create an date picker in javascript

<input type="text" id="datepicker">
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#datepicker {
  font-size: 14px;
  padding: 5px;
  border: none;
  border-bottom: 1px solid #ccc;
}
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index.tsx
var datepicker = document.getElementById('datepicker');

datepicker.addEventListener('focus', function() {
  var datepicker = new Datepicker({
    maxDate: new Date()
  });
  datepicker.onSelect = function(date) {
    datepicker.hide();
    datepicker.value = formatDate(date);
  };
  datepicker.show();
});

function formatDate(date) {
  var day = date.getDate();
  var month = date.getMonth() + 1;
  var year = date.getFullYear();
  return year + '-' + month + '-' + day;
}
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