JAVASCRIPT

js poll dom

function pollDOM () {
  const el = document.querySelector('my-element');

  if (el.length) {
    // Do something with el
  } else {
    setTimeout(pollDOM, 300); // try again in 300 milliseconds
  }
}

pollDOM();

poll in javascript

const poll = async function (fn, fnCondition, ms) {
  let result = await fn();
  while (fnCondition(result)) {
    await wait(ms);
    result = await fn();
  }
  return result;
};

const wait = function (ms = 1000) {
  return new Promise(resolve => {
    setTimeout(resolve, ms);
  });
};

let fetchReport = () => axios.get(reportUrl);
let validate = result => !result.data.summary;
let response = await poll(fetchReport, validate, 3000);