName.Length > 20)
{
rStr = "success:false,err:'昵称不能超过20个字符！'";
}
else
{
string UserId = "", Key = "";
SqlConnection cn = new SqlConnection(ConfigurationSettings.AppSettings["db"]);
cn.Open();
try
{
SqlCommand cm = new SqlCommand("ajaxLogin", cn);
cm.CommandType = CommandType.StoredProcedure;
cm.Parameters.Add(new SqlParameter("@UserName", SqlDbType.NVarChar, 50));
cm.Parameters["@UserName"].Value = UserName;
//==========输出参数
cm.Parameters.Add(new SqlParameter("@UserId", SqlDbType.NVarChar, 18));
cm.Parameters["@UserId"].Direction = ParameterDirection.Output;
cm.Parameters.Add(new SqlParameter("@UserKey", SqlDbType.NVarChar, 5));
cm.Parameters["@UserKey"].Direction = ParameterDirection.Output;
cm.ExecuteNonQuery();
UserId = cm.Parameters["@UserId"].Value.ToString().Trim();
Key = cm.Parameters["@UserKey"].Value.ToString().Trim();
if (UserId == "-1") rStr = @"success:false,err:'发生错误，请稍后再试！'";
else if (UserId == "0") rStr = @"success:false,err:'已经存在此用户昵称，请修改您的昵称！'";
else rStr += "success:true,UserId:'" + UserId + "',Key:'" + Key + "'";
cm.Dispose();
}
catch (Exception e)
{
rStr = @"success:false,err:'原因n" + Js(e.Message) + "'";
}
cn.Close();
}
return rStr;
}
public static string Logout()
{
HttpRequest Request = HttpContext.Current.Request;
string rStr = "", UserId = Request.Form["uid"], Key = Request.Form["key"];
if (IsNull(UserId) || IsNull(Key)) return "success:false,err:'用户信息丢失！'";
SqlConnection cn = new SqlConnection(ConfigurationSettings.AppSettings["db"]);
cn.Open();
try
{
SqlCommand cm = new SqlCommand("ajaxLogout", cn);
cm.CommandType = CommandType.StoredProcedure;
cm.Parameters.Add(new SqlParameter("@UserId", SqlDbType.NVarChar, 18));
cm.Parameters["@UserId"].Value = UserId;
cm.Parameters.Add(new SqlParameter("@UserKey", SqlDbType.NVarChar, 5));
cm.Parameters["@UserKey"].Value = Key;
cm.Parameters.Add(new SqlParameter("@Result", SqlDbType.Int));
cm.Parameters["@Result"].Direction = ParameterDirection.Output;
cm.ExecuteNonQuery();
if(cm.Parameters["@UserId"].Value.ToString().Trim()=="0")rStr = "success:false,err:'用户信息不存在！'";
else rStr="success:true";
cm.Dispose();
}
catch (Exception e)
{
}
cn.Close();
return rStr;
}
public static string Say()
{
HttpRequest Request = HttpContext.Current.Request;
string From = Request.Form["from"], To = Request.Form["to"]
, Key = Request.Form["key"], Msg = Request.Form["ct"], rStr = "";
if (IsNull(From) || IsNull(Key) || IsNull(To) || IsNull(Msg)) rStr = "success:false,err:'信息传递不完整！'";
else
{
SqlConnection cn = new SqlConnection(ConfigurationSettings.AppSettings["db"]);
cn.Open();
try
{
SqlCommand cm = new SqlCommand("ajaxSay", cn);
cm.CommandType = CommandType.StoredProcedure;
cm.Parameters.Add(new SqlParameter("@UserKey", SqlDbType.NVarChar, 5));
cm.Parameters["@UserKey"].Value = Key;
cm.Parameters.Add(new SqlParameter("@From", SqlDbType.NVarChar, 18));
cm.Parameters["@From"].Value = From;
cm.Parameters.Add(new SqlParameter("@To", SqlDbType.NVarChar, 18));
cm.Parameters["@To"].Value = To;
cm.Parameters.Add(new SqlParameter("@Msg", SqlDbType.NVarChar, 800));
cm.Parameters["@Msg"].Value = Msg;
cm.Parameters.Add(new SqlParameter("@Result", SqlDbType.Int));
cm.Parameters["@Result"].Direction = ParameterDirection.Output;
cm.ExecuteNonQuery();
if (cm.Parameters["@Result"].Value.ToString() == "0") rStr = "sucess:false,err:'发表失败！n原因：接收者已经不存在！'";
else rStr = "success:true";
cm.Dispose();
}
catch (Exception e)
{
rStr = "sucess:false,err:'发表失败！原因n" + Js(e.Message) + "'";
}
cn.Close();
}
return rStr;
}
public static string ReadUser()
{
HttpRequest Request = HttpContext.Current.Request;
string rStr = "", UserId = Request.Form["uid"];
if (IsNull(UserId)) rStr += "success:false,err:'用户id丢失！'";
else
{
SqlConnection cn = new SqlConnection(ConfigurationSettings.AppSettings["db"]);
cn.Open();
try
{
SqlCommand cm = new SqlCommand("ajaxReadUser", cn);
cm.CommandType = CommandType.StoredProcedure;
cm.Parameters.Add(new SqlParameter("@UserId", SqlDbType.NVarChar, 18));
cm.Parameters["@UserId"].Value = UserId;
string j = "";
SqlDataReader dr = cm.ExecuteReader();
while (dr.Read()) j += ",{id:'" + dr[0] + "',nn:'" + Js(dr[1].ToString()) + "'}";
dr.Close();
cm.Dispose();
rStr = "success:true,data:[" + (j == "" ? "" : j.Substring(1)) + "]";
}
catch (Exception e)
{
rStr = @"success:false,err:'发生如下错误n" + Js(e.Message) + "'";
}
cn.Close();
}
return rStr;
}
public static string Read()
{
HttpRequest Request = HttpContext.Current.Request;
string rStr = "";
string UserId = Request.Form["uid"], Key = Request.Form["key"];
if (IsNull(UserId) || IsNull(Key)) rStr = "success:false,err:'用户信息丢失！'";
else
{
SqlConnection cn = new SqlConnection(ConfigurationSettings.AppSettings["db"]);
cn.Open();
try
{
SqlCommand cm = new SqlCommand("ajaxRead", cn);
cm.CommandType = CommandType.StoredProcedure;
cm.Parameters.Add(new SqlParameter("@UserId", SqlDbType.NVarChar, 18));
cm.Parameters["@UserId"].Value = UserId;
cm.Parameters.Add(new SqlParameter("@UserKey", SqlDbType.NVarChar, 5));
cm.Parameters["@UserKey"].Value = Key;
SqlDataReader dr = cm.ExecuteReader();
string j = "";
while (dr.Read()) j += ",'" + Js(dr[0].ToString()) + "'";
dr.Close();
cm.Dispose();
rStr = "success:true,data:[" + (j == "" ? "" : j.Substring(1)) + "]";
}
catch (Exception e)
{
rStr = "success:false,err:'发生以下错误" + Js(e.Message) + "'";
}
cn.Close();
}
return rStr;
}