/Html/How to call a function when dropdown menu's value is selected in html

How to call a function when dropdown menu's value is selected in html

var menu = document.getElementById("change_chart");
menu.addEventListener("change", generateData);

function generateData(event) {
  if (menu.value == '1') {
    alert(1);
  } else if (menu.value == '2') {
    alert(2);
  } else if (menu.value == '3') {
    alert(3);
  }
}

Source: stackoverflow.com

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