JSFiddle - React, Tailwind, and code Playground

HTML

<form action = "" method = "post" name = "delete">
    <input type = "hidden" name = "id" value = "1" />
    Логин пользователя: <input type = "text" name = "username" value = "vasia" />
    <input type = "submit" value = "Удалить пользователя" />
</form>
<form action = "" method = "post" name = "delete">
    <input type = "hidden" name = "id" value = "2" />
    Логин пользователя: <input type = "text" name = "username" value = "vasia" />
    <input type = "submit" value = "Удалить пользователя" />
</form>

JavaScript

$("form[name='delete']").submit(function(){
    var id = $(this).find("input[name = 'id']").val();
      alert("Пользователь удалён"+id);
    });