导航回到上一页asp.net后得到警报 [英] getting alert after navigating back to to previous page asp.net

问题描述

大家好，

我写了两个文本框的比较验证，第一次我输入错误，我将收到警告信息，第二次我使用浏览器后退按钮导航回上一页，输入有效输入并导航到下一页我再次收到该警报消息?但我不希望发生这种情况，该怎么办

Hi All,

i have written compare validation for two textboxes,first time i give wrong inputs and i will get alert message which i have given,second time i will give valid inputs and navigate to next page,when i navigate back to previous page using browser back button i once again get that alert message?but i dont want that to happen,How to do that

<asp:CompareValidator ID="CompareValidator1" ControlToValidate="txtFromDate"
               ControlToCompare="txtToDate" Display="Dynamic" runat="server"
               ErrorMessage="To Date should be Greater than From Date" Operator="LessThan"
               Type="Date" Font-Size="Small" >

这是比较验证

this is compare validation

protected void btnOk_Click(object sender, EventArgs e)
       {
               if (Validate()) //this method makes sure the textboxes are not empty
               {
                   string Data = combo.SelectedItem.Text;
                   string FromDate = txtFromDate.Text;
                   string ToDate = txtToDate.Text;
                   if (ValidateNoOfDays(Data, FromDate, ToDate))
                   {
                       try
                       {
                           Session["Data"] =Data;
                           Session["FromDate"] = FromDate;
                           Session["ToDate"] = ToDate;

                           Response.Redirect("Show.aspx");
                       }
                       catch (Exception ex)
                       {
                           Response.Write(ex.Message);
                       }
                   }
               }
           }

private bool ValidateNoOfDays(string data, string FromDate, string ToDate)
       {
           bool Valid = true;
           try
           {
               string myStringVariable = "";
               DateTime F_Date = Convert.ToDateTime(FromDate);
               DateTime T_Date = Convert.ToDateTime(ToDate);
               switch (data)
               {
                   case "Week":
                       TimeSpan _WeekT = T_Date.Subtract(F_Date);
                       if ((_WeekT.Days) > 7)
                       {
                           Valid = false;
                           myStringVariable = "Week Cannot have more than 7 days";
                           ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + myStringVariable + "');", true);

                       }
                       break;

                   case "Month":
                       TimeSpan _MonthT = T_Date.Subtract(F_Date);
                       if ((_MonthT.Days) > 30)
                       {
                           Valid = false;
                           myStringVariable = "Month Cannot have more than 30 days";
                           ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + myStringVariable + "');", true);
                       }
                       break;


                   case "Year":
                       TimeSpan _YearT = T_Date.Subtract(F_Date);
                       if ((_YearT.Days) > 365)
                       {
                           Valid = false;
                           myStringVariable = "year Cannot have more than 365 days";
                           ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + myStringVariable + "');", true);
                       }
                       break;
               }
           }
           catch (Exception ex)
           {

           }
           return Valid;
       }

推荐答案

单击后退按钮时，在其按钮单击事件中，清除两个文本框的文本...--

TextBox1.Text =";
TextBox2.Text =";

when you click back button, in its button click event, clear text of both textboxes...like -

TextBox1.Text = "";
TextBox2.Text = "";

which textbox you are validating first? I assume you set ControlToValidate = 2nd textbox..

Here is the code i tried and working fyn..
On First.aspx --
 <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:CompareValidator ID="CompareValidator1" ControlToValidate="TextBox2" ControlToCompare="TextBox1" Operator="Equal" runat="server" ErrorMessage="No Match!"></asp:CompareValidator>
        <br />
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

On button_Click event, it redirects to Second.aspx page... now from here when i click browser's back arrow..it doesn't shown me alert message...

Try out this!

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