JSFiddle - React, Tailwind, and code Playground

by Pradeep Shankar

HTML

<span id="mysel">
    <select id="select" onchange="test();">
    <option value="1">1</option>
     <option value="2">2</option>
     <option value="3">3</option>
     <option value="4">4</option>
     <option value="5">5</option>
</select>
</span>

JavaScript

var myList = [1,2,3,4,5];

function test() {
    
var e = document.getElementById("mysel").children[0];
var val = e.options[e.selectedIndex].value;
    var index = myList.indexOf(parseInt(val));
    alert(index);
}