Command Event in button being magically invoked.

[John Bankhead]

Top of page: Listbox and button. Listbox contains a list of products.
Button says "Load". Beneath both is a datagrid. In the datagrid, 25 columns
contain text and one of the columns contains a textbox or button depending on
the nature of the account. Clicking a button in this column causes a
round-trip to the server and another control to appear on top of the datagrid
for more detailed info.

Here is the problem: Loading the datagrid with a product which shows buttons
will cause that detailed control to appear for the datagrid row to have a
button in that column. No clicking on the button is necessary. How is the
command event for that button being invoked?

All of the datagrid buttons are created in the ItemDataBound event for the
datagrid. Their command events are attached to "private void
btnTier_Command(object sender, CommandEventArgs e)" and each carries the id
of its particular account in the CommandArgument attribute.

from ItemDataBound event:

if(e.Item.Cells[tieredColumn].Text=="TIERED"){
b = new Button();
b.ID = "revprice_" + Counter.ToString();
b.Text = e.Item.Cells[RevPriceCol].Text;
b.Width = Unit.Pixel(58);
b.BackColor = bModded? Color.FromArgb(220, 248, 217) : Color.LightGray;
b.ForeColor = bException? Color.Red : Color.Black;
b.CommandArgument = e.Item.Cells[AcctCol].Text;
b.CommandName = "btnTier";
b.Command+=new CommandEventHandler(btnTier_Command);
b.Enabled = bExclude;
e.Item.Cells[RevPriceCol].Controls.Add(b);
}

-------------------
private void btnTier_Command(object sender, CommandEventArgs e){
int acct = Convert.ToInt32(e.CommandArgument);
AccountTier tier = new AccountTier(acct, Decision, dstConnectionString);
tier.ID = "tiered";
tier.Attributes.Add("style",
"z-index:300;position:absolute;top:125;left:100;");
this.Controls.Add(tier);
}

 

[John Bankhead]

1) Have you attempted to do a step by step debugging to determine if in fact
your btnTier_Command function is being invoked?

Yes, I have and yes, it is. If there is a way for the debugger to show me
what invoked the event, then I am not deft enough to find it.

2) Does this happen when you first load this page?

No. When I first load the page, no product information is loaded as per
design. The user has to choose which of many products he wants to see
account info for. If I choose a product that has an account with button then
the "phantom event" occurs the first time those accounts are loaded. If I
reload the same product, it does not occur again. If I switch to another
product then it happens the first time, but not subsequently. If I switch
again to the previous product, or to another, then the same behavior occurs.

3) That is the base class of AccountTier?

public class AccountTier : System.Web.UI.WebControls.WebControl

Coding question for my own curiosity: Why are you dynamically creating the
controls? (Buttons and AccountTier).

I needed buttons in the datagrid when I don't know how many rows there will
be or whether the data in that particular row warrants a button or a textbox.
It seemed the best way to accomplish the goal. How should I have done it?

As for the AccountTier, it just seemed like a good idea at the time. The
only time I want to see the AccountTier control is when I click on a button
on the data grid. I just figured, why spend the resources to create it when
I didnt need it.

Steve

Top of page: Listbox and button. Listbox contains a list of products.
Button says "Load". Beneath both is a datagrid. In the datagrid, 25
columns
contain text and one of the columns contains a textbox or button depending
on
the nature of the account. Clicking a button in this column causes a
round-trip to the server and another control to appear on top of the
datagrid
for more detailed info.

Here is the problem: Loading the datagrid with a product which shows
buttons
will cause that detailed control to appear for the datagrid row to have a
button in that column. No clicking on the button is necessary. How is
the
command event for that button being invoked?

All of the datagrid buttons are created in the ItemDataBound event for the
datagrid. Their command events are attached to "private void
btnTier_Command(object sender, CommandEventArgs e)" and each carries the
id
of its particular account in the CommandArgument attribute.

from ItemDataBound event:

if(e.Item.Cells[tieredColumn].Text=="TIERED"){
b = new Button();
b.ID = "revprice_" + Counter.ToString();
b.Text = e.Item.Cells[RevPriceCol].Text;
b.Width = Unit.Pixel(58);
b.BackColor = bModded? Color.FromArgb(220, 248, 217) : Color.LightGray;
b.ForeColor = bException? Color.Red : Color.Black;
b.CommandArgument = e.Item.Cells[AcctCol].Text;
b.CommandName = "btnTier";
b.Command+=new CommandEventHandler(btnTier_Command);
b.Enabled = bExclude;
e.Item.Cells[RevPriceCol].Controls.Add(b);
}

-------------------
private void btnTier_Command(object sender, CommandEventArgs e){
int acct = Convert.ToInt32(e.CommandArgument);
AccountTier tier = new AccountTier(acct, Decision, dstConnectionString);
tier.ID = "tiered";
tier.Attributes.Add("style",
"z-index:300;position:absolute;top:125;left:100;");
this.Controls.Add(tier);
}