Fungsi simpan tidak berfungsi

di form tambah data fungsi simpan nya tidak berfungsi tombol di klik tapi tidak terjadi apa2.

modal

<div id="modal-tambah" class="modal fade" role="dialog">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<form role="form" id="form-tambah" method="post" action="input.php">
<div class="modal-header">
<h4 class="modal-title">Menambahkan Group</h4>
</div>
<div class="modal-body">
<div class="form-group">
<label>Id</label>
<input class="form-control" id="id" name="id">
<p style="color:red" id="error_id"></p>
</div>
<div class="form-group">
<label>Nama Grup</label>
<input class="form-control" id="grup" name="grup">
<p style="color:red" id="error_grup"></p>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-info" data-dismiss="modal">Batal</button>
<button type="submit" class="btn btn-primary" >Simpan</button>
					</div>
				</form>
			</div>
		</div>
	</div>

input.php

<?php

include"koneksi.php";

$id = $_POST['id'];
$nama = $_POST['grup'];

if ($id == ' ') {
    $data['error']['id'] = 'Id tidak boleh kosong';
}
if ($nama == ' ') {
    $data['error']['grup'] = 'Masukan nama grup';
}
if (empty($data['error'])) {
$query = "insert INTO grup SET
id_grp = '$id',									nama_grup = '$nama'";
mssql_query($query)
or die ("Gagal Perintah SQL".mssql_error());
$data['hasil'] = 'sukses';
} else {
$data['hasil'] = 'gagal';
}
echo json_encode($data);
?>

script.js

$(document).ready(function(){
	var data = "data.php";
	$('#data-grup').load(data);

	$("#form-tambah").submit(function(e) {
		e.preventDefault();

		$("#error_id").html('');
		$("#error_grup").html('');


		var dataform = $("#form-tambah").serialize();
		$.ajax({
			url: "input.php",
			type: "post",
			data: dataform,
			success: function(result) {
				var hasil = JSON.parse(result);
				if (hasil.hasil !== "sukses") {
					$("#error_id").html(hasil.error.id);
					$("#error_grup").html(hasil.error.grup);

				} else {
					$('#modal-tambah').modal('hide');
					$("#id").val('');
					$("#grup").val('');
					$('#data-grup').load(data);
				}
			}
		});
	});

	$(document).on('click','#edit',function(e){
		e.preventDefault();
		$("#modal-edit").modal('show');
		$.post('edit.php',
			{id:$(this).attr('data-id')},
			function(html){
				$("#data-edit").html(html);
	}
		);
	});
});

data.php

<table class="table table-bordered">
<tr>
<th>
No
</th>
<th>
Nama Grup
</th>
<th>
Opsi
</th>
</tr>
<?php
include"koneksi.php";
$no = 1;
$data = mssql_query (" select  id_grp, nama_grup from  grup order by id_grp DESC");
 while ($row = mssql_fetch_array ($data)){
?>
<tr>
<td>
<?php echo $row['id_grp']; ?>
</td>
<td>
<?php echo $row['nama_grup']; ?>
</td>
<td>
<a href="#" id="edit" data-id="<?php echo $row['id_mahasiswa']; ?>">Edit</a> |
<a href="#" id="hapus" data-id="<?php echo $row['id_mahasiswa']; ?>">Hapus</a>
			</td>
		</tr>
		<?php
			}
		?>
	</table>