ImageButton event does not fire if ImageButton does not have Image?

Question

Is it normal behavior for an ImageButton event to not fire if it can't find the image for it. For example, assume I have the following piece of code:

imageLink = new ImageButton();
imageLink.ImageUrl = "~/images/arrow.png";

If the page finds arrow.png, the image click works, but if it doesn't find it, it does not work.

These images are created dynamically and a CommandName, CommandArgument and Click Handler are assigned.

void imageLink_Click(object sender, ImageClickEventArgs e)
{
    ImageButton button = (ImageButton)sender;
    Detail oDetail = new Detail();

    switch(button.CommandName)
    {
        case "Band":
             oDetail.Band  = button.CommandArgument;
                break;
            case "State":
                oDetail.State = button.CommandArgument;
                break;
        }                    

        Session["Page2"] = oDetail;

        Response.Redirect("~/Page2.aspx");
    }

Answer 1

No, that is not normal. I just tested and even if you never set ImageUrl the button will still post back. Are you certain that the issue is not related to event handling?

Answer 2

In some cases, it happens Image button events are not firing sometime without image Anybody know the exact reason behind this issue, please post here

Answer 3

Hi,

yes, that's right. If the ImageButton doesn't have an ImageUrl declared, it won't fire the onclick event. It will cause a Postback, but the event isn't fired.

This code won't fire the event

<asp:ImageButton ID="testImgBtn" ImageUrl="" runat="server" onclick="testImgBtn_Click" />

while this does:

<asp:ImageButton ID="testImgBtn" ImageUrl="http://www.google.it/intl/en_en/images/logo.gif" runat="server" onclick="testImgBtn_Click" />