Reputation: 115

Show the tooltip value inside the "rect" on mouseover in d3 stacked area chart

<!DOCTYPE html>
<html>

<head>
  <script data-require="[email protected]" data-semver="3.5.3" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script>
  <style>
    body {
      font: 10px sans-serif;
    }
    .axis path,
    .axis line {
      fill: none;
      stroke: #000;
      shape-rendering: crispEdges;
    }
    .x.axis path {
      display: none;
    }
    .line {
      fill: none;
      stroke: steelblue;
      stroke-width: 1.5px;
    }
  </style>
</head>

<body>
  <script>
    var myData = "date	New York	San Francisco	Austin\n\
20111001	63.4	62.7	72.2\n\
20111002	58.0	59.9	67.7\n\
20111003	53.3	59.1	69.4\n\
20111004	55.7	58.8	68.0\n\
20111005	64.2	58.7	72.4\n\
20111006	58.8	57.0	77.0\n\
20111007	57.9	56.7	82.3\n\
20111008	61.8	56.8	78.9\n\
20111009	69.3	56.7	68.8\n\
20111010	71.2	60.1	68.7\n\
20111011	68.7	61.1	70.3\n\
20111012	61.8	61.5	75.3\n\
20111013	63.0	64.3	76.6\n\
20111014	66.9	67.1	66.6\n\
20111015	61.7	64.6	68.0\n\
20111016	61.8	61.6	70.6\n\
20111017	62.8	61.1	71.1\n\
20111018	60.8	59.2	70.0\n\
20111019	62.1	58.9	61.6\n\
20111020	65.1	57.2	57.4\n\
20111021	55.6	56.4	64.3\n\
20111022	54.4	60.7	72.4\n";

    var margin = {
        top: 20,
        right: 80,
        bottom: 30,
        left: 50
      },
      width = 500 - margin.left - margin.right,
      height = 500 - margin.top - margin.bottom;

    var parseDate = d3.time.format("%Y%m%d").parse;

    var x = d3.time.scale()
      .range([0, width]);

    var y = d3.scale.linear()
      .range([height, 0]);

    var color = d3.scale.category20();

    var xAxis = d3.svg.axis()
      .scale(x)
      .orient("bottom");

    var yAxis = d3.svg.axis()
      .scale(y)
      .orient("left");

    var line = d3.svg.line()
      .interpolate("basis")
      .x(function(d) {
        return x(d.date);
      })
      .y(function(d) {
        return y(d.temperature);
      });

    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 data = d3.tsv.parse(myData);

    color.domain(d3.keys(data[0]).filter(function(key) {
      return key !== "date";
    }));

    data.forEach(function(d) {
      d.date = parseDate(d.date);
    });

    var cities = color.domain().map(function(name) {
      return {
        name: name,
        values: data.map(function(d) {
          return {
            date: d.date,
            temperature: +d[name]
          };
        })
      };
    });

    x.domain(d3.extent(data, function(d) {
      return d.date;
    }));

    y.domain([
      d3.min(cities, function(c) {
        return d3.min(c.values, function(v) {
          return v.temperature;
        });
      }),
      d3.max(cities, function(c) {
        return d3.max(c.values, function(v) {
          return v.temperature;
        });
      })
    ]);

    var legend = svg.selectAll('g')
      .data(cities)
      .enter()
      .append('g')
      .attr('class', 'legend');

    legend.append('rect')
      .attr('x', width - 20)
      .attr('y', function(d, i) {
        return i * 20;
      })
      .attr('width', 10)
      .attr('height', 10)
      .style('fill', function(d) {
        return color(d.name);
      });

    legend.append('text')
      .attr('x', width - 8)
      .attr('y', function(d, i) {
        return (i * 20) + 9;
      })
      .text(function(d) {
        return d.name;
      });

    svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

    svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
      .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Temperature (ºF)");

    var city = svg.selectAll(".city")
      .data(cities)
      .enter().append("g")
      .attr("class", "city");

    city.append("path")
      .attr("class", "line")
      .attr("d", function(d) {
        return line(d.values);
      })
      .style("stroke", function(d) {
        return color(d.name);
      });

    city.append("text")
      .datum(function(d) {
        return {
          name: d.name,
          value: d.values[d.values.length - 1]
        };
      })
      .attr("transform", function(d) {
        return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")";
      })
      .attr("x", 3)
      .attr("dy", ".35em")
      .text(function(d) {
        return d.name;
      });

    var mouseG = svg.append("g")
      .attr("class", "mouse-over-effects");

    mouseG.append("path") // this is the black vertical line to follow mouse
      .attr("class", "mouse-line")
      .style("stroke", "black")
      .style("stroke-width", "1px")
      .style("opacity", "0");

    var lines = document.getElementsByClassName('line');

    var mousePerLine = mouseG.selectAll('.mouse-per-line')
      .data(cities)
      .enter()
      .append("g")
      .attr("class", "mouse-per-line");

     // mousePerLine.append("circle")
     //   .attr("r", 7)
     //   .style("stroke", function(d) {
     //     return color(d.name);
     //   })
     //   .style("fill", "none")
     //   .style("stroke-width", "1px")
     //   .style("opacity", "0");

    mousePerLine.append("rect")
      .attr("width", 50)
      .attr("height", 50)
      .style("stroke", function(d) {
        return color(d.name);
      })
      .style("fill", function(d) {
        return color(d.name);
      })
      .style("stroke-width", "1px")
      .style("opacity", "0");

    mousePerLine.append("text")
      .attr("transform", "translate(10,3)");

    mouseG.append('svg:rect') // append a rect to catch mouse movements on canvas
      .attr('width', width) // can't catch mouse events on a g element
      .attr('height', height)
      .attr('fill', 'none')
      .attr('pointer-events', 'all')
      .on('mouseout', function() { // on mouse out hide line, circles and text
        d3.select(".mouse-line")
          .style("opacity", "0");
        // d3.selectAll(".mouse-per-line circle")
        //   .style("opacity", "0");
        d3.selectAll(".mouse-per-line rect")
          .style("opacity", "0");
        d3.selectAll(".mouse-per-line text")
          .style("opacity", "0");
      })
      .on('mouseover', function() { // on mouse in show line, circles and text
        d3.select(".mouse-line")
          .style("opacity", "1");
        // d3.selectAll(".mouse-per-line circle")
        //   .style("opacity", "1");
        d3.selectAll(".mouse-per-line rect")
          .style("opacity", "1");
        d3.selectAll(".mouse-per-line text")
          .style("opacity", "1");
      })
      .on('mousemove', function() { // mouse moving over canvas
        var mouse = d3.mouse(this);
        d3.select(".mouse-line")
          .attr("d", function() {
            var d = "M" + mouse[0] + "," + height;
            d += " " + mouse[0] + "," + 0;
            return d;
          });

        d3.selectAll(".mouse-per-line")
          .attr("transform", function(d, i) {
            console.log(width / mouse[0])
            var xDate = x.invert(mouse[0]),
              bisect = d3.bisector(function(d) {
                return d.date;
              }).right;
            idx = bisect(d.values, xDate);

            var beginning = 0,
              end = lines[i].getTotalLength(),
              target = null;

            while (true) {
              target = Math.floor((beginning + end) / 2);
              pos = lines[i].getPointAtLength(target);
              if ((target === end || target === beginning) && pos.x !== mouse[0]) {
                break;
              }
              if (pos.x > mouse[0]) end = target;
              else if (pos.x < mouse[0]) beginning = target;
              else break; //position found
            }

            d3.select(this).select('text')
              .text(y.invert(pos.y).toFixed(2));

            return "translate(" + mouse[0] + "," + pos.y + ")";
          });
      });
  </script>
</body>

</html>

Hello, I am trying to draw a Stacked Area chart using D3. Till now I am able to draw the chart successfully and on mouseover the chart displays a rectangle and the corresponding data value above the rectangle. But I want to display the data value inside the rectangle rather than outside the rectangle on mouseover. What am I doing wrong in this. Please help me. I am stuck. Thanks for any help in advance.

Upvotes: 0

Answers (1)

Cyril Cherian

Reputation: 32327

You can position the text by translating it:

So you can change:

mousePerLine.append("text")
      .attr("transform", "translate(10,3)");

To this:

mousePerLine.append("text")
      .attr("transform", "translate(10,13)");//this will move 10 points down

working code here

Upvotes: 3

Show the tooltip value inside the &quot;rect&quot; on mouseover in d3 stacked area chart

Answers (1)

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Show the tooltip value inside the "rect" on mouseover in d3 stacked area chart