D3 Examples - The Force with React + D3, Approach #3

The Force with React + D3, Approach #3
React + D3 exploration with the force layout:
React for structure
D3 for data calculation
D3 for rendering
Pro:
The viz scales!
Use all the d3 functions!
Con:
Why you even React, bro?
Use case: React app with a large and frequently updating visualization
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<!DOCTYPE html>
<meta charset="utf-8">
<head>
  <script src="https://fb.me/react-0.14.3.js"></script>
  <script src="https://fb.me/react-dom-0.14.3.js"></script>
  <script src="https://npmcdn.com/babel-core@5.8.34/browser.min.js"></script>
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <script src="https://underscorejs.org/underscore-min.js"></script>
  <script src="generate_data.js"></script>
​
  <link rel="stylesheet" href="example.css" type="text/css" />
</head>
​
<body>
​
<div id="main" />
​
<script type="text/babel">
​
var width = 960;
var height = 500;
var force = d3.layout.force()
  .charge(-300)
  .linkDistance(50)
  .size([width, height]);
​
// *****************************************************
// ** d3 functions to manipulate attributes
// *****************************************************
​
var enterNode = (selection) => {
  selection.classed('node', true);
​
  selection.append('circle')
    .attr("r", (d) => d.size)
    .call(force.drag);
​
  selection.append('text')
    .attr("x", (d) => d.size + 5)
    .attr("dy", ".35em")
    .text((d) => d.key);
};
​
var updateNode = (selection) => {
  selection.attr("transform", (d) => "translate(" + d.x + "," + d.y + ")");
};
​
var enterLink = (selection) => {
  selection.classed('link', true)
    .attr("stroke-width", (d) => d.size);
};
​
var updateLink = (selection) => {
  selection.attr("x1", (d) => d.source.x)
    .attr("y1", (d) => d.source.y)
    .attr("x2", (d) => d.target.x)
    .attr("y2", (d) => d.target.y);
};
​
var updateGraph = (selection) => {
  selection.selectAll('.node')
    .call(updateNode);
  selection.selectAll('.link')
    .call(updateLink);
};
​
// *****************************************************
// ** Graph and App components
// *****************************************************
​
var Graph = React.createClass({
  componentDidMount() {
    this.d3Graph = d3.select(ReactDOM.findDOMNode(this.refs.graph));
    force.on('tick', () => {
      // after force calculation starts, call updateGraph
      // which uses d3 to manipulate the attributes,
      // and React doesn't have to go through lifecycle on each tick
      this.d3Graph.call(updateGraph);
    });
  },
​
  shouldComponentUpdate(nextProps) {
    this.d3Graph = d3.select(ReactDOM.findDOMNode(this.refs.graph));
​
    var d3Nodes = this.d3Graph.selectAll('.node')
      .data(nextProps.nodes, (node) => node.key);
    d3Nodes.enter().append('g').call(enterNode);
    d3Nodes.exit().remove();
    d3Nodes.call(updateNode);
​
    var d3Links = this.d3Graph.selectAll('.link')
      .data(nextProps.links, (link) => link.key);
    d3Links.enter().insert('line', '.node').call(enterLink);
    d3Links.exit().remove();
    d3Links.call(updateLink);
​
    // we should actually clone the nodes and links
    // since we're not supposed to directly mutate
    // props passed in from parent, and d3's force function
    // mutates the nodes and links array directly
    // we're bypassing that here for sake of brevity in example
    force.nodes(nextProps.nodes).links(nextProps.links);
    force.start();
​
    return false;
  },
​
  render() {
    return (
      <svg width={width} height={height}>
        <g ref='graph' />
      </svg>
    );
  }
});
​
var App = React.createClass({
  getInitialState() {
    return {
      nodes: [],
      links: [],
    };
  },
​
  componentDidMount() {
    this.updateData();
  },
​
  updateData() {
    // randomData is loaded in from external file generate_data.js
    // and returns an object with nodes and links
    var newState = randomData(this.state.nodes, width, height);
    this.setState(newState);
  },
​
  render() {
    return (
      <div>
        <div className="update" onClick={this.updateData}>update</div>
        <Graph nodes={this.state.nodes} links={this.state.links} />
      </div>
    );
  },
});
​
ReactDOM.render(
  <App />,
  document.getElementById('main') 
);
​
</script>
​
</body>
    