Question

Hey guys Im getting no postback on my button? I have it tied to Javascript like so:

<script type="text/javascript">
function confirm_delete()
{
  if (confirm("Are you sure you want to delete this comment?")==true)
    return true;
  else
    return false;
}
</script>
<p>
<asp:Button ID="btn" OnClientClick="if(confirm_delete()){/* post back*/}else{return false;};" OnClick="btnDelete_Click" runat="server" CssClass="Btn" Text="delete"/>

But when I click ok on confirm no postback is initiated, its initiated if I click the button manually?

private void PopulateWallPosts(string userId)
{

    using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
    {
        cn.Open();
        using (OdbcCommand cmd = new OdbcCommand("SELECT idWallPosting, wp.WallPostings, p.PicturePath FROM WallPosting wp LEFT JOIN User u ON u.UserID = wp.UserID LEFT JOIN Pictures p ON p.UserID = u.UserID WHERE wp.UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
        {
            //("SELECT wp.WallPostings, p.PicturePath FROM WallPosting wp LEFT JOIN [User] u ON u.UserID = wp.UserID LEFT JOIN Pictures p ON p.UserID = u.UserID WHERE UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
            using (OdbcDataReader reader = cmd.ExecuteReader())
            {
                test1.Controls.Clear();

                while (reader.Read())
                {

                    System.Web.UI.HtmlControls.HtmlGenericControl div = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
                    div.Attributes["class"] = "test";


                    div.ID = String.Format("{0}", reader.GetString(0));
                    // this line is responsible, problem here and my sqlsntax, im trying to set the SELECT idWallPosting for the div ID
                    Image img = new Image();
                    img.ImageUrl = String.Format("{0}", reader.GetString(2));

                    img.AlternateText = "Test image";

                    div.Controls.Add(img);
                    div.Controls.Add(ParseControl(String.Format("&nbsp&nbsp " + "{0}", reader.GetString(1))));
                    div.Attributes.Add("onclick", "return confirm_delete();");

                    div.Style["clear"] = "both";
                    test1.Controls.Add(div);

                }
            }
        }
    }
}

protected void btnDelete_Click(object sender, EventArgs e)
{

    string id = "ctl00_ContentPlaceHolder1_ContentPlaceHolder2_26";
    string[] idFragments = id.Split('_');
    id = idFragments[idFragments.Length - 1];

    //serverside code if confirm was pressed.
        using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
        {
            cn.Open();
            using (OdbcCommand cmd = new OdbcCommand("DELETE FROM WallPosting WHERE idWallPosting = " + id + ")", cn))
            {
                cmd.ExecuteNonQuery();
            }
        }
        //PopulateWallPosts();

}

EDIT: Tried this:

function confirm_delete()
{
  if (confirm("Are you sure you want to delete this comment?") == true)
    return true;
  else
    return false;
}
</script>
<p>
<asp:Button ID="btn" OnClientClick="return confirm_delete();" OnClick="btnDelete_Click" runat="server" CssClass="Btn" Text="delete"/>

still no postback

Answer 1

I don’t see anywhere that you’re explicitly telling asp.net that your confirmation was successful. Remember if you don’t return something, then it will default to false. Your OnClientClick should just be "return confirm_delete();", then it should work.

OnClientClick is always suppposed to return a boolean letting ASP.NET know that it should indeed post back and fire your server-side OnClick event.