Troubleshooting: ASP/C# - Issue with UpdatePanel not triggering Button OnClick Event

I've been attempting to discover the solution, however it would be greatly appreciated if someone could take a look.

Within my aspx page and C# codebehind, I have the following:

aspx:

<asp:UpdatePanel runat="server" ID="UpdatePanel8" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="btnAddTableRow" EventName="Click" />
    </Triggers>
    <ContentTemplate>
        <div id="divDynamicFields" runat="server"></div>
    </ContentTemplate>
</asp:UpdatePanel>

<div hidden>
    <asp:Button ID="btnAddTableRow" runat="server" OnClick="AddTableRow" />
</div>

<script type="text/javascript">
    function addTableRow(tableId) {
        $('#<%=btnAddTableRow.ClientID%>').click();
    }
</script>

C#:

protected void AddTableRow(object sender, EventArgs e)
{
    (...)
}

The event triggers without issues if I do not use UpdatePanel. However, with UpdatePanel, there is a PostBack but the C# method does not get called. I have been trying to figure this out for some time now with no success. Any suggestions? Appreciate your help.

Answer №1

After a restful night's sleep and a clear mind, I finally uncovered the source of the issue. The JS function addTableRow(tableId) was being called by dynamically created buttons within Page_Load. These buttons were not fixed in number, so they needed to be associated with this JS function in order to click the hidden button that triggers the event method from codebehind. The problem lied in how I was generating these buttons:

Button addRowButton = new Button();
addRowButton.Text = "This is my dynamic button";
addRowButton.Attributes.Add("onclick", "addTableRow('" + idControl + "')");

However, everything started functioning correctly when I made the switch to:

HtmlGenericControl addRowButton = new HtmlGenericControl("input");
addRowButton.Attributes.Add("type", "button");
addRowButton.Attributes.Add("onclick", "addTableRow('" + idControl + "');");
addRowButton.Attributes.Add("value", "This is my dynamic button");

Interestingly enough, the Button() generated button was still able to invoke the JS function addTableRows and trigger a PostBack, but it did not invoke the code behind method. This could possibly be attributed to the page life cycle and the way in which the IDs for dynamic buttons are generated differently when creating them as Button or HtmlGenericControl. In any case, it is now functioning as intended.

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