Populate a Dropdown Based on the Value of Another Dropdown in PowerApps

If you’re new to PowerApps, be sure to read my brief introduction to PowerApps HERE

In this session, I’ll show you how to setup a series of drop-down menus were the list of available values is based on the value selected in the first dropdown

Start by creating a new screen, and creating a Connection to a Data Source which contains your list of available value combinations

Content à Data Sources

Add Data Source

Select your Connection (or create a new one)

Select the table(s) containing your values. Ensure your table has a Primary Key

And Connect

My table has three fields

ID | ParentReason | ChildReason

Back on your PowerApps Screen, add a dropdown menu

Insert à Controls à Drop Down

Give your Dropdown a more meaningful name. Select the Content tab, select ‘Dropdown1’ (or similar) and rename.

I named mine ParentReasonDrop

Set the Items Parameter to select the relevant list of Parent Values from your table. In my case, I needed to specify DISTINCT values

Distinct('[dbo].[ReasonCodes]',ParentReason)

Now, add a second Dropdown menu, and give it a name – I went with ChildReasonDrop

For this one, set the Item parameter to bring back a dataset filtered based on the value of ParentReasonDrop

Filter('[dbo].[ReasonCodes]',ParentReasonDrop.Selected.Value in ParentReason)

So here, we’re filtering the ReasonCodes table, where the ParentReason matches the selected value in ParentReasonDrop.

And that’s all there is to do – and of course you can continue with multiple sub-menus if you so wish.