flags/assets/docs.js

const loadJSON = (path, callback) => {
  var xobj = new XMLHttpRequest();
  xobj.overrideMimeType('application/json');
  xobj.open('GET', path, true);
  xobj.onreadystatechange = function () {
    if (xobj.readyState == 4 && xobj.status == '200') {
      callback(xobj.responseText);
    }
  };
  xobj.send(null);
};

const addFlag = (country, rowDiv) => {
  const colDiv = document.createElement('div');
  colDiv.classList.add('col-xl-2');
  colDiv.classList.add('col-lg-3');
  colDiv.classList.add('col-md-4');
  colDiv.classList.add('col-6');
  const flagDiv = document.createElement('div');
  flagDiv.classList.add('flag');

  // Code
  const codeSpan = document.createElement('span');
  codeSpan.classList.add('flag-code');
  const code = document.createTextNode(country.code);
  codeSpan.appendChild(code);

  //Country
  const countryDiv = document.createElement('div');
  countryDiv.classList.add('flag-country');
  countryDiv.classList.add('no-wrap');
  countryDiv.title = country.name;
  const countryName = document.createTextNode(country.name);
  countryDiv.appendChild(codeSpan);
  countryDiv.appendChild(countryName);
  const flagImg = document.createElement('img');
  flagImg.classList.add('flag-img');
  flagImg.src = country.flag_4x3;
  flagImg.alt = `Flag of ${country.name}`;

  colDiv.appendChild(flagDiv);
  flagDiv.appendChild(countryDiv);
  flagDiv.appendChild(flagImg);
  rowDiv.appendChild(colDiv);
};

window.onload = function () {
  const isoFlagsRow = document.getElementById('iso-flags');
  const nonIsoFlagsRow = document.getElementById('non-iso-flags');
  loadJSON('country.json', response => {
    const countries = JSON.parse(response);
    for (country of countries) {
      console.log(country);
      if (country.iso) {
        addFlag(country, isoFlagsRow);
      } else {
        addFlag(country, nonIsoFlagsRow);
      }
    }
  });
};