Magento 2 – Display Image in Module Template phtml File

I assume that you want the quickview.phtml to appear in a lightbox without leaving the current page.

To do this, you will need to change the button action to an ajax call with a custom controller action to return the new dynamic HTML.

There are a number of existing extensions out there, and I highly recommend that you use one of them instead of creating your own solution. To do this right, it could easily take dozens of hours to implement (especially if you have any configurable or bundled products).

Take a look here:

https://www.magentocommerce.com/magento-connect/catalogsearch/result/?q=product+quick+view&pl=0

I have used both the Amasty and Belvg ones in the past for various projects.

This worked for me:

public function getProductImageUrl($product)
{
    return $this->_image->init($product, 'product_base_image')->constrainOnly(FALSE)
                ->keepAspectRatio(TRUE)
                ->keepFrame(FALSE)
                ->getUrl();
}