pickercallback.php

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<?php
// Load Elgg engine
$site_url = elgg_get_site_url();

// Get callback type (list or picker)
$type = get_input('type', 'picker');

$collection = (int) get_input('collection', 0);
$members = get_members_of_access_collection($collection, true);
if (!$members) {
    $members = array();
}

$friendspicker = (int) get_input('friendspicker', 0);

// Get page owner (bomb out if there isn't one)
$pageowner = elgg_get_page_owner_entity();
if (!$pageowner) {
    forward();
    exit;
}

// Depending on the view type, launch a different view
switch($type) {
    case 'list':
        $js_segment = elgg_view('core/friends/tablelistcountupdate', array(
            'friendspicker' => $friendspicker,
            'count' => sizeof($members),
        ));
        $content = elgg_view('core/friends/tablelist', array(
            'entities' => $members,
            'content' => $js_segment,
        ));
        break;
    default:
        $friends = $pageowner->getFriends(array('limit' => 0));

        $content = elgg_view('input/friendspicker', array(
            'entities' => $friends,
            'value' => $members,
            'callback' => true,
            'friendspicker' => $friendspicker,
            'collection_id' => $collection,
            'formtarget' => $site_url . 'action/friends/collections/edit',
        ));
        break;
}

// Output the content
echo $content;