5 Cascading Dropdowns (Parent to Child and Child to Parent)

[Marknut]

Simple and blunt: my cascading dropdownlists clear when a postback occurs. Does anyone know a quick way around that?

For more information, read on...

I have 5 dropdown lists that define a training class location and line of business: Site, Parent Client, Client, Program, Project.

I'm trying to build cascading dropdownlists that can work from any direction (i.e. select a site and all other lists are filtered by site...select a project and all other dropdown lists are filtered by project). I've built the SQL Select statement behind the lists that filters (accurately).

[Frinavale]

Are you calling the DropDownList's DataBind method (or otherwise re-populating the lists) in the Page Load method?

[Marknut]

No, but all of the dropdowns have autopostback set to true so they will databind once another dropdown has changed.

[Marknut]

Answer

I just wanted to post an answer.

1. I dimed public variables
2. Set those variables as the dropdownlist.se lectedvalues on page_load (If ispostback then...)
3. Set the dropdownlist.se lectedvalue as the variables on the ddl databound