README.md

## README.md

      
        

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              README.md
            
          
        
      
    
  
    Letter Frequency Bar Chart example rendered with React. This is my first pass at D3 + React. The svg, scales, and axes are defined in componentDidMount. The data is loaded there as well. 
The chart is drawn in render.

  

  

## index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<style>
  .bar {
    fill: steelblue;
  }

  .bar:hover {
    fill: brown;
  }

  .axis text {
    font: 10px sans-serif;
  }

  .axis path,
  .axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
  }

  .x.axis path {
    display: none;
  }
</style>
<script src="https://fb.me/react-0.14.0.js"></script>
<script src="https://fb.me/react-dom-0.14.0.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser.min.js"></script>
<script src="http://d3js.org/d3.v3.js"></script>
</head>
<body>
<div id="graph_container"></div>
<script type="text/babel">

var LetterFrequencyChart = React.createClass({
    getInitialState: function() {
      return {
        data: [],
        svg: "",
        scales: {},
        axes: {},
        display: { width: 960, height: 500, margin: {top: 20, right: 30, bottom: 30, left: 40 }}
      };
    },

    componentDidMount: function() {
      var state = this.state,
          margin = state.display.margin,
          width = state.display.width - margin.left - margin.right,
          height = state.display.height - margin.top - margin.bottom;

      var xScale = d3.scale.ordinal()
        .rangeRoundBands([0, width], .1);

      var yScale = d3.scale.linear()
        .range([height, 0]);

      var xAxis = d3.svg.axis()
        .scale(xScale)
        .orient("bottom");

      var yAxis = d3.svg.axis()
        .scale(yScale)
        .orient("left")
        .ticks(10, "%");

      var that = this;
      d3.tsv("/d/ffb26726c512f3a35643/data.tsv", function(error, data) {
        data = data.map(function(d) { return { letter: d.letter, value: +d.frequency }; });
        xScale.domain(data.map(function(d) { return d.letter; }));
        yScale.domain([0, d3.max(data, function(d){ return d.value; })]);

        that.setState({
          data: data,
          svg: d3.select("#graph").append("svg")
                 .attr("height", height + margin.top + margin.bottom)
                 .attr("width", width + margin.left + margin.right)
                 .attr("class", "chart"),
          scales: { xScale: xScale, yScale: yScale },
          axes: { xAxis: xAxis, yAxis: yAxis }
        });
      });
    },

    render: function() {
      var state = this.state,
          data = state.data,
          svg = state.svg || false,
          margin = state.display.margin,
          width = state.display.width - margin.left - margin.right,
          height = state.display.height - margin.top - margin.bottom,
          xScale = state.scales.xScale,
          yScale = state.scales.yScale,
          xAxis = state.axes.xAxis,
          yAxis = state.axes.yAxis;

      if (svg) {
        var chart = svg.append("g")
          .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

        chart.selectAll(".bar")
      		.data(data)
      		.enter()
      		.append("rect")
    		  .attr("class", "bar")
    		  .attr("x", function(d) { return xScale(d.letter); })
     		  .attr("y", function(d) { return yScale(d.value); })
     		  .attr("height", function(d) { return height - yScale(d.value); })
     		  .attr("width", xScale.rangeBand());

        chart.append("g")
        	.attr("class", "x axis")
        	.attr("transform", "translate(0," + height + ")")
        	.call(xAxis);

        chart.append("g")
        	.attr("class", "y axis")
        	.call(yAxis)
        	.append("text")
        	.attr("transform", "rotate(-90)")
        	.attr("y", 6)
        	.attr("dy", ".71em")
        	.style("text-anchor", "end")
        	.text("Frequency");
      }

      return (
        <div id="graph"></div>
      );
    }
  });

  ReactDOM.render(
    <LetterFrequencyChart />,
    document.getElementById("graph_container")
  );
</script>

## thumbnail.png

      
        

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              thumbnail.png