Error 'Can't find a route for GET' on Ajax POST

Every time I submit a form, I get an error Can't find a route for 'get: produk/tambahProduk'.
I have set up routes and ajax with post, why I get that error?

Route.php:

Code:

<?php

use CodeIgniter\Router\RouteCollection;

/**
* @var RouteCollection $routes
*/
$routes->get('/', 'home');
$routes->get('home', 'home');
$routes->get('produk', 'Produk::index');
$routes->get('produk/getProduk', 'Produk::getProduk');
$routes->get('instansi/getInstansi', 'Instansi::getInstansi');
$routes->get('produk/getProdukAll', 'Produk::getProdukAll');
$routes->get('produk/getProdukJenis', 'Produk::getProdukJenis');
$routes->post('produk/tambahProduk', 'Produk::tambahProduk');
// $routes->match(['get', 'post'], 'instansi/getInstansi', 'Instansi::getInstansi');

service('auth')->routes($routes);

AJAX:

Code:

$('#formProduk').submit(function (e) {
    e.preventDefault();
    var method = '';
    var id_produk = $("[name=id_produk]").val();

    if (id_produk == '') {
      method = 'tambah';
    } else {
      method = 'ubah';
    }

    $.ajax({
      url: siteurl + "produk/" + method + "Produk",
      type: "post",
      data: $(this).serialize(),
      dataType: 'json',
      beforeSend: function () {

      },
      complete: function () {

      },
      success: function (response) {
        if (response.error) {
          // $.each(response.error, function (key, value) {
          //  // console.log(key);
          // })
         
          if (response.error.tentang) {$('[name="tentang"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.tentang);}
          else{$('[name="tentang"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}

          if (response.error.nomor) {$('[name="nomor"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.nomor);}
          else{$('[name="nomor"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.tahun) {$('[name="tahun"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.tahun);}
          else{$('[name="tahun"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.jenis_id) {$('[name="jenis_id"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.jenis_id);}
          else{$('[name="jenis_id"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.tempat_penetapan) {$('[name="tempat_penetapan"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.tempat_penetapan);}
          else{$('[name="tempat_penetapan"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.tgl_penetapan) {$('[name="tgl_penetapan"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.tgl_penetapan);}
          else{$('[name="tgl_penetapan"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.tgl_undang) {$('[name="tgl_undang"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.tgl_undang);}
          else{$('[name="tgl_undang"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.bidang) {$('[name="bidang"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.bidang);}
          else{$('[name="bidang"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.sumber) {$('[name="sumber"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.sumber);}
          else{$('[name="sumber"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.pemrakarsa) {$('[name="pemrakarsa"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.pemrakarsa);}
          else{$('[name="pemrakarsa"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.ttd) {$('[name="ttd"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.ttd);}
          else{$('[name="ttd"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.urusan) {$('[name="urusan"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.urusan);}
          else{$('[name="urusan"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.bahasa) {$('[name="bahasa"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.bahasa);}
          else{$('[name="bahasa"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.subjek) {$('[name="subjek"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.subjek);}
          else{$('[name="subjek"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          if (response.error.teu) {$('[name="teu"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.teu);}
          else{$('[name="teu"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
         
          // if (response.error.file) {$('[name="file"]').addClass('is-invalid').nextAll('.invalid-feedback:first').html(response.error.file);}
          // else{$('[name="file"]').removeClass('is-invalid').nextAll('.invalid-feedback:first').html('');}
          console.log('masih eror');
          console.log(response.error);
        }else{
          Swal.fire("Sukses", response.sukses, "success");
          $("#modalFormProduk").modal("hide");
          $("#tb_produk").DataTable().ajax.reload();
          console.log('harusnya bisa');
        }
        // console.log($('[name="nomor"]').val());
      },
      error: function (xhr, ajaxOptions, thrownError) {
        console.log($("[name=produk]").val());
        Swal.fire("Error!", xhr.status + "\n" + xhr.responseText + "\n" + thrownError, "warning");
      },
    }).done(function (resp) {
      // spinner.hide();
    });
  });

Controller:

Code:

function tambahProduk()
{
if ($this->request->isAJAX()) {
$validation = \Config\Services::validation();

$valid = $this->validate([
'jenis_id' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Jenis tidak boleh kosong.']],
'tentang' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Tentang tidak boleh kosong.']],
'nomor' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Nomor tidak boleh kosong.']],
'tahun' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Tahun tidak boleh kosong.']],
'bidang' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Bidang tidak boleh kosong.']],
'tempat_penetapan' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Tempat Penetapan tidak boleh kosong.']],
'tgl_penetapan' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Tanggal Penetapan tidak boleh kosong.']],
'tgl_undang' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Tanggal Pengundangan tidak boleh kosong.']],
'sumber' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Sumber tidak boleh kosong.']],
'pemrakarsa' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Pemrakarsa tidak boleh kosong.']],
'ttd' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Penandatangan tidak boleh kosong.']],
'urusan' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Urusan tidak boleh kosong.']],
'bahasa' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Bahasa tidak boleh kosong.']],
'teu' => ['rules' => 'required', 'errors' => ['required' => 'Kolom T.E.U. tidak boleh kosong.']],
'subjek' => ['rules' => 'required', 'errors' => ['required' => 'Kolom Subjek tidak boleh kosong.']],
]);

if (!$valid) {
$msg = ['error' => [
'jenis_id' => $validation->getError('jenis_id'),
'tentang' => $validation->getError('tentang'),
'nomor' => $validation->getError('nomor'),
'tahun' => $validation->getError('tahun'),
'bidang' => $validation->getError('bidang'),
'tempat_penetapan' => $validation->getError('tempat_penetapan'),
'tgl_penetapan' => $validation->getError('tgl_penetapan'),
'tgl_undang' => $validation->getError('tgl_undang'),
'sumber' => $validation->getError('sumber'),
'pemrakarsa' => $validation->getError('pemrakarsa'),
'ttd' => $validation->getError('ttd'),
'urusan' => $validation->getError('urusan'),
'bahasa' => $validation->getError('bahasa'),
'teu' => $validation->getError('teu'),
'subjek' => $validation->getError('subjek'),
// 'produk' => $validation->getError('produk'),
]];
echo json_encode($msg);
} else {
$file_produk = $this->request->getFile('produk');
$file_produk->move('assets/doc/produk');
$produk = $file_produk->getName();

$dataproduk = [
'jenis_id' => $this->request->getVar('jenis_id'),
'tentang' => $this->request->getVar('tentang'),
'nomor' => $this->request->getVar('nomor'),
'tahun' => $this->request->getVar('tahun'),
'bidang' => $this->request->getVar('bidang'),
'tempat_penetapan' => $this->request->getVar('tempat_penetapan'),
'tgl_penetapan' => $this->request->getVar('tgl_penetapan'),
'tgl_undang' => $this->request->getVar('tgl_undang'),
'sumber' => $this->request->getVar('sumber'),
'pemrakarsa' => $this->request->getVar('pemrakarsa'),
'ttd' => $this->request->getVar('ttd'),
'urusan' => $this->request->getVar('urusan'),
'bahasa' => $this->request->getVar('bahasa'),
'teu' => $this->request->getVar('teu'),
'subjek' => $this->request->getVar('subjek'),
// 'uji_materi' => $this->request->getVar('uji_materi'),
'produk' => $produk,
// 'abstrak' => $this->request->getVar('abstrak'),
// 'status' => $this->request->getVar('status'),
];

$this->p->insert($dataproduk);
$msg = [
'sukses' => 'Data berhasil disimpan.'
];

echo json_encode($msg);
}
} else {
exit('Maaf tidak dapat diproses');
}
}

Form:

Code:

<form method="POST" id="formProduk" enctype="multipart/form-data">
<?= csrf_field() ?>
<input type="text" id="id_produk" name="id_produk" style="display: none">
<div class="row gy-2">
<div class="col-md-4">
<div class="form-group">
<label class="form-label" for="tentang">Tentang</label>
<div class="form-control-wrap">
<textarea class="form-control no-resize" name="tentang" placeholder="Tentang"></textarea>
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-md-8">
<div class="row gy-2">
<div class="col-md-4">
<div class="form-group">
<label class="form-label" for="nomor">Nomor</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="nomor" placeholder="Nomor">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="form-group">
<label class="form-label" for="tahun">Tahun</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="tahun" placeholder="Tahun">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="form-group">
<label class="form-label" for="jenis_id">Jenis</label>
<div class="form-control-wrap ">
<div class="form-control-select">
<select class="select-produk-jenis" name="jenis_id" placeholder="Pilih Jenis Produk">
</select>
<div class="invalid-feedback"></div>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="form-group">
<label class="form-label" for="tempat_penetapan">Tempat Penetapan</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="tempat_penetapan" value="Pekalongan" placeholder="Tempat Penetapan">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="form-group">
<label class="form-label">Tanggal Penetapan</label>
<div class="form-control-wrap">
<div class="form-icon form-icon-left">
<em class="icon ni ni-calendar"></em>
</div>
<input type="text" class="form-control date-picker" name="tgl_penetapan" data-date-format="dd-mm-yyyy" placeholder="Tanggal Penetapan" autocomplete="off">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="form-group">
<label class="form-label">Tanggal Pengundangan</label>
<div class="form-control-wrap">
<div class="form-icon form-icon-left">
<em class="icon ni ni-calendar"></em>
</div>
<input type="text" class="form-control date-picker" name="tgl_undang" data-date-format="dd-mm-yyyy" placeholder="Tanggal Pengundangan" autocomplete="off">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<div class="row gy-2">
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="bidang">Bidang</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="bidang" placeholder="Bidang">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="sumber">Sumber</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="sumber" placeholder="Sumber">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="pemrakarsa">Pemrakarsa</label>
<div class="form-control-wrap ">
<div class="form-control-select">
<select class="select-instansi" name="pemrakarsa" placeholder="Pilih Instansi">
</select>
<div class="invalid-feedback"></div>
</div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="ttd">Penandatangan</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="ttd" placeholder="Penandatangan">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="urusan">Urusan</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="urusan" placeholder="Urusan">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="bahasa">Bahasa</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="bahasa" value="Indonesia" placeholder="Bahasa">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="subjek">Subjek</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="subjek" placeholder="Subjek">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="teu">T.E.U.</label>
<div class="form-control-wrap">
<input type="text" class="form-control" name="teu" placeholder="Tajuk Entry Utama">
<div class="invalid-feedback"></div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="uji_materi">Uji Materi</label>
<div class="form-control-wrap">
<div class="form-file">
<input type="file" class="form-file-input" name="uji_materi">
<label class="form-file-label" for="uji_materi">Pilih berkas</label>
<input type="text" class="form-control" name="uji_materis" placeholder="Belum ada berkas." disabled>
</div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="abstrak">Abstrak</label>
<div class="form-control-wrap">
<div class="form-file">
<input type="file" class="form-file-input" name="abstrak">
<label class="form-file-label" for="abstrak">Pilih berkas</label>
<input type="text" class="form-control" name="abstraks" placeholder="Belum ada berkas." disabled>
</div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="file">File Produk</label>
<div class="form-control-wrap">
<div class="form-file">
<input type="file" class="form-file-input" name="produk">
<label class="form-file-label" for="produk">Pilih berkas</label>
<input type="text" class="form-control" name="produks" placeholder="Belum ada berkas." disabled>
<div class="invalid-feedback"></div>
</div>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="status_akhir">Status</label>
<div class="form-control-wrap ">
<div class="form-control-select">
<select class="select-biasa" name="status_akhir">
<option value="Berlaku">Berlaku</option>
<option value="Tidak Berlaku">Tidak Berlaku</option>
</select>
</div>
</div>
</div>
</div>
</div>
<br>
<div id="ket_status" class="row gy-2">
<?php for ($i = 0; $i < 8; $i++) { ?>
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="status">Keterangan Status</label>
<div class="form-control-wrap ">
<div class="form-control-select">
<select class="select-biasa" name="status[]" placeholder="Pilih Keterangan Status">
<option value=""></option>
<option value="Mencabut">Mencabut</option>
<option value="Dicabut">Dicabut</option>
<option value="Mengubah">Mengubah</option>
<option value="Diubah">Diubah</option>
</select>
</div>
<div class="form-control-select">
<select class="select-produk" name="status_id[]" placeholder="Pilih Produk">
</select>
</div>
</div>
</div>
</div>
<?php } ?>
</div>
<br>
<div class="row gy-2">
<div class="col-sm-3">
<div class="form-group">
<label class="form-label" for="catatan">Catatan</label>
<div class="form-control-wrap">
<textarea class="form-control no-resize" name="catatan" placeholder="Catatan"></textarea>
</div>
</div>
</div>
</div>
<br>
<div class="row gy-2">
<div class="col-sm-12" align="right">
<button type="submit" class="btn btn-primary" id="btnTambahProduk">Simpan</button>
<button type="submit" class="btn btn-primary" id="btnUbahProduk">Simpan</button>
<button type="button" class="btn btn-danger" id="btnBatalProduk" data-bs-dismiss="modal">Batal</button>
</div>
</div>
</form>

Thanks in advance.

Frist, comfirm routes:
https://codeigniter4.github.io/CodeIgnit...ing-routes

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

Frist, comfirm routes:
https://codeigniter4.github.io/CodeIgnit...ing-routes

this is the result

Code:

+--------+-------------------------+--------------------+--------------------------------------------------------------------+----------------+---------------+
| Method | Route                  | Name              | Handler                                                            | Before Filters | After Filters |
+--------+-------------------------+--------------------+--------------------------------------------------------------------+----------------+---------------+
| GET    | /                      | »                  | \App\Controllers\home                                              | session        | toolbar      |
| GET    | home                    | »                  | \App\Controllers\home                                              | session        | toolbar      |
| GET    | produk                  | »                  | \App\Controllers\Produk::index                                    | session        | toolbar      |
| GET    | produk/getProduk        | »                  | \App\Controllers\Produk::getProduk                                | session        | toolbar      |
| GET    | instansi/getInstansi    | »                  | \App\Controllers\Instansi::getInstansi                            | session        | toolbar      |
| GET    | produk/getProdukAll    | »                  | \App\Controllers\Produk::getProdukAll                              | session        | toolbar      |
| GET    | produk/getProdukJenis  | »                  | \App\Controllers\Produk::getProdukJenis                            | session        | toolbar      |
| GET    | register                | »                  | \CodeIgniter\Shield\Controllers\RegisterController::registerView  | session        | toolbar      |
| GET    | login                  | »                  | \CodeIgniter\Shield\Controllers\LoginController::loginView        |                | toolbar      |
| GET    | login/magic-link        | magic-link        | \CodeIgniter\Shield\Controllers\MagicLinkController::loginView    |                | toolbar      |
| GET    | login/verify-magic-link | verify-magic-link  | \CodeIgniter\Shield\Controllers\MagicLinkController::verify        |                | toolbar      |
| GET    | logout                  | »                  | \CodeIgniter\Shield\Controllers\LoginController::logoutAction      | session        | toolbar      |
| GET    | auth/a/show            | auth-action-show  | \CodeIgniter\Shield\Controllers\ActionController::show            |                | toolbar      |
| POST  | produk/tambahProduk    | »                  | \App\Controllers\Produk::tambahProduk                              | session        | toolbar      |
| POST  | register                | »                  | \CodeIgniter\Shield\Controllers\RegisterController::registerAction | session        | toolbar      |
| POST  | login                  | »                  | \CodeIgniter\Shield\Controllers\LoginController::loginAction      |                | toolbar      |
| POST  | login/magic-link        | »                  | \CodeIgniter\Shield\Controllers\MagicLinkController::loginAction  |                | toolbar      |
| POST  | auth/a/handle          | auth-action-handle | \CodeIgniter\Shield\Controllers\ActionController::handle          |                | toolbar      |
| POST  | auth/a/verify          | auth-action-verify | \CodeIgniter\Shield\Controllers\ActionController::verify          |                | toolbar      |
+--------+-------------------------+--------------------+--------------------------------------------------------------------+----------------+---------------+

You don't have the route `GET produk/tambahProduk`.

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

You don't have the route `GET produk/tambahProduk`.

I use POST for the form, why should I have GET route?
I've tried replacing my POST route to GET, the form can run but does not save to the database

I use POST for the form, why should I have GET route?

Because you request it. If it is really not needed, your JavaScript seems to send unneeded GET request.

I've tried replacing my POST route to GET, the form can run but does not save to the database

Because you removed the POST route.

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

I think you want the JavaScript to look like this:

PHP Code:

    $.ajax({
      url: siteurl + "produk/" + method + "Produk",
      method: "POST", 


'method' not 'type'. I'm not sure if POST needs to be all caps or not but that's what I'm using.
Hope that helps.