when clicking inside browse/ ui

browse:35 Uncaught ReferenceError: rapi is not defined
at fortio_load (browse:35:11)
at HTMLSelectElement.onchange (browse:85:67)

because

    fetch(rapi.DataDir+url).then(doc => doc.json()).then((out) => {

instead of previous

    fetch("data/"+url).then(doc => doc.json()).then((out) => {

(because of "const" linter - and no JS 'test')