<form  id="add"  action="" onsubmit="return false;">
    <input type="text" name="add" required>
    <button type="submit" name="submit" onclick="add('#add')" value="1">Ekle</button>
   </form>

    function add(formId){
	var data = $(formId).serialize();
	$.post("add.php", data, function (response) {
		if (response.error){
			swal("!", response.error, "error");
		} else {
			swal("Tebrikler", response.success, "success");
		}
	}, "json");
}