userpicker.php

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<?php
if (empty($vars['name'])) {
    $vars['name'] = 'members';
}
$name = $vars['name'];
$name = htmlspecialchars($name, ENT_QUOTES, 'UTF-8');

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

$handler = elgg_extract('handler', $vars, 'livesearch');
$handler = htmlspecialchars($handler, ENT_QUOTES, 'UTF-8');

$limit = (int)elgg_extract('limit', $vars, 0);

?>
<div class="elgg-user-picker" data-limit="<?php echo $limit ?>" data-name="<?php echo $name ?>" data-handler="<?php echo $handler ?>">
    <input type="text" class="elgg-input-user-picker" size="30"/>
    <input type="checkbox" name="match_on" value="true" />
    <?php echo elgg_view('input/hidden', array('name' => $vars['name'])); ?>
    <label><?php echo elgg_echo('userpicker:only_friends'); ?></label>
    <ul class="elgg-user-picker-list">
        <?php
        foreach ($guids as $guid) {
            $entity = get_entity($guid);
            if ($entity) {
                echo elgg_view('input/userpicker/item', array(
                    'entity' => $entity,
                    'input_name' => $vars['name'],
                ));
            }
        }
        ?>
    </ul>
</div>
<script>
require(['elgg/UserPicker'], function (UserPicker) {
    UserPicker.setup('.elgg-user-picker[data-name="<?php echo $name ?>"]');
});
</script>