JSFiddle - React, Tailwind, and code Playground

HTML

<select class="chosen" style="width:400px;">
	<option>Choose...</option>
	<option>jQuery</option>
	<option>MooTools</option>
	<option>Prototype</option>
	<option selected="selected">Dojo Toolkit</option>
</select>

JavaScript

$(document).ready(function(){
    
    var previous;

    $(".chosen").one('focus', function () {
        // Store the current value on focus and on change
        previous = this.value;
    }).change(function() {
        // Do something with the previous value after the change
         console.log(previous);

        // Make sure the previous value is updated
        previous = this.value;
    });
    
    
    //console.log($(".chosen  option:not(:selected)").last().val());
});