JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<label for="txtName">Name</label>
<input type="text" id="txtName" class="form-control" name="txtName">
</div>

<div>
<label for="txtEmail">E-mail</label>
<input type="text" id="txtEmail" class="form-control" name="txtEmail">
</div>

JavaScript

$('input').each(function(){
 if ($(this).val() == '') {

 $element = $(this)

 var $label = $("label[for='"+$element.attr('id')+"']")

 alert($label)    

 }

 });