in_form.php

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<?php
function in_form()
{
    // Step 0: Declare dependencies
    global $DIC;
    $ui = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();
    $request = $DIC->http()->request();

    // Step 1: Define the input field.
    // See the implementation of a UploadHandler in Services/UI/classes/class.ilUIDemoFileUploadHandlerGUI.php
    $file = $ui->input()->field()->file(new ilUIDemoFileUploadHandlerGUI(), "File Upload", "You can drop your files here");

    // Step 2: Define the form and attach the field.
    $form = $ui->input()->container()->form()->standard('#', ['file' => $file]);

    // Step 3: Define some data processing.
    $result = '';
    if ($request->getMethod() == "POST") {
        $form = $form->withRequest($request);
        $result = $form->getData();
    }

    // Step 4: Render the form/result.
    return
        "<pre>" . print_r($result, true) . "</pre><br/>" .
        $renderer->render($form);
}