I would like a way to filter the fields displayed in a popup by certain attributes. For example, if I have a Farmers Market dataset that I want to show links to their websites in a popup. If 9 out of the 10 have information in the websites field, I'd like to only show the field when it has information in it. The one that doesn't have a website, I'd like to hide the website field and not display it in the popup window.
This idea has been merged with Web Maps: configurable pop-up conditional formatting.