autocomplete.php

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<?php
$vars['class'] = elgg_extract_class($vars, 'elgg-input-autocomplete');

$defaults = [
    'value' => '',
    'disabled' => false,
];

$vars = array_merge($defaults, $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();
}

$match_on = elgg_extract('match_on', $vars);
if (empty($match_on) || is_array($match_on)) {
    elgg_log('"input/autocomplete" must specify a single "match_on" parameter');
    return;
}

if ($match_on == 'all') {
    elgg_log('"input/autocomplete" no longer supports matching on "all" entities');
    return;
}

if ($match_on == 'friends') {
    $match_on = 'users';
    $params['friends_only'] = true;
}

$params['match_on'] = $match_on;
unset($vars['match_on']);

if (isset($vars['match_owner'])) {
    $params['match_owner'] = elgg_extract('match_owner', $vars);
    unset($vars['match_owner']);
}

if (isset($vars['match_membership'])) {
    $params['match_membership'] = elgg_extract('match_membership', $vars);
    unset($vars['match_membership']);
}

if (isset($vars['match_target'])) {
    $target = elgg_extract('match_target', $vars);
    if ($target instanceof ElggEntity) {
        $target_guid = $target->guid;
    } else {
        $target_guid = (int) $target;
    }
    $params['match_membership'] = $target;
    unset($vars['match_membership']);
}

$params['view'] = 'json'; // force json viewtype
$handler = elgg_extract('handler', $vars, "livesearch/$match_on");
$source = elgg_normalize_url(elgg_http_add_url_query_elements($handler, $params));

$vars['type'] = 'text';
$vars['data-source'] = $source;
echo elgg_format_element('input', $vars);

// inline script in case loaded via ajax
?>
<script>
    require(['elgg/autocomplete'], function (autoc) {
        autoc.init();
    });
</script>