C# / ASP

janvov · May 9th, 2006, 04:24 AM

Hi there,

Can anyone help out with a simple thing but bear in mind I am a novice. I have a problem trying to implement dropdownlist selection dependant form content. I have a dropdownlist control which declared as: id="DropDownList2" runat="server" AutoPostBack="true" onSelectedIndexChanged="ChangeContent", where ChangeContent is a protected method written in C#. The whole thing works and when I change the dropdown selection the required information is displayed correctly but the problem is that instead of displaying everything on the same window it launches a second one which is bigger (where size comes from?) and sits on top of the whole application. Ideally I want it to work similar to windows application where you can change selection and everything happens without reloading the form if this is not possible then at least help me to get rid of the second window.
I would appreciate any contribution.

Janette.

braindead · May 11th, 2006, 03:56 PM

The default behavior of AutoPostBack is to run everything through the same window. My initial thought is that a client-side function is being called at some point in the process that is opening a new window. It could also be happening in the ChangeContent C# function.

Does the new window appear after the original page has posted and redrawn or before?

It is possible to do "asynchronous callbacks", which make the Web application seem to work just like a Windows application. This is an advanced topic, but not out-of-reach. The Wrox Professional ASP.NET 2.0 book has a nice example of this in Chapter 23.

Brandon

janvov · May 12th, 2006, 05:15 AM

Thank you Brendan,

I have actually managed to solve the problem. I have overlooked one small silly thing it was <base target=_self> in the <HEAD> section. When I added it my window started working fine.
But thanks anyway for the reply.

Janette.