tags.php

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

$defaults = [
    'value' => '',
    'autocapitalize' => 'off',
    'type' => 'text',
];

if (isset($vars['entity'])) {
    $defaults['value'] = elgg_extract('entity', $vars)->tags;
    unset($vars['entity']);
}

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

// set tagify options
if (!isset($vars['data-tagify-opts']) && isset($vars['tagify_options'])) {
    $vars['data-tagify-opts'] = json_encode($vars['tagify_options']);
}

unset($vars['tagify_options']);

if (is_array($vars['value'])) {
    $tags = [];

    foreach ($vars['value'] as $tag) {
        if (is_string($tag)) {
            $tags[] = $tag;
        } else {
            $tags[] = $tag->value;
        }
    }

    $vars['value'] = implode(', ', $tags);
}

echo elgg_format_element('input', $vars);

if (isset($vars['id'])) {
    $selector = "#{$vars['id']}";
} else {
    $name = elgg_extract('name', $vars);
    $selector = ".elgg-input-tags[name='{$name}']";
}

?>
<script>
    require(['input/tags'], function (tags) {
        tags.init(<?= json_encode($selector) ?>);
    });
</script>