$( "#form" ).on( "submit", function( event ) {
event.preventDefault();
jQuery.ajax({
type: "GET",
url: "/send.php",
data: jQuery("#form").serialize(),
success: function(html) {
jQuery("body").empty();
jQuery("body").append("Ваше сообщение успешно отправлено.");
}
});
});background: none; $(document).on("submit", "#form", function(e){
e.preventDefault();
alert("Эврика!");
});<div id="Todos">
<h2>Семья</h2><table>
<tbody><tr>
<form class="edit_todo" id="edit_todo_1" action="/todos/1" accept-charset="UTF-8" method="post"></form>
<input name="utf8" type="hidden" value="✓"><input type="hidden" name="_method" value="patch">
<input type="hidden" name="authenticity_token" value="W19BuAtSKynbPBlmIGg77Z7r72LTxWDleFZQiETlkWWsY7JoByjgG+xR84ruG1sjsJXSrKfptYVU4IRhw5VLYQJ==">
<td>Купить молоко</td>
<td><input name="todo[isCompleted]" type="hidden" value="0">
<input type="checkbox" value="1" name="todo[isCompleted]" id="todo_isCompleted">
</td>
</tr>
</tbody></table></div>