Strange Issue on replacing Image control with ImageButton control

[jens.buchta]

Hi!

I'm using a DataGrid with a template column to display an Image inside
of it. I'm hooking into its OnPrerender-Event to set the
ImageURL-Property dynamically.
Everything works just fine here, until I thought "It would be cool, if
the user could click on that image..". So I replaced the Image-Control
with an ImageButton.

My Problem is, that the ImageButton doesn't fire any events. Any other
control works just fine but I'm having no luck getting the ImageButton
to work.

I'm happy about any ideas..

Regards
Jens


------------------------------------------------
Code-Snippet

-------------------
aspx-Page

<asp:TemplateColumn HeaderText="Images">
<ItemTemplate>
<asp:Image id="imgPic" runat="server"
OnPreRender="imgPic_PreRender"></asp:Image>&nbsp;
<asp:ImageButton id="ibtnPic" runat="server"
OnPreRender="ibtnPic_PreRender"></asp:ImageButton>
</ItemTemplate>
</asp:TemplateColumn>

-------------------
CodeBehind

protected void imgPic_PreRender(object sender, System.EventArgs e)
{
//this works as expected
Image img = sender as Image;
if (img == null)
{
return;
}
img.ImageURL = "dynamically-assigned.jpg";
}

protected void ibtnPic_PreRender(object sender, System.EventArgs e)
{
//this does not work
//
//if I rename this Method for testing purposes, the Page can't
//be loaded, as it doesn't find this Method
//
//if I set a Break-Point to first method, the program does not
//stop
ImageButton ibtn = sender as ImageButton;
if (ibtn == null)
{
return;
}
ibtn.ImageURL = "dynamically-assigned.jpg";
}

 

[jens.buchta]

Thanks for your Answer!

I can set up the Click event to parse the CommandName and
CommandArgument. This is a way to react on the users PostBack, no
problem here.

The problem is, that i need the PreRender event to handle the ImageURL
before the ImageButton is drawn. At the moment, I can't catch this
event in the same way, as it works for the Image-control, so that the
image, the ImageButtons renders, is "none".

Jens

 

[Eliyahu Goldin]

Jens,

With thwe ImageButton you can setup both the Click and Command events. Do
you setup one of them?

Eliyahu

 

[Eliyahu Goldin]

Why can't you handle the ImageUrl in Click event?

Eliyahu