Yii2: How to send new variable from view to controller?

Question

I have a table called persons with id and name fields.

I have a create.php view that loads the model called Persons and now I want to add a checkbox called hasCar to show if a person has a car (so it is a boolean condition).

Then I have the send button that send the $model array of the form to the controller so I need to add the hasCar variable to $model array.

But the checkbox is not a column of the persons table so I got some errors because it is not part of the model.

I added the checkbox in this way but it is not working, of course.

<?= $form->field($model, 'hasCar')->checkbox(); ?>

Is it possible to send the hasCar variable inside the $model array? I mean, how can I send the hasCar variable to the controller when the send button is pressed?

Possible duplicate of Add custom field in the view of yii2 which is not in model — Patrick
– Patrick, Commented Sep 10, 2017 at 17:52

Fabrizio Caldarelli · Accepted Answer · 2017-09-10 18:05:30Z

2

Create a new model extending Person that contains hasCar member, and load the model from PersonForm class, such as:

class PersonForm extends Person
{
    public $hasCar;

    public function rules()
    {
        return array_merge(parent::rules(), [
            [['hasCar'], 'safe'],
        ]);
    }   

    public function attributeLabels()
    {
        return array_merge(parent::attributeLabels(), [
            'hasCar' => 'Has car',
        ]);
    }      
}

answered Sep 10, 2017 at 18:05

Fabrizio Caldarelli

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Comments

Damian · Accepted Answer · 2017-09-11 06:32:13Z

1

You can't pass the variable to the $model object orbit is affiliated with a db table, you are right about this. You need to pass the variable to the controller via a request method (GET, POST).

Try :

Yii::$app->request->post()

for POST, and :

Yii::$app->request->get()

for GET.

Also on the form add the checkbox as an HTML class component.

EXAMPLE:

CONTROLLER:

...
$hasCar = Yii::$app->request->post('hasCar');
....

VIEW:

...
// We use ActiveFormJS here
$this->registerJs(
    $('#my-form').on('beforeSubmit', function (e) {
        if (typeof $('#hasCar-checkbox').prop('value') !== 'undefined') {
            return false; // false to cancel submit
        }
    return true; // true to continue submit
});
$this::POS_READY,
'form-before-submit-handler'
);
...
<?= HTML::checkbox('hasCar', false, ['id' => 'hasCar-checkbox', 'class' => 'form-control']) ?>
...

More on ActiveFormJS: enter link description here

I hope this answer covered you.

Damian

edited Sep 11, 2017 at 6:32

answered Sep 10, 2017 at 18:13

Damian

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2 Comments

Roby Sottini Over a year ago

The hasCar variable should be required. How can I validate it? I can do it in the model file but I would like to not use the model.

Damian Over a year ago

You cannot use the backend validation. Yii2 has a known bug regarding this issue and it is not yet solved. You can use frontend validation. At least that is how i do it. You first attach a handler to the activeform submit event. I will update my answer with an example.

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