urlQueryFieldView (rw view interface to the URL parameters)

Show and Tell
4

ok when I actually got into details, the URL Input.bind would overwrite the UI control with undefined if the URL was not specified, but we don;t want to override with undefined results (e.g. we prefer a local storage fallback). So I had to use bindOneWay from view instead, that could be upgraded to do a bind only for defined values.

viewof url = bindOneWay(
  Inputs.bind(
    Inputs.text({ label: "url" }),
    localStorageView("url")
  ),
  urlQueryFieldView("url"),
  { onlyDefined: true }
)