使用 CodeIgniter 表单验证的自定义错误消息

Question

I want to make some custom error messages in my CodeIgniter forms. I've tried using

$this->form_validation->set_message('is_unique[users.username]', 'The username is already taken');

However I can't get it working.

Editing the form_validation_lang.php file is not good enough, as is_unique will be The username is already taken for usernames, and The e-mail is already registered for mails.

How can I make this custom error message?

Here's a snippet from my code:

$this->form_validation->set_message('is_unique[users.username]', 'The username is already taken');

// Check if username has changed
if ($this->input->post('username') !== $user->username) {
    $this->form_validation->set_rules('username', 'Username', 'trim|required|min_length[4]|max_length[20]|is_unique[users.username]');
}

Answer 1

Right way of doing this is by passing a string format

$this->form_validation->set_message('is_unique', 'The %s is already taken');

So, then only we can able to get message like "This Username is already taken" or "This Email is already taken" .

Answer 2

这对我有用

$this->form_validation->set_message('is_unique', 'The username is already taken');

Answer 3

It's better you use like this:

$this->form_validation->set_message('is_unique', 'The %s is already taken');

The form_validation changes %s with the label seted for the field.

Hope this helps!

Answer 4

这是您仅为用户名设置消息错误的方法：

$this->form_validation->set_rules('username','Username','is_unique',array('is_unique' => 'The %s is already taken'));

Answer 5

you can add your custom message to validation_errors() string after checking validation using $this->form_validation->run() == true

if(YOUR_CONDITION){
   $this->form_validation->run();
   $err = validation_errors();
   $err = $err. '<p>Custom validation error message</p>'. PHP_EOL;
   $data['err'] = $err;
   $this->load->view('viewname', $data);
}
else if ($this->form_validation->run() == true ) {
        #code...
}
else..

after setting your custom message to $err variable, print it on your view.

Answer 6

create a **form_validation.php** file and use this method:

"add_user_rule"   => [
    [
        "field" => "username",
        "label" => "Username",
        "rules" => "required|trim|is_unique[users.username]",
        "errors" => [
            'is_unique' => 'The %s is already taken.',
        ],
    ],
],

Thank You

Answer 7

You can pass the third parameter to set messages for the validation

$this->form_validation->set_rules(
        'username', 'Username',
        'required|min_length[5]|max_length[12]|is_unique[users.username]',
        array(
                'required'      => 'You have not provided %s.',
                'is_unique'     => 'This %s already exists.'
        )
);

Check here

Answer 8

You need to refer to the name of the field and not the rule.

The docs are slightly confusing in that they also name it 'required'.

So where you have $this->form_validation->set_message('is_unique[users.username]', 'The username is already taken');

It should be

$this->form_validation->set_message('username', 'The username is already taken');

Hope this helps!