base.php

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<?php
function base()
{
    global $DIC;
    $factory = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();

    // Handle a file upload ajax request
    if (isset($_GET['example']) && $_GET['example'] == 1) {
        $upload = $DIC->upload();
        try {
            $upload->process();
            // $upload->moveFilesTo('/myPath/'); // Since we are in an example here, we do not move the files. But this would be the way wou move files using the FileUpload-Service

            // The File-Dropzones will expect a valid json-Status (success true or false).
            echo json_encode([ 'success' => true, 'message' => 'Successfully uploaded file' ]);
        } catch (Exception $e) {
            // See above
            echo json_encode([ 'success' => false, 'message' => $e->getMessage() ]);
        }
        exit();
    }

    $uploadUrl = $_SERVER['REQUEST_URI'] . '&example=1';
    $dropzone = $factory->dropzone()
                        ->file()
                        ->standard($uploadUrl)
                        ->withUploadButton($factory->button()->standard('Upload', ''));

    return $renderer->render($dropzone);
}