ScatterPlotTrivariate_D3

<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
</style>
<body>

<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

// set the dimensions and margins of the graph
var margin = {top: 50, right: 250, bottom: 100, left: 100},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// set X and Y axis
var x = d3.scaleLinear()
          .range([0, width]);
var y = d3.scaleLinear()
          .range([height, 0]);

// set color func
var color = d3.scaleOrdinal(d3.schemeCategory20);
     
var valueline = d3.line()
  .x(function(d) {return x(d.Robbery);})
  .y(function(d) {return y(d.Assault);});

// create svg
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 + ")");

// get data
d3.csv("crime3.csv", function(error, data) {
  if (error) throw error;

// format data
  data.forEach(function(d) {
    d.Robbery = +d.Robbery;
    d.Assault = +d.Assault;
  });
  console.log(data);
  
  // Scale the range of the data for X and Y axis
  x.domain(d3.extent(data, function(d) { return d.Robbery; }));
  y.domain(d3.extent(data, function(d) { return d.Assault; }));

// Add the scatterplot
  svg.selectAll("dot")
      .data(data)
    .enter().append("circle")
      .attr("r", 5)
      .attr("cx", function(d) { return x(d.Robbery); })
      .attr("cy", function(d) { return y(d.Assault); })
      .style("fill", function(d){ return color(d.Department); });

// add the x-axis
  svg.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

// add x-axis label
  svg.append("text")
      .attr("text-anchor", "end")
      .attr("x", width/2)
      .attr("y", height + 50)
      .text("# Robbery");
     
  // add y-axis
  svg.append("g")
      .call(d3.axisLeft(y));

//add y-axis label
    svg.append("text")
      .attr("transform", "rotate(-90)")
      .attr("x",0 - (height / 2))
      .attr("y", 0 - margin.left + 20)
      .attr("dy", "1em")
      .style("text-anchor", "middle")
      .text("# Assault");

//adding title
    svg.append("text")
      .attr("text-anchor", "end")
      .attr("x", width/2 + 50)
      .attr("y", -15)
      .text("Alabaster Assault v Robbery");

var legend = svg.selectAll('legend')
      .data(color.domain())
      .enter()
      .append('g')
      .attr('class', 'legend')
      .attr('transform', function(d,i){ return 'translate(0,' + i * 20 + ')'; });

//cretaing legend
    legend.append('rect')
      .attr('x', width + 20)
      .attr('width', 18)
      .attr('height', 18)
      .style('fill', color);

legend.append('text')
      .attr('x', width + 40)
      .attr('y', 9)
      .attr('dy', '.35em')
      .style('text-anchor', 'start')
      .text(function(d){ return d; });

});

</script>
</body>

https://d3js.org/d3.v4.min.js