JSFiddle - React, Tailwind, and code Playground

HTML

<div id="block">
  bla-bla-bla
  <form>
    <input type="text" name="i1" value="val1">
    <input type="text" name="i2" value="val2">
    <input type="text" name="i3" value="val3">
    <input type="submit" name="submit" value="send" id="send">
  </form>
</div>

JavaScript

console.clear();
$('#send').click(function () {
	var data = $('form').serialize();
  data += '&block=' + $('#block').text();
	alert(data);
});