How to assign placeholder to captcha's input field ?

So the Captcha image and the input feild are generated like in templates:




<?= $form->field($model, 'verifyCode')->widget(Captcha::className(), [

    'template' => 

        '<div class="row">

            <div class="col-lg-4">{image}</div>

            <div class="col-lg-6">{input}</div>

         </div>'

    ]) 

?>



but I would also like to have placeholder inside input field like "Enter verification code", is this possible ?

http://www.yiiframework.com/doc-2.0/yii-captcha-captcha.html#$options-detail




<?= $form->field($model, 'verifyCode')->widget(Captcha::className(), [

    'template' => 

        '<div class="row">

            <div class="col-lg-4">{image}</div>

            <div class="col-lg-6">{input}</div>

         </div>',

    'options' => ['placeholder' => 'Enter verification code'],

    ]) 

?>



[EDIT]

You may need to set the ‘class’ option explicityly.




    'options' => [

        'placeholder' => 'Enter verification code',

        'class' => 'form-control',

    ],



Thanks.