JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" class="but" id="42" value="Удалить" />

JavaScript

$('.but').on('click', function() {
  $.ajax({
    type: "POST",
    url: "delete.php",
    data: { fname: this.id },
    success: function() {
      $(this).remove();
    },
  })
})