Onserverclick is not running

Question

I am trying to create dynamic buttons to delete users from a database but onserverclick simply does not run the function.

This is my code so far:

yourHTMLstring += "<td>" + dt.Rows[i]["NivelAcesso"] + "<button id='"+idx+ "' type='submit' runat='server' onserverclick='deleteRow' class='btn btn-light float-right'><i class='fas fa-trash-alt'></i></button></td>";

This is the function:

protected void deleteRow(object sender, EventArgs e)
    {

        Button button = (Button)sender;
        string buttonId = button.ID;

        SQL _sql = new SQL();

        _sql.DeleteUtilizadores(Convert.ToInt32(buttonId));
    }

Answer 1

So that the bind of onserverclick work it needs to be declared physically in your aspx. This is because in the render event and before the Page_load ASP.Net will parse your content and replace your onserverclick='deleteRow' by a javascript call responsible for PostBack to the server, in the click of the element.

See the example below where the control was added to Default.aspx:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication.Form._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">

    <button id='lbotao' type='submit' runat='server' onserverclick='deleteRow' class='btn btn-light float-right'><i class='fas fa-trash-alt'></i>teste</button>

</asp:Content>

Now see how the component is rendered in the browser:

<button onclick="__doPostBack('ctl00$MainContent$lbotao','')" id="MainContent_lbotao" type="submit" class="btn btn-light float-right"><i class="fas fa-trash-alt"></i></button>

As you are adding control as an html string this conversion will not be performed and you will end up with a simple transcription of what you declared.

<button id="lbotao" type="submit" runat="server" onserverclick="deleteRow" class="btn btn-light float-right"><i class="fas fa-trash-alt"></i></button>