CODEWITHSUNDEEP
asp.netvb.netuser-controlsevent-handling
Dooie
Dooie

Reputation: 1669

Handling events of usercontrols within listview

I have a simple usercontrol which raises an event on button click

Public Class UcPaymentCheque
    Inherits System.Web.UI.UserControl

    Public Event OnCancelClick()

    Private Sub btnCancelPayment_Click(sender As Object, e As System.EventArgs) Handles btnCancelPayment.Click
        RaiseEvent OnCancelClick()
    End Sub
End Class

This usercontrol is used within a listview 

<asp:ListView ID="lvwNonTpProducts" runat="server" ItemPlaceholderID="ItemPlaceholder">
    <LayoutTemplate>
        <asp:PlaceHolder ID="ItemPlaceholder" runat="server" />
    </LayoutTemplate>
    <ItemTemplate>
        <TPCustomControl:UcPaymentCheque ID="UcTPPaymentCheque" runat="server" Visible="false" />
    </ItemTemplate>
</asp:ListView>

which is databound on page load

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Page.IsPostBack Then

    Else
        BuildPage()
    End If
End Sub

At what point should add the handler? I have fiddled with the ondatabound event like so;

Private Sub lvwNonTpProducts_ItemDataBound(sender As Object, e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles lvwNonTpProducts.ItemDataBound
    Dim UcTPPaymentCheque = DirectCast(e.Item.FindControl("UcTPPaymentCheque"), UcPaymentCheque)
    AddHandler UcTPPaymentCheque.OnCancelClick, AddressOf OnCancelClick
End Sub

but this does not work and am guess at a databound issue???

Upvotes: 1

Views: 1115

Answers (2)

jason
jason

Reputation: 3615

You can check out my response to a similar question here: creating and listening for events

Essentially, you want a user control to raise its own event, like this:

Partial Class myControl
    Inherits System.Web.UI.UserControl
    Public Event MyEvent As EventHandler

    'your button click event
    Protected Sub bnt_click(ByVal sender As Object, ByVal e As EventArgs)
      'do stuff
      'now raise the event
       RaiseEvent MyEvent (Me, New EventArgs)
    end sub
end class

In this example, I raise the event when the user clicks a button within the user control. You can easily raise the event anywhere, such as when the control loads, using a timer, whatever.

Then, in the main page, you want to and an event handler to the user control, like this:

<mc:myControlrunat="server" ID="myControl1" OnMyEvent="myControl_MyEvent"  />

Now, in the code behind, you can add the event, like this:

Protected Sub myControl_MyEvent(ByVal sender As Object, ByVal e As EventArgs)
 'do stuff 
end sub

Upvotes: 1

Irene
Irene

Reputation: 5

You can add the handler in the declaration of the user control in the listview, using OnCancelClick, as follows:

<asp:ListView ID="lvwNonTpProducts" runat="server" ItemPlaceholderID="ItemPlaceholder">
    <LayoutTemplate>
        <asp:PlaceHolder ID="ItemPlaceholder" runat="server" />
    </LayoutTemplate>
    <ItemTemplate>
        <TPCustomControl:UcPaymentCheque ID="UcTPPaymentCheque" runat="server" Visible="false" OnCancelClick="UcTPPaymentCheque_OnCancelClick" />
    </ItemTemplate>
</asp:ListView>

Where UcTPPaymentCheque_OnCancelClick is the function you should use to handle the event, in the control that contains the listview.

Upvotes: 0

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