[gsoc22] MeshGraphViewer integration feedback

[mwarning]

Hi,

just a unrefined collection of issue I run into when using netjsongraph.js for MeshGraphViewer.
Current code: https://github.com/mwarning/MeshGraphViewer/tree/netjson

• how to disable/hide the "NetJSONGraph" title that is printed on top?
• allow new NetJSONGraph(netjson_options); without passing a path to a json file. For the Meshviewer, the data is available in a variable, it does not come as a file.
• allow a uni colored background for the map. This is a good idea for when no Internet is available or for making screenshots without a mpa background
• Lot's of errors like Node 172.16.146.1 position is undefined! while that is expected. Not all nodes have location information. Can we remove it from the code or make it a warning and then be able to disable it?
• Can't change el again! netjsongraph.min.js, no idea why this is comming
• LinkStyle in https://github.com/openwisp/netjsongraph.js/blob/gsoc22/examples/netjsongraph-elementsLegend.html#L107 gives me hard to locate problems when the json is modified with a missing or unknown link type. => let's a default

[mwarning]

@totallynotvaishnav @nemesisdesign fyi, I need a place to unload my questions and problems as I use the code :-)

[mwarning]

All items listed so far have been resolved!

To get on par of with the features with the current MeshGraphViewer based on the old code base, these two features would be needed/hooked into netjsonmap.js:

• select&highlight nodes [gsoc22] example with node/link highlighting #163
• show clients: [gsoc22] display number of clients #153

What would be needed here is an example that shows how to solves this with hooks/callbacks. I do not think this is a feature that should be part of netjsongraph.js itself.