JSFiddle - React, Tailwind, and code Playground

by Salustiano Silva

HTML

<select id="CC" multiple="multiple">
    <option value="1">Valor 1</option>   
    <option value="2">Valor 2</option>
    <option value="3">Valor 3</option>
    <option value="4">Valor 4</option>
</select>

JavaScript

$(document).ready(function(){
    $(document).on("click", '#CC', function (e) {  // click na select
        var $opt = $(this).find(":selected");      // apanha option que recebeu click
        alert($opt.attr("value"));                 // alert do seu valor
        $opt.attr("selected", false);              // remove selecçao
        e.preventDefault();
    }); 
});