Identify the mechanism for toggling the display of form fields

[waldoj]

Normally we'd just use some external JavaScript to accomplish this, but JSON Form has a hook for this, which I imagine is because it's problematic or impractical to attempt to make changes to the DOM when it's already been rendered by JSON Form. Figure out how to get this working (my efforts failed, because dropping JavaScript straight into JSON makes no sense).

[waldoj]

This is clearly documented as an existing thing, but when I try it, $.get("{{site.baseurl}}/javascripts/form.json"); fails, presumably because it's not well-formed JSON.