JSFiddle - React, Tailwind, and code Playground

HTML

<select id="select1" name="select" class="drop">
   <option name="option" value="Option 1"></option>
</select>

<select id="select2" name="select" class="drop">
   <option name="option" value="Option 1"></option>
   <option name="option" value="Option 2"></option>
   <option name="option" value="Option 3"></option>
</select>

<span class="date_number"/>

JavaScript

$(function() {
    $(".date_number").text($(".drop:last option").length + " items")
});