D3 Examples - d3 scaleBandExample

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<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>    
    var width = 960;
    var height = 500;
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
        var data = [10, 20, 30, 40, 50]
    var yScale = d3.scaleLinear()
        .domain([0, 50])
        .rangeRound([
        10, 
        500
        ])
​
    var xScale = d3.scaleBand()
    .domain(d3.range(data.length))
    .rangeRound([0, 300])
    .paddingInner(0.05);
    
    svg.selectAll('rect')
        .data(data)
        .enter()
        .append('rect')
        .attr('x', (d, i) => xScale(i))
        .attr('y', (d, i) => height - yScale(d))
        .attr('width', xScale.bandwidth())
        .attr('height', (d, i) => yScale(d))
    
    
    function update() {
      data = []
      for(var i = 0;i < 5; i++) 
        data[i] = Math.round(Math.random() * 50);
      console.log(data)
            svg.selectAll('rect')
       .data(data)
        .transition()
       .attr('y', d => height - yScale(d))
       .attr('height', d => yScale(d))
      
    }
//     setInterval(() => update(), 200)
    
  </script>
</body>
​
    