How to know the active dropDownList in yii2

[Burma]

It is necessary that, depending on the element chosen in dropDownList, the next field - if string, we remove the text field if the image is fileInput That's the leaf code.

<?= $form->field($model, 'type')->dropDownList([
    'string' => 'string',
    'image' => 'image',
]);

Trying to do that, but it doesn't work.

if($model->type = 'image')
{
    echo $form->field($model, 'file')->fileInput();
}
else
{
   echo $form->field($model, 'value')->textInput();
}

Do you have to count the active element and record it?

[Jolied]

You need to put js on your processor. <select> and, depending on the type chosen, show/seal or hide the necessary fields.

If you only have two fields, then you can arrange to switch types with help. input:radio:

$this->registerJs(<<<JS
$('#type_switcher input:radio').on('click', function() {
    $('#type_switcher').find('input:not(:radio)').each(function(){
        this.disabled = true;
    });
    $(this).closest('.form-group').find('input:not(:radio)').each(function(){
        this.disabled = false;
    });
});
JS
);

Let's get out of shape fields.

<div id="type_switcher" class="form-group" style="margin-left: 0; margin-right: 0;">
<?= $form->field($model, 'file')
    ->fileInput([
        'class' => 'form-control',
        'disabled' => $model->type != $model::TYPE_FILE
    ])
    ->label(
        Html::activeRadio($model, 'type', [
            'value' => $model::TYPE_FILE,
            'label' => $model->getAttributeLabel('file'),
            'id' => Html::getInputId($model, 'type') . '_' . $model::TYPE_FILE,
        ])
    ) ?>
<?= $form->field($model, 'value')

->textInput([

'maxlength' => true,

'disabled' => $model->type != $model::TYPE_VALUE

])

->label(

Html::activeRadio($model, 'type', [

'value' => $model::TYPE_VALUE,

'label' => $model->getAttributeLabel('value'),

'id' => Html::getInputId($model, 'type') . '_' . $model::TYPE_VALUE,

'uncheck' => null, // !!!

])

) ?>

</div>