D3 Examples - [introd3] scatterplot using iris dataset (template)

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.axis path, .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
var x = d3.scaleLinear()
  .range([0, width])
    // domain, range
​
var y = d3.scaleLinear()
    .range([0, height])
​
var r = d3.scaleSqrt()
    .range([10,20])
  
var xAxis = d3.axisBottom()
        .scale(x);
​
var yAxis = d3.axisLeft()
        .scale(y);
​
// var color = 
    
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 + ")");
​
d3.csv('iris.csv', function(error, data){
​
  // preprocessing
  data.forEach(function(d){
    d.sepal_length = +d.sepal_length;
    d.sepal_width = +d.sepal_width;
    d.petal_length = +d.petal_length;
    d.petal_width = +d.petal_width;
    });
​
  // update scales
    x.domain(d3.extent(data, function(d) {
    return d.sepal_length;
  }));
​
    // y.domain(...
    y.domain(d3.extent(data, function(d) {
    return d.sepal_width;
  }));
​
    // r.domain(...
  r.domain(d3.extent(data, function(d) {
    return d.petal_length;
  }))
  
var color = d3.scaleOrdinal(d3.schemeCategory20);
 
  // Add axis names
  // ...
  
    svg.selectAll("circle").data(data).enter()
      .append("circle")
            .attr("class", "dot")
            .attr("r", function(d){ return r(d.petal_length)})
        .style("fill", function(d){return color(d.species)})
            .attr("transform", function(d) {
            return "translate(" + x(d.sepal_length) + "," + y(d.sepal_width) +")"; 
            })
        .on("click", function() {
          d3.selectAll("circle")
            .style("stroke-width", 0)
          d3.select(this)
            .style("stroke-width", 3)
            .style("stroke", "red")
         })
    
        .on("mouseenter", function(d) {
           
            svg
            .append("text")
            .style("font-size", "36px")
            .attr("class", "label")
            .attr("transform", function() {
               return "translate(" + x(d.sepal_length) + "," + y(d.sepal_width) +")";
            })
            .text(function() { 
              return "(" + d.sepal_width + "," + d.sepal_length +")"; 
            })
            
         })
       
 
  svg.append('g')
    .attr('transform', 'translate(0,' + height + ')')
    .attr('class', 'x axis')
    .call(xAxis);
​
  svg.append("text")
    .text("Sepal Length")
    .attr("x", function() {return width - 20 ;})
    .attr("y", function() {return height - 10;})
    .style("text-anchor", "end")
  
  svg.append('g')
    .attr('transform', 'translate(0,0)')
    .attr('class', 'y axis')
    .call(yAxis);
  
    // create legend
  var legend = svg.selectAll(".legend")
  //  .data( ...
​
  // legend.append("rect")
  // ...
  
  // legend.append("text")
    // ...
  
});
  
</script>
    