entitypicker.php

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

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

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

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();
}

$params['view'] = 'json'; // force json viewtype

$wrapper_options = [
    'class' => elgg_extract_class($vars, ['elgg-entity-picker']),
    'data-limit' => (int) elgg_extract('limit', $vars, 0),
    'data-name' => $name,
    'data-match-on' => elgg_extract('match_on', $vars, 'entities', false),
    'data-handler' => elgg_http_add_url_query_elements(elgg_extract('handler', $vars, 'livesearch'), $params),
];

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

$picker .= elgg_view('input/hidden', ['name' => $name]);
$picker .= elgg_extract('picker_extras', $vars, '');

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

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

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

?>
<script>
    import('input/entitypicker').then((entitypicker) => {
        entitypicker.default.setup('.elgg-entity-picker[data-name="' + <?= json_encode($name) ?> + '"]');
    });
</script>