JSFiddle - React, Tailwind, and code Playground

HTML

<form id="uploadForm" action="whatever" method="post">
  <input type="text" name="inputText">
  <input type="submit" value="Upload PDF" class="btn btn-primary" />
</form>

JavaScript

$('#uploadForm').submit(function(e) {
	e.preventDefault();
	$.ajax({
		url: '/echo/json/',
  	data: $(this).serialize(),
    type: 'POST',
  	success: function(data) {
  		alert(data);
  	}
	});
});