Embedding D3 interactive charts part 2

Embedding D3 interactive charts Part 2 - Testing reading in of file from directory

Just having fun - testing to see if I could embed D3 charts in my blog.

Seems like it works too! But I would have to upload the csv under public folder first.

<meta charset="utf-8">

<!-- Load d3.js -->
<script src="https://d3js.org/d3.v4.js"></script>

<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>

<script>

// set the dimensions and margins of the graph
var margin = {top: 10, right: 30, bottom: 30, left: 60},
    width = 460 - margin.left - margin.right,
    height = 450 - margin.top - margin.bottom;

// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
  .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 + ")");

//Read the data
d3.csv("/post/data/2_TwoNum.csv", function(data) {

  // Add X axis
  var x = d3.scaleLinear()
    .domain([0, 3000])
    .range([ 0, width ]);
  svg.append("g")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x));

  // Add Y axis
  var y = d3.scaleLinear()
    .domain([0, 400000])
    .range([ height, 0]);
  svg.append("g")
    .call(d3.axisLeft(y));

  // Add a tooltip div. Here I define the general feature of the tooltip: stuff that do not depend on the data point.
  // Its opacity is set to 0: we don't see it by default.
  var tooltip = d3.select("#my_dataviz")
    .append("div")
    .style("opacity", 0)
    .attr("class", "tooltip")
    .style("background-color", "white")
    .style("border", "solid")
    .style("border-width", "1px")
    .style("border-radius", "5px")
    .style("padding", "10px")



  // A function that change this tooltip when the user hover a point.
  // Its opacity is set to 1: we can now see it. Plus it set the text and position of tooltip depending on the datapoint (d)
  var mouseover = function(d) {
    tooltip
      .style("opacity", 1)
  }

  var mousemove = function(d) {
    tooltip
      .html("The exact value of<br>the Ground Living area is: " + d.GrLivArea)
      .style("left", (d3.mouse(this)[0]+90) + "px") // It is important to put the +90: other wise the tooltip is exactly where the point is an it creates a weird effect
      .style("top", (d3.mouse(this)[1]) + "px")
  }

  // A function that change this tooltip when the leaves a point: just need to set opacity to 0 again
  var mouseleave = function(d) {
    tooltip
      .transition()
      .duration(200)
      .style("opacity", 0)
  }

  // Add dots
  svg.append('g')
    .selectAll("dot")
    .data(data.filter(function(d,i){return i<50})) // the .filter part is just to keep a few dots on the chart, not all of them
    .enter()
    .append("circle")
      .attr("cx", function (d) { return x(d.GrLivArea); } )
      .attr("cy", function (d) { return y(d.SalePrice); } )
      .attr("r", 7)
      .style("fill", "#69b3a2")
      .style("opacity", 0.3)
      .style("stroke", "white")
    .on("mouseover", mouseover )
    .on("mousemove", mousemove )
    .on("mouseleave", mouseleave )

})

</script>