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Update panel error: control with identifier "xxx" was not found in UpdatePanel

I have a composite user quote control down, which consists of a text field and a calendar, as well as a validation control. I set a property called "TextBox" in the usercontrol that returns a link to the text field used in the control. This is a text field in which the user enters a date.

On an ASPX page, I have an instance of this usercontrol:

   <uc1:DropDownCalendar ID="dtmDateFirstEntry" runat="server"  Required="True" />

In my code behind, I want to determine when the user has a tab from a text field and, using the UpdatePanel, abstracts the corresponding message depending on the specified date.

Elsewhere in the ASPX page, I have the following:

   <asp:UpdatePanel ID="upIntendedStay" runat="server">
    <ContentTemplate>
        <asp:Label ID="Label4" runat="server" Text="Update this text from server" CssClass="ErrorText"></asp:Label>
    </ContentTemplate>
    </asp:UpdatePanel>

Here is what I am doing in the code behind:

If Not Me.IsPostBack Then

    dtmDateFirstEntry.TextBox.AutoPostBack = True
    Dim trigger As New AsyncPostBackTrigger
    trigger.ControlID = dtmDateFirstEntry.TextBox.ClientID
    trigger.EventName = "onChange"
    upIntendedStay.Triggers.Add(trigger)

End If

, , - :

<input id="ctl00_phPageContent_dtmDateFirstEntry_txtDate" class="DefaultTextBox" name="ctl00$phPageContent$dtmDateFirstEntry$txtDate" onchange="javascript:setTimeout('__doPostBack(\'ctl00$phPageContent$dtmDateFirstEntry$txtDate\',\'\')', 0)" onkeypress="if (WebForm_TextBoxKeyHandler(event) == false) return false;" style="width: 112px;" type="text" value="Mar-29-2010" />
<input id="ctl00_phPageContent_dtmDateFirstEntry_imgDate" name="ctl00$phPageContent$dtmDateFirstEntry$imgDate" src="images/calendar.JPG" style="border-width: 0px;" type="image" />&nbsp;

, :

A control with ID 'ctl00_phPageContent_dtmDateFirstEntry_txtDate' could not be found for the trigger in UpdatePanel 'upIntendedStay'.

, UpdatePanel. , .

, usercontrol . , , , , UpdatePanel.

, Textbox, textbox1 :

 <asp:UpdatePanel ID="upIntendedStay" runat="server">
    <ContentTemplate>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Label ID="Label4" runat="server" Text="Update tHis text from server" CssClass="ErrorText"></asp:Label>
    </ContentTemplate>
    </asp:UpdatePanel>

:

'onchange' 'TextBox1' UpdatePanel 'upIntendedStay'.

, TEXTBOX1 UpdatePanel, "ClientId" "ID" "OnChange" "TextChanged", . , UpdatePanel.

? .

Dim trigger As New AsyncPostBackTrigger
'trigger.ControlID = dtmDateFirstEntry.TextBox.ID '<<<<<<<<<<<<<<<<<<<<<
trigger.ControlID = TextBox1.ID
trigger.EventName = "TextChanged"
upIntendedStay.Triggers.Add(trigger)

.. "", :

'txtDate' UpdatePanel 'upIntendedStay'.

. -, , , , , usercontrol!

+5
5

, , User Control dtmDateFirstEntry. , . , .

<asp:UpdatePanel ID="upIntendedStay" runat="server" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="dtmDateFirstEntry" EventName="DateChanged" />
    </Triggers>
    <ContentTemplate>
        <asp:Label ID="Label4" runat="server" Text="Update tHis text from server" CssClass="ErrorText"></asp:Label>
    </ContentTemplate>
</asp:UpdatePanel>

DateChanged , dtmDateFirstEntry. , ?

+4

:

...
trigger.ControlID = dtmDateFirstEntry.TextBox.ID
trigger.EventName = "TextChanged"
...

ClientID ControlID "On" EventName.

+2

ASPX:

<asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    <asp:UpdatePanel ID="upIntendedStay" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
             <uc1:DropDownCalendar ID="DropDownCalendar1" runat="server" />
            <asp:Label ID="Label4" runat="server" Text="Update tHis text from server" CssClass="ErrorText"></asp:Label>

        </ContentTemplate>
    </asp:UpdatePanel>
</asp:Content>

:

If Not Page.IsPostBack Then

    Dim trigger As New AsyncPostBackTrigger
    TextBox3.AutoPostBack = True
    trigger.ControlID = TextBox3.ID
    trigger.EventName = ""
    upIntendedStay.Triggers.Add(trigger)

    Dim trigger2 As New AsyncPostBackTrigger
    DropDownCalendar1.TextBox.AutoPostBack = True
    trigger2.ControlID = DropDownCalendar1.ID
    trigger2.EventName = "DateChanged"
    upIntendedStay.Triggers.Add(trigger2)

End If

Label4.Text = Now.ToString

:

DateChanged ( ByVal , ByVal e As System.EventArgs)

.. !

+2

Page_Load, . Page_Init.

+1

runt html , :

using System.Web.UI.HtmlControls;

HtmlControl x = (HtmlControl)this.MyUpdatePanel.FindControl("MyHtmlControl");
0
source

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