JSFiddle - React, Tailwind, and code Playground
HTML
<textarea id="foo" value=""></textarea><br/>
<input id="bar" value="" type ="text" /><br/>
<input id="check" value="test" type ="button" /><br/>
<span id="res"></span>
JavaScript
$( function(){
$('#check').on('click', function(){
$('#res').html( "textarea vide => " +$("#foo[value='']").length + "<br/>input vide => " + $("#bar[value='']").length);
});
})