How to you find the previous/next sibling of a node?

Question

with eZ Publish, when given an ezContentObjectTreeNode object, how can I find its previous/next sibling? Is there a template operator? If not, is there a php method?

Answer 1

Here is a way, based on the children property of the node.

         {foreach $node.parent.children as $k => $v}
        {if eq($node.node_id, $v.node_id)}
            {if gt($k, 0)}
                {set $prev = $node.parent.children[$k|dec()]}
            {/if}
            {if lt($k, $node.parent.children|count())}
                {set $next = $node.parent.children[$k|inc()]}
            {/if}
        {/if}   
     {/foreach}

You could also use a template fetch function. http://doc.ez.no/eZ-Publish/Technical-manual/3.6/Reference/Modules/content/Fetch-functions/list

I'm not sure if the first method will maintain sorting. However if you use the fetch function properly that certainly will.