d3.json

forked from jtr13's block: d3.csv

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v5.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    const w = 525;
    const h = 400;
    const svg = d3.select("body").append("svg").attr("width", w).attr("height", h);
    
    const xScale = d3.scaleLinear().domain([0,1]).range([0,w-60]);
    const yScale = d3.scaleLinear().domain([0,1]).range([h,0]);
    
    const colors = d3.scaleOrdinal(d3.schemeTableau10);
    
    d3.json("https://data.ct.gov/resource/y6p2-px98.json?category=Fruit").then(function (data) {
    console.log(data);
    xScale.domain([d3.min(data.map(d => d.location_1.coordinates[0])),
                   d3.max(data.map(d => d.location_1.coordinates[0]))]);
    yScale.domain([d3.min(data.map(d => d.location_1.coordinates[1])),
                   d3.max(data.map(d => d.location_1.coordinates[1]))]);
      
    svg.selectAll("circle")
      .data(data)
      .enter()
      .append("circle")
      .attr("cx", d => xScale(d.location_1.coordinates[0]))
      .attr("cy", d => yScale(d.location_1.coordinates[1]))
      .attr("r", "3")
      .attr("fill", d => colors(d.item))
      .on("mouseover", function(d) { // IDVW2, p. 270
        var xPos = +d3.select(this).attr("cx");
        var yPos = +d3.select(this).attr("cy");
        d3.select(this).style("cursor", "pointer");
        svg.append("text")
          .attr("id", "tooltip")
          .attr("x", function() {
            if(xPos < w/2) {
              return xPos + 10
            } else {
              return xPos - 10
            }
            })
          .attr("y", yPos)
          .attr("font-size", "11px")
          .attr("text-anchor", function() {
            if(xPos < w/2) {
              return "start"
            } else {
              return "end"
            }
            })
          .attr("alignment-baseline", "middle")
          .text(d.item); // not a function (already in one)
      })
      .on("mouseout", function() {
        d3.select("#tooltip").remove();
      });
    });

</script>
</body>

https://d3js.org/d3.v5.min.js