collection.php

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<?php
$coll = $vars['collection'];

if (is_array($vars['collection']->members)) {
    $count = sizeof($vars['collection']->members);
} else {
    $count = 0;
}

echo "<li><h2>";

//as collections are private, check that the logged in user is the owner
if ($coll->owner_guid == elgg_get_logged_in_user_guid()) {
    echo "<div class=\"friends_collections_controls\">";
    echo elgg_view('output/url', array(
            'href' => 'action/friends/collections/delete?collection=' . $coll->id,
            'class' => 'delete_collection',
            'text' => elgg_view_icon('delete'),
            'encode_text' => false,
            'confirm' => true,
        ));
    echo "</div>";
}
echo $coll->name;
echo " (<span id=\"friends_membership_count{$vars['friendspicker']}\">{$count}</span>) </h2>";

// individual collection panels
$friends = $vars['collection']->entities;
if ($friends) {
    $content = elgg_view('core/friends/collectiontabs', array(
        'owner' => elgg_get_logged_in_user_entity(),
        'collection' => $vars['collection'],
        'friendspicker' => $vars['friendspicker'],
    ));

    echo elgg_view('input/friendspicker', array(
        'entities' => $friends,
        'value' => $vars['collection']->members,
        'content' => $content,
        'replacement' => '',
        'friendspicker' => $vars['friendspicker'],
    ));
?>
    <script>
    require(['elgg', 'jquery'], function(elgg, $) {
        $(function () {
            var url = elgg.config.wwwroot + 'collections/pickercallback' +
                '?username=<?php echo elgg_get_logged_in_user_entity()->username; ?>' +
                '&type=list&collection=<?php echo $vars['collection']->id; ?>';
            $('#friends-picker_placeholder<?php echo $vars['friendspicker']; ?>').load(url);
        });
    });
    </script>
    <?php
}

// close friends-picker div and the accordian list item
echo "</li>";