asp.net Repeater Button does not fire event on first page load but after postback it does

Question

I have a strange problem with a Button within a Repeater

when the site is loaded (Dotnetnuke settings page) the repeater is fully created and everything works except the buttons in the repeater. they do just nothing i have set in very line on the code a breakpoint to be sure it doesn't do anything.

After an other Button(runs CreateButton) does a Postback (rebind of the repeater happens) they work as expected.

here is my code:

<asp:Repeater ID="rptForm" runat="server" EnableViewState="true" ItemType="ButtonObject" >
<%--OnItemCommand="rpt_ItemCommand"  OnItemDataBound="Repeater_ItemDataBound"--%>
    <HeaderTemplate>
        <table class="ButtonTable">
            <tr class="ButtonTableHeader">
                <td>Id</td>
                <td>Name</td>
                <td>Link</td>
                <td></td>
                <td></td>
            </tr>
    </HeaderTemplate>
    <ItemTemplate>
        <tr>
            <td>
                <%# Item.Id %>
            </td>
            <td>
                <%# Item.Name %>
            </td>
            <td>
                <%# Item.Link %>
            </td>

            <td>
                <asp:Button ID="EditBtn" runat="server" Text="Editieren"
                data-ButtonId="<%# Item.Id %>"
                CssClass="uk-button uk-button-primary"
                OnClick="EditButton"/>
                <%--CommandName="edit" CommandArgument="<%# Item.Id %>" --%>
            </td>
            <td>
                <asp:Button ID="DeleteBtn" runat="server" Text="Button Löschen"
                 data-ButtonId="<%# Item.Id %>"
                 CssClass="uk-button uk-button-primary"
                 OnClick="DeleteButton"/>
                <%--CommandName="delete"  CommandArgument="<%# Item.Id %>"--%>
            </td>

        </tr>
    </ItemTemplate>
    <FooterTemplate>
        </table>
    </FooterTemplate>
</asp:Repeater>

and here is code behind:

private static ButtonSettings BtnSettings = new ButtonSettings();

    protected void Page_Init(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BtnSettings = new ButtonSettings();
            if (Settings.Contains("ButtonSettings"))
            {
                BtnSettings.BuildButtonSettings(Settings["ButtonSettings"].ToString());
            }
            BindRepeater();
        }
    }

private void BindRepeater()
    {
        this.rptForm.DataSource = BtnSettings.Buttons;
        this.rptForm.DataBind();
    }

    protected void rpt_ItemCommand(object sender, RepeaterCommandEventArgs e)
    {
        //This Method will not be executed first time when site loads
        if (e.CommandName == "edit") // add this
        {
            EditButtonDiv.Visible = true;
        }
    }

    protected void Repeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item)
        {
            Button button = (Button)e.Item.FindControl("DeleteBtn");
            if (button != null)
            {
                button.Click += DeleteButton;
            }
        }
    }

    protected void DeleteButton(Object sender, EventArgs e)
    {
        //This Method will not be executed first time when site loads
        Button button = sender as Button;
        var buttonID = Convert.ToInt32(button.Attributes["data-ButtonId"].ToString());

        BtnSettings.RemoveButton(buttonID);
        BindRepeater();
    }

    protected void EditButton(Object sender, EventArgs e)
    {

        //This Method will not be executed first time when site loads
       /* TODO:: Get ButtonId -  Set values */
        EditButtonDiv.Visible = true;
    }

    protected void CreateButton(Object sender, EventArgs e)
    {
        var buttonObj = new ButtonObject();
        ...
        BindRepeater();

        ScriptManager.RegisterStartupScript(Page, this.GetType(),
                    "script", "ReRegisterDivEvents()", true);
        ScriptManager.RegisterStartupScript(Page, this.GetType(),
                    "script", "ClearForm()", true);
    }

Where i'm doing a mistake?

Answer 1

Well i cloud bang my head...

i finally found a solution why it didn't work, thx to https://siderite.dev/blog/dopostback-works-webformdopostbackwitho.html

Solution I had a validator on this site, something like this:

<asp:RequiredFieldValidator 
ControlToValidate="name" 
ForeColor="Red"
ErrorMessage="Button Name is requierd" 
runat="server">*</asp:RequiredFieldValidator>

this did prevent the button event because the input was empty.