Is this thing on? Wow, I forget about this from time to time. :)

While working on our latest version of OnTime (v9.1, coming soon to a website near you), I ran into an interesting bug in OnTime web. If you had the attachments tab selected, and selected an item, 2 identical requests would get issued to a page called "ControlHandler.aspx", which handles all of our detail tab pages (for thinks like attachments, email messages, and history). I wasn't sure where this was coming from, so I poked around a bit. It turns out that having an <img /> tag on a page with an empty src attribute (like so: <img src="" />) causes that image tag to point to the containing page, causing the entire page to get requested again (causing any code-behind you have to get executed again), but the response just gets thrown away, since the img tag is only expecting an image back from the server, not an HTML document.

The way around this is to remove the src attribute altogether, you can still set the image source through javascript.

You can see an example of this, here (with the empty src attribute) and here (with the src attribute removed). Make sure you have fiddler turned on and refresh your cache to see what I'm talking about.

Jonas