This example is the same as example 2, except for the navigation controls that have been activated. The navigation controls are described below. <br/><br/>
This example shows a user-defined hierarchical layout. If the user defines levels for nodes but does not do so for all nodes, an alert will show up and hierarchical layout will be disabled. Either all or none can be defined.
If the smooth curves appear to be inverted, the direction of the edge is not in the same direction as the network.
Every dataset is different. Nodes can have different sizes based on content, interconnectivity can be high or low etc. Because of this, network has a special option
that the user can use to explore which settings may be good for him or her. This is ment to be used during the development phase when you are implementing vis.js. Once you have found
settings you are happy with, you can supply them to network using the documented physics options.