CascadingDropDown: Fire an Event

I have created a custom control that contains 3 CascadingDropDown boxes.

I would like to have the control fire a custom event when each of the "TextChanged" or "SelectedIndexChanged" events from the Drop Down items change.

I have added the appropriate "events" into my code behind, but they do not seem to fire. Does the JavaScript intercept them?

Any help would be greatly appreciated.

Thanks,
Bryan

The Changed events you rever to are server-side events that only fire when there's a postback. By design, CascadingDropDown doesn't do postbacks. So you don't get those events when using it. You could force a postback, but doing so would seem to negate many of the benefits of the CDD.

Mr. Anson,

Perhaps you could point me in a better direction for my needs.

The Custom Control that I have created consists of 3 CascadingDropDowns that allow the user to select a Location, Skill, and Supervisor (basically this is like the Make/Model/Color sample for the car.).

My control works fine when I incorporate a button to run a report on a different page. My Button_OnClick event can see what values are in my control, and it will send them to the new page.

I would like to incorporate my current control on a page to help narrow down yet another Drop Down List.

In the CDD example, after the user selects the Make/Model/Color, I would like to pull a list of Vehicles by Year to select.

How would I go about hooking up a new CDD that requires the control to have filled in the Make/Model/Color before it can go out and find it's data?

I thought that I could do something like placing the control and drop down list inside an update panel, but I am a little fuzzy on how to continue from there.

Would I need to set up an Atlas Trigger?

Any help that you can provide would be greatly appreciated. It would even help if you could point me in a better direction.

Thanks, Bryan

Could you add a ByYear CDD that has the Color CDD as its parent? That way it automatically populates when the Make/Model/Color are filled in. And it's welcome to call a completely different web service, so it can get whatever data it wants.

If my Make/Model/Color are in a seperate control, how will I be able to give my Year CDD the parent that is inside the control? Can I just expose the CDD as a public member?

I don't want to add the Year CDD into my control. A different page may want to populate a different CDD from the data that the control provides.

You could manually hook some script up to the "onchanged" event on the client-side select element, but it's probably ultimately the same problem as above with respect to how the Year can see into the control to get the right elements.