Ссылки «Следующая и предыдущая новость»

<div id="next">
				
      <a href="[+next+]">next</a>
							
</div>

<?php
$ID = $modx->documentIdentifier;
$parentId = array_pop($modx->getParentIds($modx->documentIdentifier,1));

$children = $modx->getActiveChildren($parentId,'menuindex','ASC');

$i=0;
$key = false;
while(!$key && $i<count($children)){
  $key = array_search($ID,$children[$i]);
  $i++;
}

if(!empty($key) && count($children)>1){
$placeholders = array(
'prev'=>($i-2>=0?'<a class="a-i" href="'.$modx->makeUrl($children[$i-2]['id']).'">prev</a>':''),
'next'=>($i<count($children)?'<a class="a-i" href="'.$modx->makeUrl($children[$i]['id']).'">next</a>':'')
);
$output = $modx->parseChunk('prevnext',$placeholders,'[+', '+]');

}
return $output;
?>

<?php
$id = isset($id) ? $id : '';
$it = $modx->documentIdentifier;
$news = $modx->getActiveChildren($id,'menuindex','asc','id,pagetitle');
foreach($news as $key=>$val){
 if($val['id']==$it){
  $prev['id'] = $news[$key-1]['id'];
  $prev['pagetitle'] = $news[$key-1]['pagetitle'];
  $next['id'] = $news[$key+1]['id'];
  $next['pagetitle'] = $news[$key+1]['pagetitle'];
  break;
 }
}
if($prev['id']){
echo'
<div id="prev">
     <a href="[~'.$prev['id'].'~]">← Сюда</a>
</div>';
}
if($next['id']){
echo'
<div id="next">
     <a href="[~'.$next['id'].'~]">Туда →</a>
</div>';
}