D3 Examples - barchart

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<!DOCTYPE html>
<style>
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
    
  d3.csv('stocks.csv', function(error, data){
   
    var n = 4, // number of samples
    m = 11; // number of series
​
    data.forEach(function(d) {
      d.price = +d.price
      d.date = d.date.slice(-4)
      ;})
          
    var data_reshaped = d3.nest()
    .key(function(d) {return d.date;})  
    .sortKeys(d3.ascending)
    .key(function(d) {return d.symbol;}) 
    .rollup(function(d) { 
      return {
        avg_stock_value:d3.mean(d,function(g) {
          return +g.price})   
    }})
    .entries(data);
    
    dataFormat = d3.range(m).map(function(index) {
    return d3.range(n).map(function(i) {
      return Math.round(data_reshaped[index].values[i].value.avg_stock_value*10)/10
    }); 
    })
    data_stacked = d3.stack().keys(d3.range(m))(dataFormat)
    
    var max = d3.max(data,function(d,index){ 
    return +d.price})
       
​
    var margin = {top: 10, right: 10, bottom: 10, left: 10},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
    
    var y = d3.scaleLinear()
    .domain([0, max])
    .range([0,height]);
​
​
    var x0 = d3.scaleBand()
    .range([0, width])
    .domain(d3.range(m));
        
    var x1 = d3.scaleBand()
    .domain(d3.range(n))
    .range([0, x0.bandwidth()]);
​
​
    var z = d3.scaleOrdinal()
      .range(["#fe9c23","#d0743c","#a05d56","#6b486b"]);
    
​
    var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
​
    var bar = svg.append("g").selectAll("g")
        .data(dataFormat) 
      .enter().append("g")   
        .attr("transform", function(d, i) { 
        return "translate(" + x0(i) + ",0)"; })
    
    
    var bar_group = bar.selectAll("rect") 
      .data(function(d) { 
      return d; })
      .enter()
    .append("rect")
        .style("fill",function(d,i){
      return z(i)})
      .attr("x", function(d, i) {
                        return x1(i); })
      .attr("height", y)
      .attr("y", function(d) {
                return height - y(d); })
      
      .attr("width", x1.bandwidth()*0.8)
        
    
  });
​
</script>
    