JSFiddle - React, Tailwind, and code Playground

by Znuff

HTML

<h4>Test</h4>

JavaScript

let $key = 1;
let $domainName = $('h4').addClass('domainTitle');
let $button = $domainName.append(' <button class="btn btn-sm btn-link" data-copyto="domainfield[' + $key + ']"><i class="fal fa-copy fa-fw"></i>Folosește datele de mai sus</button>');

$button.on('click', function() { copyDataToForm( $(this) ); console.log($(this)); } );

function copyDataToForm(data) {
  console.log(data);
}