neovis.js

neovis.js

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Graph visualizations powered by vis.js with data from Neo4j.

Features

  • Connect to Neo4j instance to get live data
  • User specified labels and property to be displayed
  • User specified Cypher query to populate
  • Specify node property for url of image for node
  • Specify edge property for edge thickness
  • Specify node property for community / clustering
  • Specify node property for node size
  • Configure popover

Install

Neovis.js can be installed via npm:

npm install --save neovis.js

you can also obtain neovis.js via CDN:

CDN

For ease of use Neovis.js can be obtained from Neo4jLabs CDN:

Most recent release


<script src="https://unpkg.com/neovis.js@2.0.2"></script>

Version without neo4j-driver dependency


<script src="https://unpkg.com/neovis.js@2.0.2/dist/neovis-without-dependencies.js"></script>

Quickstart Example

Let's go through the steps to reproduce this visualization:

Prepare Neo4j

Start with a blank Neo4j instance, or spin up a blank Neo4j Sandbox. We'll load the Game of Thrones dataset, run:


LOAD CSV WITH HEADERS FROM 'https://raw.githubusercontent.com/mathbeveridge/asoiaf/master/data/asoiaf-all-edges.csv'
AS row
MERGE (src:Character {name: row.Source})
MERGE (tgt:Character {name: row.Target})
MERGE (src)-[r:INTERACTS]->(tgt)
  ON CREATE SET r.weight = toInteger(row.weight)

We've pre-calculated PageRank and ran a community detection algorithm to assign community ids for each Character. Let's load those next:


LOAD CSV WITH HEADERS FROM 'https://raw.githubusercontent.com/johnymontana/neovis.js/master/examples/data/got-centralities.csv'
AS row
MATCH (c:Character {name: row.name})
SET c.community = toInteger(row.community),
c.pagerank = toFloat(row.pagerank)

Our graph now consists of Character nodes that are connected by an INTERACTS relationships. We can visualize the whole graph in Neo4j Browser by running:


MATCH p = (:Character)-[:INTERACTS]->(:Character)
RETURN p

We can see characters that are connected and with the help of the force directed layout we can begin to see clusters in the graph. However, we want to visualize the centralities (PageRank) and community detection results that we also imported.

Specifically we would like:

  • Node size to be proportional to the Character's pagerank score. This will allow us to quickly identify important nodes in the network.
  • Node color to determined by the community property. This will allow us to visualize clusters.
  • Relationship thickeness should be proportional to the weight property on the INTERACTS relationship.

Neovis.js, by combining the JavaScript driver for Neo4j and the vis.js visualization library will allow us to build this visualization.

index.html

Create a new html file:

<!doctype html>
<html>
<head>
    <title>Neovis.js Simple Example</title>
    <style type="text/css">
        html, body {
            font: 16pt arial;
        }

        #viz {
            width: 900px;
            height: 700px;
            border: 1px solid lightgray;
            font: 22pt arial;
        }
    </style>
</head>
<body onload="draw()">
<div id="viz"></div>
</body>
</html>

We define some basic CSS to specify the boundaries of a div and then create a single div in the body. We also specify onload="draw()" so that the draw() function is called as soon as the body is loaded.

We need to pull in neovis.js:


<script src="https://unpkg.com/neovis.js@2.0.2"></script>

And define our draw() function:


<script type="text/javascript">

    let neoViz;

    function draw() {
        const config = {
            containerId: "viz",
            neo4j: {
                serverUrl: "bolt://localhost:7687",
                serverUser: "neo4j",
                serverPassword: "sorts-swims-burglaries",
            },
            labels: {
                Character: {
                    label: "name",
                    value: "pagerank",
                    group: "community",
                    [NeoVis.NEOVIS_ADVANCED_CONFIG]: {
                        function: {
                            title: (node) => viz.nodeToHtml(node, [
                                "name",
                                "pagerank"
                            ])
                        }
                    }
                }
            },
            relationships: {
                INTERACTS: {
                    value: "weight"
                }
            },
            initialCypher: "MATCH (n)-[r:INTERACTS]->(m) RETURN *"
        };

        neoViz = new NeoVis.default(config);
        neoViz.render();
    }
</script>

This function creates a config object that specifies how to connect to Neo4j, what data to fetch, and how to configure the visualization.

See simple-example.html for the full code.

module usage

you can also use it as module, but it would require you have a way to import css files

import NeoVis from 'neovis.js';

or you can import the version with bundled dependency

import NeoVis from 'neovis.js/dist/neovis.js';

Api Reference

Api Reference

Build

This project uses git submodules to include the dependencies for neo4j-driver and vis.js. This project uses webpack to build a bundle that includes all project dependencies. webpack.config.js contains the configuration for webpack. After cloning the repo:

npm install
npm run build
npm run typedoc

will build dist/neovis.js and dist/neovis-without-dependencies.js

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