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aspx thread: How do I programmatically determine which button was clicked?
Message #1 by gwade@w... on Fri, 11 Jan 2002 20:06:09
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I'm reading Chapter 7 (Event-driven Programming and Postback) in Beginning
ASP.NET USING C# regarding the ASP.NET Button Server control. I want to
put multiple command buttons on a web form and then programmatically
determine which button was clicked in the event handler. I saw some code
at MSDN (http://msdn.microsoft.com/library/default.asp?url=/library/en-
us/cpgenref/html/cpconbuttonwebcontrol.asp) that does this
but I can't get it to work. I receive the following error:
CS0123: Method 'ASP.ticTacToe_aspx.CommandBtn_Click(object,
System.Web.UI.WebControls.CommandEventArgs)' does not match
delegate 'void System.EventHandler(object, System.EventArgs)'
My version of this code is:
(Note: For now, I am only trying to get this code to work
with one button)
<script Language="c#" runat="server">
void CommandBtn_Click(object sender, CommandEventArgs e)
{
message.Text = "You clicked the " + e.CommandName + " - " +
e.CommandArgument + " button.";
}
</script>
<html>
<head>
<title>TicTacToe</title>
</head>
<body>
<form runat="server">
<asp:Button id="SortAscendingButton"
Text="Sort Ascending"
CommandName="Sort"
CommandArgument="Ascending"
OnClick="CommandBtn_Click"
runat="server" />
<br /><br />
<asp:label id="message" runat="server" />
</form>
</body>
</html>
Does anyone have any suggestions? I understand that my event
is being called with the wrong parameter type (i.e. EventArgs rather than
CommandEventArgs. My question is how do I get this to work.
Or is there another way of doing this. I can't seem to find anyone else on
the Internet who has had this problem. Thank you.
Message #2 by "Albert Davis" <albertdavis@h...> on Fri, 11 Jan 2002 15:12:19 -0500
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The error that you are receiving is telling you that your delegate has the
wrong signature to what the System.Web.UI.WebControls.Button Class needs for
you signin up for it's multicasted Click event... You need to be using
EventArgs not CommandEventArgs...
Al
>From: gwade@w...
>Reply-To: "ASP+" <aspx@p...>
>To: "ASP+" <aspx@p...>
>Subject: [aspx] How do I programmatically determine which button was
>clicked?
>Date: Fri, 11 Jan 2002 20:06:09
>
>I'm reading Chapter 7 (Event-driven Programming and Postback) in Beginning
>ASP.NET USING C# regarding the ASP.NET Button Server control. I want to
>put multiple command buttons on a web form and then programmatically
>determine which button was clicked in the event handler. I saw some code
>at MSDN (http://msdn.microsoft.com/library/default.asp?url=/library/en-
>us/cpgenref/html/cpconbuttonwebcontrol.asp) that does this
>but I can't get it to work. I receive the following error:
>
>CS0123: Method 'ASP.ticTacToe_aspx.CommandBtn_Click(object,
>System.Web.UI.WebControls.CommandEventArgs)' does not match
>delegate 'void System.EventHandler(object, System.EventArgs)'
>
>My version of this code is:
>
>(Note: For now, I am only trying to get this code to work
>with one button)
>
><script Language="c#" runat="server">
>void CommandBtn_Click(object sender, CommandEventArgs e)
>{
> message.Text = "You clicked the " + e.CommandName + " - " +
>e.CommandArgument + " button.";
>
>}
></script>
><html>
> <head>
> <title>TicTacToe</title>
> </head>
> <body>
> <form runat="server">
> <asp:Button id="SortAscendingButton"
> Text="Sort Ascending"
> CommandName="Sort"
> CommandArgument="Ascending"
> OnClick="CommandBtn_Click"
> runat="server" />
> <br /><br />
> <asp:label id="message" runat="server" />
> </form>
> </body>
></html>
>
>Does anyone have any suggestions? I understand that my event
>is being called with the wrong parameter type (i.e. EventArgs rather than
>CommandEventArgs. My question is how do I get this to work.
>Or is there another way of doing this. I can't seem to find anyone else on
>the Internet who has had this problem. Thank you.
_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com
Message #3 by "Albert Davis" <albertdavis@h...> on Fri, 11 Jan 2002 15:17:05 -0500
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Or you could change the eventtype on your webcontrol from "OnClick" to
"OnCommand" and it should work as well... Click and Command both get fired
when the button is clicked...
>From: gwade@w...
>Reply-To: "ASP+" <aspx@p...>
>To: "ASP+" <aspx@p...>
>Subject: [aspx] How do I programmatically determine which button was
>clicked?
>Date: Fri, 11 Jan 2002 20:06:09
>
>I'm reading Chapter 7 (Event-driven Programming and Postback) in Beginning
>ASP.NET USING C# regarding the ASP.NET Button Server control. I want to
>put multiple command buttons on a web form and then programmatically
>determine which button was clicked in the event handler. I saw some code
>at MSDN (http://msdn.microsoft.com/library/default.asp?url=/library/en-
>us/cpgenref/html/cpconbuttonwebcontrol.asp) that does this
>but I can't get it to work. I receive the following error:
>
>CS0123: Method 'ASP.ticTacToe_aspx.CommandBtn_Click(object,
>System.Web.UI.WebControls.CommandEventArgs)' does not match
>delegate 'void System.EventHandler(object, System.EventArgs)'
>
>My version of this code is:
>
>(Note: For now, I am only trying to get this code to work
>with one button)
>
><script Language="c#" runat="server">
>void CommandBtn_Click(object sender, CommandEventArgs e)
>{
> message.Text = "You clicked the " + e.CommandName + " - " +
>e.CommandArgument + " button.";
>
>}
></script>
><html>
> <head>
> <title>TicTacToe</title>
> </head>
> <body>
> <form runat="server">
> <asp:Button id="SortAscendingButton"
> Text="Sort Ascending"
> CommandName="Sort"
> CommandArgument="Ascending"
> OnClick="CommandBtn_Click"
> runat="server" />
> <br /><br />
> <asp:label id="message" runat="server" />
> </form>
> </body>
></html>
>
>Does anyone have any suggestions? I understand that my event
>is being called with the wrong parameter type (i.e. EventArgs rather than
>CommandEventArgs. My question is how do I get this to work.
>Or is there another way of doing this. I can't seem to find anyone else on
>the Internet who has had this problem. Thank you.
_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com
Message #4 by gwade@w... on Fri, 11 Jan 2002 20:49:55
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Thanks Al.
Changing
OnClick="CommandBtn_Click"
to
OnCommand="CommandBtn_Click" did the trick.
Now I can programmatically determine what was clicked. Incidentally I
rechecked the documentation at MSDN (url above) and it uses OnClick.
Thanks again!
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