show_modal_on_button_click.php

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<?php
function show_modal_on_button_click()
{
    global $DIC;
    $factory = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();
    $ctrl = $DIC->ctrl();
    $message = 'Are you sure you want to delete the following items?';
    $ctrl->setParameterByClass('ilsystemstyledocumentationgui', 'modal_nr', 1);
    $form_action = $ctrl->getFormActionByClass('ilsystemstyledocumentationgui');
    $icon = $factory->image()->standard('./templates/default/images/icon_crs.svg', '');
    $modal = $factory->modal()->interruptive('My Title', $message, $form_action)
        ->withAffectedItems(array(
            $factory->modal()->interruptiveItem(10, 'Course 1', $icon, 'Some description text'),
            $factory->modal()->interruptiveItem(20, 'Course 2', $icon, 'Another description text'),
            $factory->modal()->interruptiveItem(30, 'Course 3', $icon, 'Last but not least, a description'),
        ));
    $button = $factory->button()->standard('Show Modal', '')
        ->withOnClick($modal->getShowSignal());

    $out = [$button, $modal];

    // Display POST data of affected items in a panel
    if (isset($_POST['interruptive_items']) && $_GET['modal_nr'] === '1') {
        $panel = $factory->panel()->standard(
            'Affected Items',
            $factory->legacy(print_r($_POST['interruptive_items'], true))
        );
        $out[] = $panel;
    }

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