asp.net - trigger - update panel asp net dropdownlist

DropDownList SelectedIndexChanged dentro de Gridview no se activa!

Question

He estado buscando una solución para esto por un tiempo y he visto muchas publicaciones que me muestran cómo hacerlo pero aún no puedo hacer que mi evento SelectedIndexChanged se active cuando se cambia DropDownList.

DropDownList AutoPostBack está establecido en True, también he seguido el código en la siguiente publicación: Enlace a la publicación

Aquí está mi código:

.ASPX

 <asp:GridView ID="gvCases" DataKeyNames="UserId" runat="server" AutoGenerateColumns="False"
BorderWidth="0px" CssClass="gridList" GridLines="None">
<AlternatingRowStyle BackColor="#F7F7F7" />
<Columns>
<asp:BoundField DataField="id" HeaderText="Case Ref" />
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="clientName" runat="server" Text="Label"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="company" HeaderText="Company" />
<asp:TemplateField HeaderText="Order Date">
<ItemTemplate>
<asp:Label ID="dateTime" runat="server" Text="Label"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Case Owner">
<ItemTemplate>
<asp:DropDownList ID="iconUsers" runat="server" OnSelectedIndexChanged="iconUsers_SelectedIndexChanged">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:Button ID="btnDetails" runat="server" CausesValidation="False" Text="Details" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:Button ID="btnSchedule" runat="server" CausesValidation="False" Text="Schedule" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

.VB

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If (Request.IsAuthenticated = False) Then
Response.Redirect("~/admin/default.aspx")
End If
Dim keypadSQL As SqlConnection = New SqlConnection()
keypadSQL.ConnectionString = ConfigurationManager.ConnectionStrings("connKeypad").ConnectionString()
Dim cmdActive As SqlCommand = New SqlCommand()
cmdActive.Connection = keypadSQL
cmdActive.CommandText = "spCasesActive"
cmdActive.CommandType = CommandType.StoredProcedure
Dim daCases As SqlDataAdapter = New SqlDataAdapter
daCases.SelectCommand = cmdActive
Dim dsCases As DataSet = New DataSet()
daCases.Fill(dsCases, "CaseList")
Dim CaseTotal As Integer
CaseTotal = dsCases.Tables(0).Rows.Count
If CaseTotal = 1 Then
iCaseTotal.InnerHtml = CaseTotal & " Case"
Else
iCaseTotal.InnerHtml = CaseTotal & " Cases"
End If
gvCases.DataSource = dsCases
gvCases.DataBind()
cmdActive.Dispose()
If Page.IsPostBack Then
End If
End Sub
Protected Sub gvCases_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvCases.RowDataBound
If e.Row.RowType = DataControlRowType.Header Then
gvCases.Columns(5).ItemStyle.Width() = "60"
gvCases.Columns(6).ItemStyle.Width() = "70"
End If
If e.Row.RowType = DataControlRowType.DataRow Then
Dim rowView As DataRowView = CType(e.Row.DataItem, DataRowView)
Dim strClientName As String
Dim clientName As Label
strClientName = rowView("firstname") & " " & rowView("lastname")
clientName = CType(e.Row.FindControl("clientName"), Label)
clientName.Text = strClientName
Dim strDateTime As String
Dim dateTime As Label
strDateTime = rowView("CaseSent")
dateTime = CType(e.Row.FindControl("dateTime"), Label)
dateTime.Text = FormatDateTime(strDateTime, DateFormat.ShortDate) & "<br />" & FormatDateTime(strDateTime, DateFormat.ShortTime)
gvCases.Columns(3).ItemStyle.Font.Size = 8
gvCases.Columns(5).ControlStyle.CssClass = "btnEdit"
gvCases.Columns(6).ControlStyle.CssClass = "btnSchedule"
Dim intUserId As String
intUserId = Convert.ToString(gvCases.DataKeys(e.Row.RowIndex).Value)
Dim cmd As New SqlCommand("SELECT id, Firstname, Lastname, Firstname + '' '' + Lastname As FullName FROM [users_icon] ORDER BY Firstname, Lastname", New SqlConnection(ConfigurationManager.ConnectionStrings("connKeypad").ConnectionString()))
cmd.Connection.Open()
Dim ddlValues As SqlDataReader
ddlValues = cmd.ExecuteReader()
Dim iconUsers As DropDownList
iconUsers = CType(e.Row.FindControl("iconUsers"), DropDownList)
iconUsers.Style.Add("font-size", "11px")
iconUsers.DataSource = ddlValues
iconUsers.DataValueField = "id"
iconUsers.DataTextField = "FullName"
iconUsers.DataBind()
Dim ListItem1 = New ListItem("Select Case Owner", "0")
iconUsers.Items.Insert("0", ListItem1)
iconUsers.AutoPostBack = True
If IsDBNull(rowView("CaseOwner")) Then
iconUsers.SelectedValue = 0
Else
iconUsers.SelectedValue = rowView("CaseOwner")
End If
AddHandler iconUsers.SelectedIndexChanged, AddressOf iconUsers_SelectedIndexChanged
cmd.Connection.Close()
cmd.Connection.Dispose()
Dim btnDetails As Button = CType(e.Row.FindControl("btnDetails"), Button)
btnDetails.PostBackUrl = "~/admin/detail.aspx?uid=" & intUserId
Dim LabelAddress As Button = CType(e.Row.FindControl("btnSchedule"), Button)
LabelAddress.PostBackUrl = "~/admin/schedule.aspx?uid=" & intUserId
End If
End Sub
Protected Sub iconUsers_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
Response.Write("Function Called")
End Sub

Gracias por cualquier ayuda. J.

Answer 1

Usted dice que AutoPostBack está establecido en true pero no lo veo en el marcado y de manera predeterminada está configurado en falso. Entonces intenta

<asp:DropDownList ID="iconUsers" runat="server" OnSelectedIndexChanged="iconUsers_SelectedIndexChanged" AutoPostBack="true">
</asp:DropDownList>

Answer 2

Hay algunas preguntas similares (consulte Controlador de eventos que no se activa con AddHandler y Asignar un evento a un control personalizado dentro de un control Repeater ), pero su caso particular parece que está agregando el controlador dos veces; una vez en el marcado, y una vez en databound.

Me gustaría eliminar el que está en el evento RowDataBound (ya que no está haciendo nada, porque el controlador se perderá cuando se publique de nuevo, y el controlador se agrega después de que el evento realmente se dispara). Además, asegúrese de que AutoPostBack como @Bala menciona.