find and id in javascript after openig popup with a context

when a popup is opened with a context (that contains a parent id) i need to be able to get that id from the context in a snippet in a table header on the popup do i use {{}} ?

What do you mean by “in a snippet in a table header”?

In javascript, you should probably just use the skuid model api to get to the data.
Depending on how you’re launching your snippet, it will probably have arguments[0].context, which you could also use to get the id you’re looking for.