Hi Guys

Could someone give me advise on how you program 3 related dropdown lists.

I need to design a Country, Region, Resort DDL's

My Example is If Someone Select USA from the Country DDL the Region DDL would be active and would display the US States then a State Like Florida was select the Resort DDl would now be active and would display Resorts Like Orlando etc.

The data in each ddl is pulled from a db and each region has a foriegn key to the country table and resort the region table etc.

Any Help (VB) would be useful.

Thanks.

James

check out my free ListLink control.

Hi,
First you have to set AutoPostBack property of the all three dropdown to true
Now first you have to fill the country dropdown from the database and two other dropdown blank. note that you have to bind country dropdown in condition when there is no postback

There after when user select any country from the dropdown you have to fill region dropdown, in the SelectedIndexChanged event of the country dropdown.

Same thing you have to do for the Resort drop down. fill the Resort dropdown in the SelectedIndexChanged event of the Region dropdown.

I hope that you have got some idea about implementing three related dropdown.

Regards

Hi Andy. I know how to make 3 related drop down lists without a problem. However i'm interested to know how hard it is to make them dynamic without having a postback. IE - Using Javascript layers? I like how your example page using your ListLink control works - but want to code this myself if possible.

Did you custom write Javascript to get this working, or does .NET having something inbuilt that i can look into further?

Thanks!

I provide the complete source code to my controls in the download. Download the control and to see everythign I do to create the effect.

Sweet, thanks Andy. In the end i've implemented your control. No point in re-inventing the wheel. Besides, i'm VB - not C#. I'm sure i could look at the code and understand it, but time is money at the moment. =)

I do have a quick question for you - is there an easy way for me to add a default option on one of my child dropdownlists? IE - at the top i'd want it to say "Please Select Your Model" and that way i could have it autopostback'ing once the user had selected the appropriate child dropdown.. ? At the moment i've got a "GO" button because i couldn't seem to get the default option stuck in there using normal means.

Thanks!