FRONTEND_MVC/widgets/CropperjsWidget.php

<?php
namespace app\widgets;

use yii\base\Widget;
use yii\helpers\Html;

class CropperjsWidget extends Widget
{
    public $image;
    public $file;
    public $post;
	public $aspectRatio;

    public function init()
    {
        parent::init();
        if ($this->image === null) {
            $this->image = 'image';
        }
        if ($this->file === null) {
            $this->file = 'photo';
        }
        if ($this->post === null) {
            $this->post = 'cropper';
        }
        if ($this->aspectRatio === null) {
            $this->aspectRatio = '16/9';
        }
    }

    public function run()
    {
        return $this->render('cropperjswidget/modal');;
    }
}