Codebhind javascript 警报“是”和“否”无法正常工作

我已经写了“是”和“否”的确认消息。 这是代码：-

 function myTestFunction() {
         if (confirm('Are you sure you want to override the file ?')) {
             return true;
         }
         else {
             return false;
         }
     }

另请参阅后面的代码：-

 if (DtMain.Rows.Count > 0)
    {
        ClientScript.RegisterStartupScript(this.GetType(), "SuccessScript", "myTestFunction()", true);
    }

现在我的问题是，当我单击“否”时，它仍然向前移动并且数据正在保存。这里出了什么问题

更新的代码

protected void btnSave_Click(object sender, EventArgs e)
{

    DataTable dtExcel = new DataTable();
    dtExcel.Clear();
    string StrCount = String.Empty;
    string connString = "";
    HttpPostedFile File = FileUpload1.PostedFile;
    string strFileType = Path.GetExtension(FileUpload1.FileName).ToLower();
    string path = FileUpload1.PostedFile.FileName;
    string Filename = path.Substring(path.LastIndexOf("\\") + 1, path.Length - path.LastIndexOf("\\") - 1);
    path = Server.MapPath(@"~/Excels/" + "/" + Filename.ToString());

    File.SaveAs(path);
    if (strFileType.Trim() == ".xls")
    {
        connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
    }
    else if (strFileType.Trim() == ".xlsx")
    {
        connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
    }
    string query = "SELECT * FROM [Sheet 1$]";
    OleDbConnection conn = new OleDbConnection(connString);
    conn.Close();
    if (conn.State == ConnectionState.Closed)
        conn.Open();
    OleDbCommand cmd = new OleDbCommand(query, conn);
    OleDbDataAdapter daExcel = new OleDbDataAdapter(cmd);

    daExcel.Fill(dtExcel);
    conn.Close();

    DataTable DtMain = CF.ExecuteDT("select Tran_type, Order_Date, Region_Mkey from WMS_Future_Del_Order_Hdr where Tran_type = '" + CmbTypeOfAsn.SelectedValue + "' and Order_Date = convert(datetime,'" + TxtEdate.Value + "',103) and Region_Mkey = '" + ddlRegion.SelectedValue + "'");

    if (DtMain.Rows.Count > 0)
    {
        ClientScript.RegisterStartupScript(this.GetType(), "SuccessScript", "myTestFunction()", true);
    }

    StringBuilder StrPubBldg = new System.Text.StringBuilder();
    XmlWriter xw = XmlWriter.Create(StrPubBldg);

    string ExcelfileName = Path.GetFileName(FileUpload1.PostedFile.FileName);

    xw.WriteStartElement("DocumentElement");
    {
        xw.WriteStartElement("WMS_Future_Del_Order_Hdr");
        xw.WriteElementString("Comp_mkey", "0");
        xw.WriteElementString("FDepartment_ID", "W");
        xw.WriteElementString("FModule_id", "W");
        xw.WriteElementString("Tran_type", CmbTypeOfAsn.SelectedValue);
        xw.WriteElementString("Doc_no", "1");
        xw.WriteElementString("Doc_date", System.DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss"));
        xw.WriteElementString("Order_Date", TxtEdate.Value);
        xw.WriteElementString("Import_Filename", Filename);
        xw.WriteElementString("Save_File_Name_Path", Server.MapPath("~/FutureDelivery/") + ExcelfileName + ".xls");
        xw.WriteElementString("Note_Remarks", txtRemarks.Text);
        xw.WriteElementString("User_id", "1");
        xw.WriteElementString("U_DateTime", System.DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss"));
        xw.WriteElementString("Delete_flag", "N");
        xw.WriteEndElement();

        string STRLine_Id = "0";
        string STRItem_Mkey = "1";
        string STRItem_Code = "2";
        string STRItem_Desc = "3";
        string STRLot_Batch_No = "4";
        string STRExp_Dt = "";
        string STRBx_Bg = "6";
        string STRNet_Wgt = "7";
        string STRQty = "8";
        string STRNo_of_Pallets = "9";
        DataTable ParaDt = CF.ExecuteDT("select * from WMS_Mapping_Para_Table");
        for (int i = 0; i < ParaDt.Rows.Count; i++)
        {
            if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Line_Id")
            {
                STRLine_Id = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Item_Mkey")
            {
                STRItem_Mkey = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Item_Code")
            {
                STRItem_Code = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Item_Desc")
            {
                STRItem_Desc = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Lot_Batch_No")
            {
                STRLot_Batch_No = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Exp_Dt")
            {
                STRExp_Dt = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Qty")
            {
                STRQty = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Bx_Bg")
            {
                STRBx_Bg = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }
            else if (ParaDt.Rows[i]["Txn_Column_Name"].ToString() == "Net_Wgt")
            {
                STRNet_Wgt = ParaDt.Rows[i]["Sheet_Int_Id"].ToString();
            }

        }
        if (dtExcel.Rows.Count > 0)
        {
            for (int i = 0; i < dtExcel.Rows.Count; i++)
            {
                xw.WriteStartElement("WMS_Future_Del_Order_Trl");
                xw.WriteElementString("Sr_No", (i + 1).ToString());
                xw.WriteElementString("Line_Id", dtExcel.Rows[i][Convert.ToInt32(STRLine_Id)].ToString());
                xw.WriteElementString("Item_Mkey", dtExcel.Rows[i][Convert.ToInt32(STRItem_Mkey)].ToString());
                xw.WriteElementString("Item_Code", dtExcel.Rows[i][Convert.ToInt32(STRItem_Code)].ToString());
                xw.WriteElementString("Item_Desc", dtExcel.Rows[i][Convert.ToInt32(STRItem_Desc)].ToString());
                xw.WriteElementString("Lot_Batch_No", dtExcel.Rows[i][Convert.ToInt32(STRLot_Batch_No)].ToString());
                xw.WriteElementString("Exp_Dt", Convert.ToDateTime(dtExcel.Rows[i][Convert.ToInt32(STRExp_Dt)].ToString()).ToShortDateString());
                xw.WriteElementString("Qty", dtExcel.Rows[i][Convert.ToInt32(STRQty)].ToString());
                xw.WriteElementString("Bx_Bg", dtExcel.Rows[i][Convert.ToInt32(STRBx_Bg)].ToString());
                xw.WriteElementString("Net_Wgt", dtExcel.Rows[i][Convert.ToInt32(STRNet_Wgt)].ToString());
                xw.WriteElementString("No_of_Pallets", dtExcel.Rows[i][Convert.ToInt32(STRNo_of_Pallets)].ToString());
                xw.WriteElementString("Creation_Date", System.DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss"));
                xw.WriteElementString("Update_Date", System.DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss"));
                xw.WriteElementString("Created_By", "1");
                xw.WriteElementString("Updated_By", "1");
                xw.WriteElementString("User_id", "1");
                xw.WriteElementString("U_DateTime", System.DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss"));
                xw.WriteEndElement();
            }
        }
        xw.Close();
        String strretmkey = InsertUpdateDelete.InsertUpdateDeleteCls.InsertUpdateDelete_sql(Hid_Mode.Value, Convert.ToInt32(Hid_MKey.Value), "WMS_Future_Del_Order_Hdr", "MKEY", "FD", StrPubBldg.ToString());
        DataTable dt = CF.ExecuteDT("Select Tran_type,DATEPART(yyyy,U_DateTime) AS U_DateTime,DATEPART(mm,U_DateTime) AS U_DateTime from WMS_Future_Del_Order_Hdr where mkey ='" + strretmkey + "'");
        StrDocNo = strretmkey + '/' + dt.Rows[0][0].ToString() + '/' + dt.Rows[0][2].ToString() + dt.Rows[0][1].ToString();

        ExcelfileName = StrDocNo.ToString().Replace("/", "_");
        string strPathval = Server.MapPath("~/FutureDelivery/") + ExcelfileName + ".xls";
        FileUpload1.PostedFile.SaveAs(Server.MapPath("~/FutureDelivery/") + ExcelfileName + ".xls");

        CF.ExecuteQuerry("update WMS_Future_Del_Order_Hdr set Doc_no ='" + StrDocNo + "', Save_File_Name_Path ='" + strPathval + "' where mkey=" + strretmkey + "");

        lblDocNo.Text = StrDocNo.ToString();
        Hid_MKey.Value = strretmkey;
    }

    ClientScript.RegisterStartupScript(this.GetType(), "SuccessScript", "alert('Record saved successfully.');", true);
    FunGridBind();

    btnSave.Enabled = false;
}

因为您不能以这种方式将服务器端代码执行与客户端代码混合。因此根据讨论，这可以使用以下两种方法来实现。

方法 1：使用复选框

在您的 aspx/前端放置一个复选框，如下所示

<asp:CheckBox ID="chkOverwriteFile" runat="server" Text="Overwrite existing file" />

然后在你的代码后面使用它btnSave.Click事件如下

protected void btnSave_Click(object sender, EventArgs e)
{
    //////////////////// YOUR OTHER CODE

    DataTable DtMain = CF.ExecuteDT("select Tran_type, Order_Date, Region_Mkey from WMS_Future_Del_Order_Hdr where Tran_type = '" + CmbTypeOfAsn.SelectedValue + "' and Order_Date = convert(datetime,'" + TxtEdate.Value + "',103) and Region_Mkey = '" + ddlRegion.SelectedValue + "'");

    bool blWriteReecord = false;
    if (DtMain.Rows.Count > 0)
    {
        if (chkOverwriteFile.Checked) {
            blWriteReecord = true;
        }
        else
        {
            ClientScript.RegisterStartupScript(this.GetType(), "SuccessScript", "alert('Record already exitst. If you want to overwrite it then select Overwrite existing file and then save again.');", true);
        }
    }
    else
    {
        blWriteReecord = true;
    }

    if (blWriteReecord) {
        StringBuilder StrPubBldg = new System.Text.StringBuilder();

        ///////////////// YOUR OTHER CODE

        FunGridBind();

        btnSave.Enabled = false;
    }
}

该代码块将检查已存在的文件/记录。如果存在，它将要求用户选择复选框以覆盖记录。

然后用户选择该复选框并再次提交。它只是是/否确认消息框作为选择或不选择复选框的替代方案。

此外，如果您想扩展它，那么您可以最初隐藏该复选框并仅在记录存在时才显示。

方法 2：使用隐藏的 div

在此方法中，您可以按照以下步骤操作：

1. 连同你的FileUpload and btnSave您在前端包含一个隐藏的消息 div，其设计类似于包含您的消息的 MessageBox 和两个按钮Yes（btn是的，如果您想使用 AJAX，则可以在服务器端调用后面的代码或在客户端）和No。 （此消息 div 可以基于 CSS/JavaScript 或根据您的方便或框架）
2. On your btnSave.Click您检查您的文件/记录，如果不存在，通常会保存它。如果它确实已经存在，那么您可以从代码隐藏中调用隐藏的 div，提示是否覆盖。
3. 如果用户选择No只是隐藏消息 div 并且什么也不做。
4. 如果用户选择Yes调用与中相同的代码btnSave.Click但不提示用户输入现有文件/记录，只是覆盖它。
5. 为了避免重复，代码可以重新组织成子部分，即可以从两者调用的函数/子部分btnSave.Click也Yes消息div的按钮，带有附加参数，决定是否覆盖文件或显示消息div。