I’m working with VS.NET 2000 and a Code behind file.

I’m creating a ImageButton control for each item in a collection in the code behind file, and I want each ImageButton control to raise the same event. Then I can determine the CommandName that would signify the list item selected.

I’m supposed to use OnCommand event, however Intelisence and compilation return errors.

Example:

foreach(string fileName in fileEntries)
{
    ibImageList = new ImageButton();
    ibImageList.ImageUrl = GetDirectoryName(fileName);
    ibImageList.Width = new Unit(125, UnitType.Pixel);
    ibImageList.CommandName = GetDirectoryName(fileName);
    ibImageList.OnCommand = "ibImageList_Command()";

    //Add it to the panel
    pnlImages.Controls.Add(ibImageList);
    pnlImages.Controls.Add(new LiteralControl("<br>"));
}

I've tried ibImageList.Command also, and get an error that says something like "...on the left of += or -=..."

I want to program the OnCommand during the enumeration of a collection process, but I don’t have that option? What am I missing here?

Brian


Brian Sausser, MCP
(858) 229-6129

__________________
Brian Sausser, MCP
(858) 229-6129

Try something along these lines:

ibImageList.Click += new System.EventHandler(ibImageList_Command);

I tried that and got this compile error:
Method 'SausserFamily.photos._default.ibImageList_Command (object, System.Web.UI.WebControls.CommandEventArgs)' does not match delegate 'void System.EventHandler(object, System.EventArgs)'


Brian Sausser, MCP
(858) 229-6129

Ok then, sounds like you need to fix the button click handler to have the right signature as the error suggests. You handler should look something like this:

Sub ibImageList_Command(sender As Object, e As System.EventArgs)

Nope, it's not compiling.

I'm supposed to use _OnCommand, but I can only use that when I'm in the asp tags in the aspx file. (refer to original problem)

I want to use behind *.cs file to create the ImageButtons. I need to have them all point to one procedure like .Click(...) and then read the command name and argument to determine what to do inside the .Click(...) procedure.

I'm not sure, I made my problem clear in the first message. Anyway, any ideas?

Brian

Brian Sausser, MCP
(858) 229-6129

Anyone?

I have the same problem in other areas, where I want to list a collection, with imagebuttons that point to one _click procedure.

I know this can be done, however I can not find an example in the documentation or on the web.

Brian

Brian Sausser, MCP
(858) 229-6129

Hello,

Create a new event handler, named whatever, that has the parameters of what Peter supplied up above:

private void MyEH(object sender, eventargs e) {
  ..
}

..
ibImageList.Click += New System.EventHandler(MyEh)
ibImageList2.Click += New System.EventHandler(MyEh)

Hope this helps,

Brian

I'm still getting a compile error: "c:\inetpub\wwwroot\dendera\wfhm\test.aspx.cs( 30): Cannot implicitly convert type 'System.EventHandler' to 'System.Web.UI.ImageClickEventHandler'"

This is the exact code I have:
private void Page_Load(object sender, System.EventArgs e)
{
      ImageButton ibTest;
      for (int i=0; i<5; i++)
      {
    ibTest = new ImageButton();
    ibTest.ImageUrl = "../images/bluearrow.gif";
    ibTest.CommandArgument = i.ToString();
    ibTest.Click += new System.EventHandler(MyEh);

    pnlTest.Controls.Add(ibTest);
    pnlTest.Controls.Add(new LiteralControl(""));
      }
}
private void MyEh(object sender, EventArgs e)
{
    //Blah
}

I'm sorry about this; your help makes logical sense, but it's not working for me??

Brian


Brian Sausser, MCP
(858) 229-6129

Hay Brian,

I was having the exact same issue, and here is how I solved it…

First off you can’t use System.EventHandler with an ImageButton. You need to use System.Web.UI.ImageClickEventHandler.

So, it should look like this...

ibImageList.Click += New System.Web.UI.ImageClickEventHandler(MyEh)


with the event function being ...

private void MyEh(object sender, System.Web.UI.ImageClickEventArgs e)
{
    ImageButton LocIB = (ImageButton)sender;
    // do your stuff here...
}

That should fix your compile errors.

Now for why the event is not firing.

My guess is your only creating the ImageButtons the first time the page loads. The problem with that is when you do a post back the bindings are gone. You need to make the bindings every time the page loads. For this to work well you will want to make sure you name every dynamic button you create, and make sure that instance of the button will have the same name for each page load. You set the name with ibImageList.ID = “whatever”.

Also, you can set the CommandArgument for the button and then read it in your function to figure out what button got clicked.

So, here is the logical progression of it all…

Someone goes to your page.
The page loads and runs the Page_Load event.
In that event the all your buttons get created along with the event bind.
Then someone clicks one of those buttons.
Everything gets wiped server side (other then viewstate and session stuff).
The Page_Load function is run again.
If this is a postback the server looks at the ID of the object posting back and looks to see if any events need to be fired.
If it finds an event associated with the ID of the clicked object it then runs that event.

So, if you have all your bindings in a “if (!Page.IsPostBack)” block, your events will never fire as they are not associated on the page reload.

I hope this helps.

God luck,
Jeremy

Hello Everyone

I am developing one Mobile Application.
This is an devicespecific application
in which have one Mobile user control.
as follow

<mobile:panel id="BottomPanel" Runat="server">
<mobile:DeviceSpecific id="DeviceSpecific1" Runat="server">
<Choice Filter="isHTML32" >
<ContentTemplate>
<asp:ImageButton id="cmdLogoutASCX" ImageUrl="..\images\buttons\logout.gif" runat="server"></asp:ImageButton>
</ContentTemplate>
</Choice>
</mobile:DeviceSpecific>
</mobile:panel>

and this Mobile user control included in aspx file

when i am trying to create event for imagebutton in user control i am getting following error

Method does not match delegate 'void System.Web.UI.ImageClickEventHandler(object, System.Web.UI.ImageClickEventArgs)'

If you have any solution
Plz.

Thanks in advance.