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Node Order

Hi! I need to alter order of my nodes in a tree (via Javascript), but only nodes at the same level, so i can move nodes changing order but never parent. How can i do this?
Regards,

You can set "onDrag" event handler. "onDrag" event occurs in case of moving nodes manually (drag-n-drop) or by the script (moveItem method).

If the function returns false, the moving will be denied.

For example:

tree.setDragBehavior(sibling);

tree.attachEvent("onDrag",function(id,targe_id){

    if(tree.getParentId(id)==tree.getParentId(target_id)) return true

    else
        return false
})