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。
谁能解决这个问题，100分归他，其他100分当作散分。
- JScript code
if(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# code
using 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; }}