$F gets the value of a form element, not the element itself. You're feeding
a string into that function, and strings don't have the getElementsByTagName
method.
Use $ instead.
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Updater expects the return result to be (X)HTML. It drops the response
directly into the container as is. You should be returning an HTML string,
or using Ajax.Request to get the JSON, convert it into HTML and dropping it
in place.
If you want to be hackish about it, you do your converting in
try using Ajax.Request
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