更新小窗口塊阻止執行一些錯誤消息

Question

如果您點擊第一個按鈕，第一個面板出現，第二個面板出現隱藏，如果您點擊第二個按鈕，則顯示一個帶有2個面板的1個更新面板的2頁面控制的asp頁面第二個面板發生了事情。它工作正常，沒有問題。

問題出現在第二個面板中，我有另一個負責打印錯誤消息的更新面板。只檢查輸入長度的消息正常，但涉及查詢數據庫以檢查id有效性的消息未被打印。

我認爲查詢是問題，我試過他們在一個沒有更新面板的分離頁面，他們工作正常。問題在更新面板的某個地方。我真的不明白在哪裏。如果你能幫助我，我將不勝感激。

這是前端代碼（我忽略了一些不起眼的細節）：

<asp:Button ID="Button1" runat="server" Text="[Input your Id?]" /> 
<asp:Button ID="Button2" runat="server" Text="[Aditional info]" /> 
    ..... 
<asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
    <ContentTemplate> 
< asp:Panel ID="Panel1" runat="server"> 
some code here 

</asp:Panel> 

<asp:Panel ID="Panel2" runat="server"> 

<b>*ID Number:&nbsp;&nbsp;</b> 
<asp:TextBox ID="IdNo" runat="server" ></asp:TextBox><font size='2'> 
    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" class="errorMess" ErrorMessage="Letters are not Allowed!!" ControlToValidate="IdNumb" ValidationExpression="\d+" 
    runat="server" /> 
    <asp:UpdatePanel ID="UpdatePanel3" runat="server"> 
    <ContentTemplate> 
    <asp:Label ID="errorEm" class="errorMess" runat="server" Text="Please fill in the required fields"></asp:Label> 
    <asp:Label ID="errorLenght" class="errorMess" runat="server" Text="Id is too long!!!"></asp:Label> 
    <asp:Label ID="errorUser" class="errorMess" runat="server" Text="Id is not valid!!!"></asp:Label> 
    </ContentTemplate> 
    <Triggers> 
    <asp:AsyncPostBackTrigger ControlID="Button5" EventName="Click" /> 
    </Triggers> 
    </asp:UpdatePanel> 
    <asp:Button ID="Button5" runat="server" Text="Generate" /></td></tr> 

    </asp:Panel> 
    </ContentTemplate> 
    <Triggers> 
    <asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /> 
    </Triggers> 
    </asp:UpdatePanel> 

，這是後端VB代碼：

Protected Sub Button5_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button5.Click 
If IdNo.Text = "" Then 
    Panel1.Visible = False 
    Panel2.Visible = True 
    errorEm.Visible = True 
ElseIf IdNo.Text.Length > 9 Then 
    Panel1.Visible = False 
    Panel2.Visible = True 
    errorLenght.Visible = True 
Else 

    Try 'everything that comes here does not work' 
     myconn.Open() 
     Dim stquery As String = "SELECT * from account WHERE user_id= @id" 
     Dim smd = New MySqlCommand(stquery, myconn) 
     smd.Parameters.AddWithValue("@id", Convert.ToInt32(IdNo.Text)) 
     Dim myreader = smd.ExecuteReader() 
     If Not myreader.HasRows Then 
      Panel1.Visible = False 
      Panel2.Visible = True 
      errorUser.Visible = True 
      myconn.Close() 
      Return 
     Else 

      Panel1.Visible = False 
      Panel2.Visible = True 
      myreader.Read() 
      Dim ErrorMessage As String = "alert('User has been found');" 
      Page.ClientScript.RegisterStartupScript(Me.GetType(), "ErrorAlert", ErrorMessage, True) 


      myconn.Close() 
     End If 
     myconn.Close() 
    Catch ex As Exception 
     Dim ErrorMessage As String = "alert('" & ex.Message.ToString() & "');" 
     Page.ClientScript.RegisterStartupScript(Me.GetType(), "ErrorAlert", ErrorMessage, True) 
     myconn.Close() 
    End Try 
End If 
End Sub 

Answer 1

當你想從更新面板的內部執行腳本 - 不要使用

Page.ClientScript.RegisterStartupScript 

使用

ClientScriptManager.RegisterStartupScript 

改爲。

編號：http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerstartupscript.aspx