Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

> ASP > ASPxperience > Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

Last post 2/25/2011 8:32 AM by Adrian Bordones. 6 replies.

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Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

6/14/2008 3:25 PM

Joined on 3/20/2008
Posts 6

Hi guys,

I was wondering if it’s possible to load via a callback in ASPxPopupControl a usercontrols, which consist of some html and a callback.

Now I get the error:
eThe target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler
(Error from Firebug of Firefox)

My code is based of this example: http://demos.devexpress.com/Tutorials/SourceViewer.aspx?tutorial=ASPxperience/PopupControl/HowToLoadUserControlViaCallback/HowToLoadUserControlViaCallback

I edit only the UserControl1.ascx to:

And in the code behind I added this:
        protected void ASPxCallback1_Callback(object source, DevExpress.Web.ASPxCallback.CallbackEventArgs e)
        {
            ASPxLabel1.Text = "Callback works!";
        }

I hope there is a way to do this.

Thanks,
Thieme

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Filed under: ASPxPopupControl, ASPxCallback

Roma R (DevExpress)

Re: Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

6/16/2008 5:03 AM

Joined on 5/4/2007
Posts 486

Answer

Hello

The ASPxCallback component doesn't update any area in the html representation of a page, but has a client CallbackComplete event.
If you want to use the ASPxCallback you need to modify your code in the following manner.

UserControl ASPX code:

<table cellpadding="0" cellspacing="0" style="width: 100%;">
    <tr>
        <td>
            <dxe:ASPxLabel ID="ASPxLabel1" runat="server" Text="UserControl 1 has been loaded successfully"
                ClientInstanceName="lbl">
            </dxe:ASPxLabel>
        </td>
    </tr>
    <tr>
        <td style="padding-top: 10px; height: 54px;" align="center">
            <dxe:ASPxButton ID="okButton1" runat="server" Text="Ok" AutoPostBack="false">
                <ClientSideEvents Click="function(s, e) { callback1.SendCallback(); } " />
            </dxe:ASPxButton>
        </td>
    </tr>
</table>
<dxcb:ASPxCallback ID="ASPxCallback1" runat="server" OnCallback="ASPxCallback1_Callback"
    ClientInstanceName="callback1">
    <ClientSideEvents CallbackComplete="function(s, e) {
    lbl.SetText(e.result);
}" />
</dxcb:ASPxCallback>

UserControl C# code:

protected void ASPxCallback1_Callback(object source, DevExpress.Web.ASPxCallback.CallbackEventArgs e) {
    e.Result = "Callback works!";
}

Page C# code:

    protected void Page_Load(object sender, EventArgs e) {
        if(Session["UC_Loaded"] != null && Request.Params["__CALLBACKID"] != "clbCallback") {
            Control resControl = Page.LoadControl(string.Format(UserControlPathTemplate, Session["UC_Loaded"]));
            if(resControl != null)
                pcPopup.Controls.Add(resControl);
        }
    }
    protected void OnCallback(object source, DevExpress.Web.ASPxCallback.CallbackEventArgs e) {
        Control resControl = null;
        if(!string.IsNullOrEmpty(e.Parameter)) {
            resControl = Page.LoadControl(string.Format(UserControlPathTemplate, e.Parameter));
            Session["UC_Loaded"] = e.Parameter;
        }
        if(resControl != null) {
            pcPopup.Controls.Add(resControl);
            e.Result = ASPxCallback.GetRenderResult(resControl);
        }
    }

Page JS code:

        function ShowPopup(userControlID) {
            popup.SetHeaderText("UserCotnrol " + userControlID);
            popup.SetContentHTML("Loading...");
            popup.Show();
 
            // We cannot use cache in this case          
            callback.SendCallback(userControlID);
        }

But I would recommend that you use our ASPxCallbackPanel control for this purpose.

UserControl ASPX code:

<table cellpadding="0" cellspacing="0" style="width: 100%;">
    <tr>
        <td>
            <dxcp:ASPxCallbackPanel ID="ASPxCallbackPanel1" runat="server" ClientInstanceName="cbp"
                Width="200px" OnCallback="ASPxCallbackPanel1_Callback">
                <PanelCollection>
                    <dxp:PanelContent runat="server">
                        <dxe:ASPxLabel ID="ASPxLabel1" runat="server" Text="UserControl 1 has been loaded successfully"
                            ClientInstanceName="lbl">
                        </dxe:ASPxLabel>
                    </dxp:PanelContent>
                </PanelCollection>
            </dxcp:ASPxCallbackPanel>
        </td>
    </tr>
    <tr>
        <td style="padding-top: 10px; height: 54px;" align="center">
            <dxe:ASPxButton ID="okButton1" runat="server" Text="Ok" AutoPostBack="false">
                <ClientSideEvents Click="function(s, e) { cbp.PerformCallback(); } " />
            </dxe:ASPxButton>
        </td>
    </tr>
</table>

UserControl C# code:

protected void ASPxCallbackPanel1_Callback(object source, DevExpress.Web.ASPxClasses.CallbackEventArgsBase e) {
    ASPxLabel1.Text = "Callback works!";
}

Page C# code:

    protected void Page_Load(object sender, EventArgs e) {
        if(Session["UC_Loaded"] != null && Request.Params["__CALLBACKID"] != "clbCallback") {
            Control resControl = Page.LoadControl(string.Format(UserControlPathTemplate, Session["Loaded"]));
            if(resControl != null)
                pcPopup.Controls.Add(resControl);
        }
    }
    protected void OnCallback(object source, DevExpress.Web.ASPxCallback.CallbackEventArgs e) {
        Control resControl = null;
        if(!string.IsNullOrEmpty(e.Parameter)) {
            resControl = Page.LoadControl(string.Format(UserControlPathTemplate, e.Parameter));
            Session["UC_Loaded"] = e.Parameter;
        }
        if(resControl != null) {
            pcPopup.Controls.Add(resControl);
            e.Result = ASPxCallback.GetRenderResult(resControl);
        }
    }

Page JS code:

        function ShowPopup(userControlID) {
            popup.SetHeaderText("UserCotnrol " + userControlID);
            popup.SetContentHTML("Loading...");
            popup.Show();
 
            // We cannot use cache in this case          
            callback.SendCallback(userControlID);
        }

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Thanks, Roman
R&D, .Net Team, DevExpress

PS. If you wish to receive direct assistance from our Support Team, use Support Center.

Thieme

Re: Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

6/16/2008 3:31 PM

Joined on 3/20/2008
Posts 6

Thank you very much for the quick en good post. The problem is now solved!

For the people who want to copy this upper code. There is a little wrong code, in this section:

Roman R (Developer Express):

    protected void Page_Load(object sender, EventArgs e) {

        if(Session["UC_Loaded"] != null && Request.Params["__CALLBACKID"] != "clbCallback") {

            Control resControl = Page.LoadControl(string.Format(UserControlPathTemplate, Session["Loaded"]));

            if(resControl != null)

                pcPopup.Controls.Add(resControl);

        }

    }

Replace: Session["Loaded"] with Session["UC_Loaded"]

Thanks!

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Roma R (DevExpress)

Re: Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

6/17/2008 3:00 AM

Joined on 5/4/2007
Posts 486

Thank you. It's my mistake.

Reply In reply to Contact

Thanks, Roman
R&D, .Net Team, DevExpress

PS. If you wish to receive direct assistance from our Support Team, use Support Center.

Adrian Bordones

Re: Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

4/23/2010 7:04 PM

Joined on 3/20/2009
Panama City
Posts 4

Hi Roman!!!! Greetings from Panama City!!! Panama Canal & Ships & Cargo Ships!!!! jejeje!

I work with DevExpress Controls, and I was reading your last post... and that

kind of error: "The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler"

I solved it, locating my controls programmatically in the "Page_Init" event, and everything works too!

had you tested that method before?

Excuseme my English!!! It's not so good as yours, but I am working hardly to learn fluently.

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Adrian E. Bordones B.
Microsoft Freelance Web Developer

faroca

Re: Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

2/25/2011 5:04 AM

Joined on 10/7/2010
Posts 3

Supongo que hablas en español debido a tu ingles, jejeje.

Me gustaría ver como lo solucionaste si puede ser porque estoy teniendo el mismo problema y me lleva loco.

Gracias de antemano.

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Adrian Bordones

Re: Error: The target 'ASPxCallback1' for the callback could not be found or did not implement ICallbackEventHandler

2/25/2011 8:32 AM

Joined on 3/20/2009
Panama City
Posts 4

Saludos hermano! A ver dime como te puedo ayudar? Smile Si puedes enviar algo de código, con mucho gusto brother! aebordones@hotmail.com

Reply In reply to Contact

Adrian E. Bordones B.
Microsoft Freelance Web Developer

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