userpicker.php

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<?php
$name = elgg_extract('name', $vars, 'members', false);

$guids = (array) elgg_extract('values', $vars, elgg_extract('value', $vars, []));

$params = elgg_extract('options', $vars, []);

$friends_only = (bool) elgg_extract('only_friends', $vars, false);
$show_friends = (bool) elgg_extract('show_friends', $vars, !$friends_only);
if ($friends_only) {
    $params['friends_only'] = true;
}

$params['include_banned'] = (bool) elgg_extract('include_banned', $vars, false);

if (!empty($params)) {
    ksort($params);

    // We sign custom parameters, so that plugins can validate
    // that the request is unaltered, if needed
    $mac = elgg_build_hmac($params);
    $params['mac'] = $mac->getToken();
}

$handler = elgg_extract('handler', $vars, 'livesearch');
$params['view'] = 'json'; // force json viewtype

$wrapper_options = [
    'class' => elgg_extract_class($vars, ['elgg-user-picker']),
    'data-limit' => (int) elgg_extract('limit', $vars, 0),
    'data-name' => $name,
    'data-handler' => elgg_http_add_url_query_elements($handler, $params),
];

$picker = elgg_format_element('input', [
    'type' => 'text',
    'class' => 'elgg-input-user-picker',
    'size' => 30,
    'id' => elgg_extract('id', $vars),
    'placeholder' => elgg_extract('placeholder', $vars),
]);

$picker .= elgg_view('input/hidden', ['name' => $name]);
    
if ($show_friends) {
    $picker .= elgg_view('input/checkbox', [
        'name' => 'match_on',
        'value' => 'friends',
        'default' => elgg_extract('match_on', $vars, 'users', false),
        'label' => elgg_echo('userpicker:only_friends'),
    ]);
} elseif ($friends_only) {
    $wrapper_options['data-match-on'] = 'friends';
} else {
    $wrapper_options['data-match-on'] = elgg_extract('match_on', $vars, 'users', false);
}

$items = '';
foreach ($guids as $guid) {
    $entity = get_entity((int) $guid);
    if (!$entity instanceof \ElggEntity) {
        continue;
    }
    
    $items .= elgg_view('input/autocomplete/item', [
        'entity' => $entity,
        'input_name' => $name,
    ]);
}

$picker .= elgg_format_element('ul', ['class' => 'elgg-list elgg-user-picker-list'], $items);

echo elgg_format_element('div', $wrapper_options, $picker);

?>
<script>
    require(['elgg/UserPicker'], function (UserPicker) {
        var name = <?= json_encode($name) ?>;
        UserPicker.setup('.elgg-user-picker[data-name="' + name + '"]');
    });
</script>