Using a taxonomy select field as a contextual filter for an Entity Reference View powered select box I've got a parent child relationship between two content types: Properties and Parks. They are organized into a taxonomy we'll call Market. When creating a Park you select the Market it belongs to. Then creating a Property (which is child to a Park) you also select the Market and then select the Park it should be a child of. I need the select list of Parks (which is an Entity Reference) to filter based on what Market is selected to only show Parks from that Market. I have created an Entity Reference View properly and am able to see it filtering properly in the preview. But how can I use the data from the first select box for Market (a Term reference select list) to power the contextual filter of the second select box for Parks (an Entity Reference select list with the Entity selection set to filter by Entity Reference View).

I'm not sure if this is even possible, but have been stuck on it for a while.
I was able to find a workaround to this and display the market (taxonomy) and park (parent) in a select list from a view. Then wrote some javascript to disable the options that are irrelevant (parks from other markets) once the user selects the market of the property.