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If I need to insert image inside admin form inside function _prepareForm I simply call this:

$this->getViewFileUrl("Company_Module::images/icon.png")

But this doesn't work if I call it within custom field renderer

<?php
namespace Company\Module\Block\Adminhtml\Renderer;
class Customtype extends \Magento\Framework\Data\Form\Element\AbstractElement{
  var_dump($this->getViewFileUrl("Company_Module::images/icon.png")); //returns null
}

What would be a proper way to get image url in this case?

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up vote 0 down vote

You need to inject this class into your constructor: \Magento\Framework\View\Asset\Repository Assigning the instance to $this->_assetRepo

Then you can make the getViewFileUrl method:

    public function getViewFileUrl($fileId, array $params = [])
    {
        try {
            return $this->_assetRepo->getUrlWithParams($fileId, $params);
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            return false;
        }
    }
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