JSFiddle - React, Tailwind, and code Playground

HTML

<select id="attributeNames" name="attributeNames" size="5" multiple="multiple"        >
<option value="Apple"> Apple </option>
<option value="Mango"> Mango </option>
<option value="Orange"> Orange </option>
<option value="Banana"> Banana </option>                                            
</select>

JavaScript

var d = document.getElementById('attributeNames');
d.onchange = function () {
    for(var index = 0; index < this.children.length; index++) {        
        if (this.children[index].selected) {
            console.log(this.children[index].value);
        }            
    }
}