To create category attribute thumbnail image, following code snippet can be used to serve the purpose.
You need to create a controller file as following:
<?php
namespace Magemeta\Categorylist\Controller\Adminhtml\Category\Thumbnailimage;
use Magento\Framework\Controller\ResultFactory;
/**
* Class Upload
*/
class Upload extends \Magento\Backend\App\Action
{
protected $baseTmpPath;
/**
* Image uploader
*
* @var \Magento\Catalog\Model\ImageUploader
*/
protected $imageUploader;
/**
* Upload constructor.
*
* @param \Magento\Backend\App\Action\Context $context
* @param \Magento\Catalog\Model\ImageUploader $imageUploader
*/
public function __construct(
\Magento\Backend\App\Action\Context $context,
\Magento\Catalog\Model\ImageUploader $imageUploader
) {
$this->imageUploader = $imageUploader;
parent::__construct($context);
}
public function execute() {
try {
$result = $this->imageUploader->saveFileToTmpDir('thumbnail');
$result['cookie'] = [
'name' => $this->_getSession()->getName(),
'value' => $this->_getSession()->getSessionId(),
'lifetime' => $this->_getSession()->getCookieLifetime(),
'path' => $this->_getSession()->getCookiePath(),
'domain' => $this->_getSession()->getCookieDomain(),
];
} catch (\Exception $e) {
$result = ['error' => $e->getMessage(), 'errorcode' => $e->getCode()];
}
return $this->resultFactory->create(ResultFactory::TYPE_JSON)->setData($result);
}
}
You need to add this in the di.xml of your module:
<type name="Magemeta\Categorylist\Controller\Adminhtml\Category\Thumbnailimage\Upload">
<arguments>
<argument name="imageUploader" xsi:type="object">Magento\Catalog\CategoryImageUpload</argument>
</arguments>
</type>
This is needed because the dependency of your controller called imageUploader is an instance of \Magento\Catalog\Model\ImageUploader. This is just a general class for upload that does not have the base path and base tmp path set. So it does not know where to upload the files.
But in the etc/di.xml file of the catalog module you have this virtual type defined:
<virtualType name="Magento\Catalog\CategoryImageUpload" type="Magento\Catalog\Model\ImageUploader">
<arguments>
<argument name="baseTmpPath" xsi:type="string">catalog/tmp/category</argument>
<argument name="basePath" xsi:type="string">catalog/category</argument>
<argument name="allowedExtensions" xsi:type="array">
<item name="jpg" xsi:type="string">jpg</item>
<item name="jpeg" xsi:type="string">jpeg</item>
<item name="gif" xsi:type="string">gif</item>
<item name="png" xsi:type="string">png</item>
</argument>
</arguments>
</virtualType>