JSFiddle - React, Tailwind, and code Playground

HTML

<form id="myform">
    <input type="checkbox" name="check1" value="check1" onClick="cbChanged(this);" />
    <input type="checkbox" name="check2" value="check2" onClick="cbChanged(this);" />
</form>

JavaScript

cbChanged = function(checkboxElem) {
  if (checkboxElem.checked) {
    alert("That box was checked.");
  } else {
    alert("That box was unchecked.");
  }
}