JSFiddle - React, Tailwind, and code Playground

HTML

<textarea name="texto"></textarea>
<button id="count">Count</button>

JavaScript

$('#count').on({
    'click': function(){
        var value = $.trim($('[name="texto"]').val()),
            count = value == '' ? 0 : value.split(' ').length;
        alert(count);
    }
});