D3 Examples - Scatterplot of iris data with tooltip

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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;
}
​
.dot {
  stroke: #000;
}
​
.tooltip{
        position: absolute;
        width: 200px;
        height: 28px;
        pointer-events: none;
    }
​
</style>
<body>
<script src="https://d3js.org/d3.v3.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.scale.linear()
    .range([0, width]);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var color = d3.scale.category10();
​
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");
​
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 tooltip = d3.select("body").append("div")
                    .attr("class", "tooltip")
                    .style("opacity", 0);
​
​
d3.csv("iris.csv", function(error, data) {
  if (error) throw error;
​
  data.forEach(function(d) {
    d.SepalLength = +d.SepalLength;
    d.SepalWidth = +d.SepalWidth;
  });
​
​
  x.domain(d3.extent(data, function(d) { return d.SepalWidth; })).nice();
  y.domain(d3.extent(data, function(d) { return d.SepalLength; })).nice();
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Sepal Width (cm)");
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Sepal Length (cm)")
​
  svg.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", 3.5)
      .attr("cx", function(d) { return x(d.SepalWidth); })
      .attr("cy", function(d) { return y(d.SepalLength); })
      .style("fill", function(d) { return color(d.Species); })
      .on("mouseover", function(d){
             tooltip.transition()
                .duration(200)
                .style("opacity", .9);
             tooltip.html("Species:" + d.Species + "<br/> SepalLength:" + d.SepalLength + "<br/> SepalWidth:" + d.SepalWidth)
                .style("left", (d3.event.pageX + 5) + "px")
                .style("top", (d3.event.pageY - 28) + "px");
                })
​
                .on("mouseout", function(d){
                    tooltip.transition()
                        .duration(500)
                        .style("opacity",0);
                });
​
  var legend = svg.selectAll(".legend")
      .data(color.domain())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
​
  legend.append("rect")
      .attr("x", width - 18)
      .attr("width", 18)
      .attr("height", 18)
      .style("fill", color);
​
  legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".35em")
      .style("text-anchor", "end")
      .text(function(d) { return d; });
​
});
​
</script>
    