Dropzone only builds thumbnail for last file - php

Question

i need to preload existing files into an instance of a Dropzone-Div. I looked up some similar issues on the net, but couldn't find something. I want to create Thumbnails on the go and it works great as Long as there is only one file. If there is more then 1 file it only generates the thumbnail for the last one.
This is the init-function from my .dropzone:
init: function() {
// Create the mock files:
var dropZoneInstance = this;
// Load Files
$.ajax({
url: 'ajaxcall.php',
data: {id: profil,zuordnung: zuordnung, ajaxcall: 'readAnhänge'},
success: function (response) {
var files = JSON.parse(response);
for (i = 0; i < files.length; i++)
{
var obj = files[i];
console.log(obj);
dropZoneInstance.files.push(obj);
dropZoneInstance.emit("addedfile", obj);
dropZoneInstance.createThumbnailFromUrl(obj,
dropZoneInstance.options.thumbnailWidth,
dropZoneInstance.options.thumbnailHeight,
dropZoneInstance.options.thumbnailMethod, true, function (thumbnail)
{
dropZoneInstance.emit('thumbnail', obj, thumbnail);
}
);
dropZoneInstance.emit("complete", obj);
}
}
});
}
This is the PHP-Code for the JSON:
function ReadFromZuordnung($zuordnung = 0)
{
$var = Array();
global $dbh;
global $user;
$query = $dbh->prepare("
SELECT
anhang_id AS id
FROM
tbl_anhang
WHERE
anhang_profil = :profil
AND
anhang_zuordnung = :zuordnung
");
$query->bindValue(':profil', $this->getId(), PDO::PARAM_INT);
$query->bindValue(':zuordnung', $zuordnung, PDO::PARAM_INT);
$query->setFetchMode(PDO::FETCH_CLASS, 'Test');
$query->execute();
while($row = $query->fetch())
{
$var[] = Array("id"=>$row->getId(),"name"=>$row->getName(),"size"=>0,"dataURL"=>$this->getUploadPfad().$row->getName());
}
echo json_encode($var);
}
And thats my test.php:
<div id="dropzone" class="dropzone" profil="1">
<div class="dz-default dz-message"></div>
</div>
That's the result: https://imgur.com/9ezsnrk
I want to have thumbnails for every file, not just the last one.
Any Suggestions?

Answer 1

Ok, i got it myself after two more days of searching for answerts:
Just changing
var obj = files[i];
to
let obj = files[i];
solved the Problem.
Maybe someone else will save some time when he is having the same Problem.