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我正在开发聊天应用程序。当用户点击在线用户链接时，弹出窗口（动态控件）将显示在更新面板中。但是由于计时器事件，在回发后动态创建的控件会从页面中删除。

因此，在回发事件中，我将再次使用相同的 ID 创建它们。但由于这个原因，每当我试图在用户控件中输入文本框时。页面刷新后，文本框的焦点被转移。所以我不得不一次又一次地点击 tetxbox 在里面输入一些东西。

定时器事件用于查找数据库中的当前用户是否有新消息。

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="ChatWindow.ascx.cs" Inherits="ChatWindow" %>


<div style="width: 211px;border:thick solid #ffa800"> 

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
 <ContentTemplate> 
          Hi&nbsp;&nbsp;<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>..<br />
        <asp:TextBox ID="TextBox2" runat="server" TextMode="MultiLine" Height="172px"  Width="186px"></asp:TextBox><br /><br />
            <asp:Timer ID="Timer1" runat="server" Interval="2000" ontick="Timer1_Tick" Enabled="true">   </asp:Timer>            
</ContentTemplate></asp:UpdatePanel>  </div> 
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate> 
       <asp:TextBox ID="TextBox1" runat="server" Width="148px"></asp:TextBox> 
        <asp:Button ID="BtnSend" runat="server" onclick="BtnSend_Click" Text="Send" />   </ContentTemplate>
        </asp:UpdatePanel>

更多代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Collections;

public partial class ChatWindow : System.Web.UI.UserControl
{

    int userid, toid;
    SqlConnection con = new SqlConnection("Data Source=LN-PUN-D036\\SQLEXPRESS;initial catalog=WCFChat;uid=sa;pwd=imgpoint1*");
    string windowID = "";

    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            userid = Convert.ToInt32(Session["UserId"].ToString());
            this.windowID = this.ID;
            toid =Convert.ToInt32( this.windowID.Substring(5));
            this.Label1.Text = this.ID.ToString();
        }
    }


    protected void BtnSend_Click(object sender, EventArgs e)
    {
        string temp = this.TextBox2.Text;
        var service = new ChatService.Service();

        service.sendmsg(this.TextBox1.Text, userid, toid);
        this.TextBox2.Text += "Me : " + this.TextBox1.Text + "\r\n";
    }
    protected void Timer1_Tick(object sender, EventArgs e)
    {
        con.Open();
        //   SqlCommand cmd = new SqlCommand("select Msg,Msg_Id from Message where Msg_Id=(SELECT TOP 1 Msg_Id FROM Message where Msg_To ='" + userid + "' and ReadOrNot='0' ORDER BY Msg_Id DESC) ", con);

        SqlCommand cmd = new SqlCommand("select Msg,Msg_Id,Msg_From from Message where Msg_To ='" + userid + "' and ReadOrNot='0' and Msg_From = '" + toid + "'", con);

        SqlConnection con2 = new SqlConnection("Data Source=LN-PUN-D036\\SQLEXPRESS;initial catalog=WCFChat;uid=sa;pwd=imgpoint1*");
        SqlDataReader dr = cmd.ExecuteReader();
        Hashtable hash = new Hashtable();
        string name = "";
        while (dr.Read())
        {
            hash = (Hashtable)Application["UserHash"];

            foreach (DictionaryEntry de in hash)
            {
                if (de.Key.ToString().Equals(dr[2].ToString().Trim()))
                {
                    name = de.Value.ToString();
                    break;
                }
            }

            this.TextBox2.Text += name + " :" + dr[0].ToString() + "\r\n";
            string msgid = dr[1].ToString();
            con2.Open();
            SqlCommand cmd2 = new SqlCommand("update Message set ReadOrNot='1' where Msg_Id='" + msgid + "'", con2);
            int i = cmd2.ExecuteNonQuery();
            con2.Close();
        }

        con.Close();
    }
}

 protected void craetecontrols() // this function is in main page in which i am  adding    above user control
    {
        foreach (DictionaryEntry obj in arr)
        {
            Panel p1 = new Panel();
            p1.ID = "PanelChat" + obj.Key.ToString();
            ChatWindow mycontrol = (ChatWindow)LoadControl("~/ChatWindow.ascx");
            mycontrol.ID = "ChWId" + obj.Key.ToString();
            p1.Controls.Add(mycontrol);
            p1.Style.Add("position", " absolute");
            p1.Style.Add("bottom", "0");
            p1.Style.Add("right", obj.Value.ToString());
            UpdatePanel4.ContentTemplateContainer.Controls.Add(p1);
        }
    }
4

1 回答 1

0

这更倾向于设计问题。我建议您将输入文本框排除在不同的用户控件中。这ChatWindow将仅用于显示聊天消息。因此，当它刷新时，它不会干扰输入文本框。

希望能帮助到你。

于 2013-06-10T05:56:59.593 回答