Dynamically Swapped UserControl: EventListeners of Buttons of UserControls are not firing

Question

User-1845357238 posted

I have two links, User Settings, Space Settings and two UserControls, UserSettings and SpaceSettings

What I want to do:

• On first time when user will visit the page he will see the User Settings.
• Depending on which one of these two links has been clicked, the PlaceHolder will swap UserControl.
• EventListeners of Buttons of UserControls should fired.

So I wrote the

SiteSettings.aspx:

    <asp:UpdatePanel runat="server">
        <ContentTemplate>
            <asp:Panel ID="Panel1" runat="server">
                <asp:LinkButton ID="UserLink" runat="server" OnClientClick="$('#MainContent_JYM').val('User');"
                    OnCommand="SettingsLink_OnCommand" CommandName="User" Text="User Settings" />
            </asp:Panel>
            <asp:Panel ID="Panel2" runat="server">
                <asp:LinkButton ID="SpaceLink" runat="server" OnClientClick="$('#MainContent_JYM').val('Space');"
                    OnCommand="SettingsLink_OnCommand" CommandName="Space" Text="Space Settings" />
            </asp:Panel>
            <asp:Panel ID="PlaceHolderPanel" runat="server" Style="min-height: 500px">
                <asp:PlaceHolder runat="server" ID="SettingsPlaceholder" />
            </asp:Panel>
            <asp:HiddenField runat="server" ID="JYM" />
        </ContentTemplate>
    </asp:UpdatePanel>

UserSettings.ascx:

    <asp:Panel runat="server">    
         <asp:Button runat="server" ID="User" Text="User" onclick="UserSettingsButton_Click" />
    </asp:Panel>

 SpaceSettings.ascx:

   <asp:Panel runat="server">    
        <asp:Button runat="server" ID="Space" Text="Space" onclick="SpaceSettingsButton_Click" />
   </asp:Panel>

SiteSettings.ascx.cs:

   public partial class SiteSettings : Page {	

		protected void Page_Load(object sender, EventArgs e) {
			string key = JYM.Value;
			if (key == null || key.Trim().Length == 0) {
				AddUserSettings();
			} else {
				if (key.Equals("User")) {			
					AddUserSettings();
				} else {			
					AddSpaceSettings();
				}
			}
		}
	
		protected void SettingsLink_OnCommand(object sender, CommandEventArgs commandEventArgs) {	    
			switch (commandEventArgs.CommandName) {
				case "User":
					AddUserSettings();
					break;		   
				case "Space":
					AddSpaceSettings();
					break;
			}
		}

		private void AddUserSettings() {
			AddSettings(LoadControl("~/UserControls/UserSettings.ascx") as UserSettings);
		}

		private void AddSpaceSettings() {
			AddSettings(LoadControl("~/UserControls/SpaceSettings.ascx") as SpaceSettings);
		}

		private void AddSettings(UserControl control) {
			SettingsPlaceholder.Controls.Clear();
			SettingsPlaceholder.Controls.Add(control);
		}
    }

SpaceSettings.ascx.cs:

    public partial class SpaceSettings : Spring.Web.UI.UserControl {

	protected void SpaceSettingsButton_Click(object sender, EventArgs e) {
	    System.Diagnostics.Debug.WriteLine("SpaceSettings--------------");
	}
    }

UserSettings.ascx.cs:

    public partial class SpaceSettings : Spring.Web.UI.UserControl {

	protected void SpaceSettingsButton_Click(object sender, EventArgs e) {
	    System.Diagnostics.Debug.WriteLine("UserSettings--------------");
	}
    }

Now everything is fine, excpet the EventListeners correspond to the User button of UserSettings and Space button of SpaceSettings, are fireing on seond time and so on clicking.

How can I solve this problem?

Thanks.

Answer 1

User-1845357238 posted

I found the soultion. The problem is the ID of UserControlbeing added. I have modified two methods AddUserSettings and AddSpaceSettings in the following way:

private void AddUserSettings() {
	UserSettings settings = LoadControl("~/UserControls/UserSettings.ascx") as UserSettings;
	settings.ID = "usersetting";
	AddSettings(settings);
}

private void AddSpaceSettings() {
	SpaceSettings settings = LoadControl("~/UserControls/SpaceSettings.ascx") as SpaceSettings;
	settings.ID = "spacesettings";
	AddSettings(settings);
}

Now it is working.

Answer 2

User3866881 posted

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