Codeigniter4 form validation

Question

I'm porting my application from CI3 to CI4.

Having issues with the form validation. My goal is to validate the input only if the form is submitted. In Codeigniter 3 a could do:

$this->load->library('form_validation');
$this->form_validation->set_rules('username', 'Username', 'required');
if ($this->form_validation->run()) {
    $username = $this->input->post('username');
    ...
} else {
    ...
}

And then it my view, I could display my errors:

echo validation_errors();

or display an error individually:

echo form_error('username');

All the errors would be displayed if the form was submitted. When I visit the page for the first time, no errors are shown.

Now in Codeigniter 4:

My controller is set up like this:

$validation =  \Config\Services::validation();

$validation->setRule('username', 'Username', 'required|min_length[6]');
if ($validation->withRequest($this->request)->run()) {
    $username = $this->request->getVar('username');
    ...
} else {
    ...
}

The validation is working, but the errors are displayed always. Even when the form is not submitted.

Answer 1

Make sure you are only validating upon a 'post' request. You can utilize $this->request->getMethod() inside a controller to check what type of request it is.

You can do something like this:

if($this->request->getMethod() == 'post')
{
  // Validation
}