Feature request preview_image in Backend Preview

[ses2013]

Hi there, thx for the extender. Is there a way to show the preview_image in the Backend Preview ? I can't resolve the Relations to it properly. Thanks for any hint. Stefan

[Teisi]

How did you change the preview in the backend (hook or mod. or ...)? From your own custom content element or from an existing one, for example textmedia?

[ses2013]

Hi, it is actually a hook of the textmedia in the bootstrap_package. Its tricky because of the relation of a relation, right?

[ses2013]

And rendert in Fluid …

[Teisi]

did you do this like: https://blog.teamgeist-medien.de/2016/04/backendvorschau-fuer-eigene-inhaltselemente-mit-flexform.html

then i will check this...

[ses2013]

Yes kind of …

[Teisi]

in the linked method (hook) you can add something like:

$fluidTmpl->assign('row', $row);

$fileRepository = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Resource\FileRepository::class);
$assets = $fileRepository->findByRelation('tt_content', 'assets', $row['uid']);
foreach ($assets as $key => $value) {
        $assets['prevImage'] = $fileRepository->findByRelation('sys_file_reference', 'preview_image', $value->getUid());
}
DebuggerUtility::var_dump($assets);

Did this work for you?

[ses2013]

OK suuper: I get the path to the file now. How would I make a Thumbnail out of it either in den Hook or in Fluid ? Thx this should be the last step …

[Teisi]

i would make this in fluid <f:image or <f:media ...

[ses2013]

Not perfect but works. As there can be only 1 preview_image.

Thanks for your help.

[Teisi]

you can have more than one preview image if you like - you have to overwrite the TCA definition (Configuration/TCA/Overrides/.... in your own extension / theme. And you should still adapt / optimize the above-mentioned code. For example with an "IF" if ever a preview picture exists - and the preview picture also assign to the correct "main" picture/video.