Cannot get Dagre to run

[Eason]

I followed instruction on wiki ( https://github.com/cpettitt/dagre/wiki#an-example-layout)

and I get this error once when I run it: 

 Cannot set property 'width' of undefined (http://localhost:8080/dagre/dagre.js:475)

I tried to debug and I found inputGraph.graph() inside function updateInputGraph is undefined

in line 475: 

inputGraph.graph().width = layoutGraph.graph().width;

This is strange that I followed the tutorial and cannot get it run.

Can someone help me?

[Chris Pettitt]

The example in the wiki has been updated - thanks for pointing out the problem. Immediately after creating the graph, set the graph label to an empty object:

// Set an object for the graph label
g.setGraph({});

- Chris

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[Eason]

Thanks for the quick reply and quick update, it works!

And your reply solved my another question so that now I know g.setGraph({} is the place to set layout configuration.

It would be good to indicate this out in your great wiki too.

And I still have one question left, 

is there a formal way to get all nodes data out of graph instead of graph._nodes ?

Thanks

[Chris Pettitt]

If you want to get the data out as JSON, you can use dagre.graphlib.json.write:

console.log(JSON.stringify(dagre.graphlib.json.write(g), null, 2))

{

  "options": {

    "directed": true,

    "multigraph": false,

    "compound": false

  },

  "nodes": [

    {

      "v": "1",

      "value": {

        "foo": "bar"

      }

    },

    {

      "v": "2",

      "value": {

        "foo": "baz"

      }

    }

  ],

  "edges": []

}

The JSON format can also be read back in.

If you just want to iterate over the nodes and get their values:

g.nodes().forEach(function(v) { console.log(v, g.node(v)); })

1 { foo: 'bar' }

2 { foo: 'baz' }

[Eason]

2014-10-09 10:57 GMT+08:00 Chris Pettitt <ch...@samsarin.com>:

dagre.graphlib.json.write(g)

Awesome, json is exactly what I want. 

Thank you very much for such a great lib!