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Using D3 Dispatch to Link Multiple Views
Raw
index.html
<html>
<head>
<script src="https://d3js.org/d3.v7.min.js"></script>
<script src="iris_data.js"></script>
<title>Using D3 Dispatch to Link Charts</title>
</head>
<body>
<h1>
Iris Flower Data: Linked Bar Chart and Scatterplot
</h1>
<p>
We have data for 50 flowers of each species. This results in a bar chart with three equal sized bars (each representing
50 flowers of one species). Click on any species bar to see the corresponding data points highlighted in the scatterplot.
</p>
<div style="float:left;">
<b>Flower Count by Species</b><br/>
<svg id="bar" height="260" width="260"></svg>
</div>
<div>
<b>Petal Length vs Petal Width</b><br/>
<svg id="scatter" height="260" width="260"></svg>
</div>
<script>
class BarChart {
constructor(svg_id, data) {
this.dispatch = d3.dispatch("selectSpecies");
let g = d3.select("#"+svg_id).append('g').attr("transform", "translate(30,30)");
// Calculate counts by species.
let species = d3.rollup(data, group => group.length, d => d.species);
// Create scales.
let x = d3.scaleBand().domain(species.keys()).range([0, 200]).paddingInner(0.3).paddingOuter(0.1);
let y = d3.scaleLinear().domain([0, d3.max(species.values())]).range([200, 0]);
// Draw axes.
g.append("g")
.call(d3.axisLeft(y));
g.append("g")
.attr("transform", "translate(0,200)")
.call(d3.axisBottom(x));
// Draw bars
g.selectAll(".bar").data(species).join("rect")
.attr("class", "bar")
.attr("x", d => x(d[0]))
.attr("width", x.bandwidth())
.attr("y", d=> y(d[1]))
.attr("height", d => y(0)-y(d[1]))
.on("click", (event,d) => {
console.log("Calling...")
this.dispatch.call("selectSpecies", this, d[0])
})
.style("fill", "red");
}
}
class ScatterPlot {
constructor(svg_id, data) {
this.data = data;
let g = d3.select("#"+svg_id).append('g').attr("transform", "translate(30,30)");
let petal_width = data.map(d=>d.petal_width)
let petal_length = data.map(d=>d.petal_length)
let x = d3.scaleLinear().domain([d3.min(petal_width), d3.max(petal_width)]).range([0,200])
let y = d3.scaleLinear().domain([d3.min(petal_length), d3.max(petal_length)]).range([200,0])
// Draw axes
g.append("g")
.call(d3.axisLeft(y).ticks(5));
g.append("g")
.attr("transform", "translate(0,200)")
.call(d3.axisBottom(x).ticks(5));
// Draw axis labels
g.append("text")
.attr("x", -20)
.attr("y", -10)
.attr("text-anchor", "start")
.attr("font-size", "8")
.text("\u1403 Petal Length");
g.append("text")
.attr("x", 210)
.attr("y", 230)
.attr("text-anchor", "end")
.attr("font-size", "8")
.text("Petal Width \u1405");
// Draw data points.
g.selectAll(".dot").data(data).join("circle")
.attr("class", "dot")
.attr("cx", d => x(d.petal_width))
.attr("cy", d => y(d.petal_length))
.attr("r", 2)
.attr("fill", "black")
}
highlightSpecies(species) {
// Get matching data.
let matching_data = this.data.filter(d => d.species === species);
// Select matching circles, turn them red, and bring them to the front.
d3.selectAll(".dot").data(matching_data, d=>d.id).join(
enter => enter,
update => update.attr("fill", "red").raise(),
exit => exit.attr("fill", "black")
)
}
}
// Create the charts
let bar = new BarChart("bar", iris_data);
let scatter = new ScatterPlot("scatter", iris_data);
// Register the scatterplot as a listener for selectSpecies events on the bar chart.
bar.dispatch.on("selectSpecies", scatter.highlightSpecies.bind(scatter))
</script>
</body>
</html>
Raw
iris_data.js
var iris_data = [
{"id":101,"sepal_length":5.1,"sepal_width":3.5,"petal_length":1.4,"petal_width":0.2,"species":"setosa"},
{"id":102,"sepal_length":4.9,"sepal_width":3.0,"petal_length":1.4,"petal_width":0.2,"species":"setosa"},
{"id":103,"sepal_length":4.7,"sepal_width":3.2,"petal_length":1.3,"petal_width":0.2,"species":"setosa"},
{"id":104,"sepal_length":4.6,"sepal_width":3.1,"petal_length":1.5,"petal_width":0.2,"species":"setosa"},
{"id":105,"sepal_length":5.0,"sepal_width":3.6,"petal_length":1.4,"petal_width":0.2,"species":"setosa"},
{"id":106,"sepal_length":5.4,"sepal_width":3.9,"petal_length":1.7,"petal_width":0.4,"species":"setosa"},
{"id":107,"sepal_length":4.6,"sepal_width":3.4,"petal_length":1.4,"petal_width":0.3,"species":"setosa"},
{"id":108,"sepal_length":5.0,"sepal_width":3.4,"petal_length":1.5,"petal_width":0.2,"species":"setosa"},
{"id":109,"sepal_length":4.4,"sepal_width":2.9,"petal_length":1.4,"petal_width":0.2,"species":"setosa"},
{"id":110,"sepal_length":4.9,"sepal_width":3.1,"petal_length":1.5,"petal_width":0.1,"species":"setosa"},
{"id":111,"sepal_length":5.4,"sepal_width":3.7,"petal_length":1.5,"petal_width":0.2,"species":"setosa"},
{"id":112,"sepal_length":4.8,"sepal_width":3.4,"petal_length":1.6,"petal_width":0.2,"species":"setosa"},
{"id":113,"sepal_length":4.8,"sepal_width":3.0,"petal_length":1.4,"petal_width":0.1,"species":"setosa"},
{"id":114,"sepal_length":4.3,"sepal_width":3.0,"petal_length":1.1,"petal_width":0.1,"species":"setosa"},
{"id":115,"sepal_length":5.8,"sepal_width":4.0,"petal_length":1.2,"petal_width":0.2,"species":"setosa"},
{"id":116,"sepal_length":5.7,"sepal_width":4.4,"petal_length":1.5,"petal_width":0.4,"species":"setosa"},
{"id":117,"sepal_length":5.4,"sepal_width":3.9,"petal_length":1.3,"petal_width":0.4,"species":"setosa"},
{"id":118,"sepal_length":5.1,"sepal_width":3.5,"petal_length":1.4,"petal_width":0.3,"species":"setosa"},
{"id":119,"sepal_length":5.7,"sepal_width":3.8,"petal_length":1.7,"petal_width":0.3,"species":"setosa"},
{"id":120,"sepal_length":5.1,"sepal_width":3.8,"petal_length":1.5,"petal_width":0.3,"species":"setosa"},
{"id":121,"sepal_length":5.4,"sepal_width":3.4,"petal_length":1.7,"petal_width":0.2,"species":"setosa"},
{"id":122,"sepal_length":5.1,"sepal_width":3.7,"petal_length":1.5,"petal_width":0.4,"species":"setosa"},
{"id":123,"sepal_length":4.6,"sepal_width":3.6,"petal_length":1.0,"petal_width":0.2,"species":"setosa"},
{"id":124,"sepal_length":5.1,"sepal_width":3.3,"petal_length":1.7,"petal_width":0.5,"species":"setosa"},
{"id":125,"sepal_length":4.8,"sepal_width":3.4,"petal_length":1.9,"petal_width":0.2,"species":"setosa"},
{"id":126,"sepal_length":5.0,"sepal_width":3.0,"petal_length":1.6,"petal_width":0.2,"species":"setosa"},
{"id":127,"sepal_length":5.0,"sepal_width":3.4,"petal_length":1.6,"petal_width":0.4,"species":"setosa"},
{"id":128,"sepal_length":5.2,"sepal_width":3.5,"petal_length":1.5,"petal_width":0.2,"species":"setosa"},
{"id":129,"sepal_length":5.2,"sepal_width":3.4,"petal_length":1.4,"petal_width":0.2,"species":"setosa"},
{"id":130,"sepal_length":4.7,"sepal_width":3.2,"petal_length":1.6,"petal_width":0.2,"species":"setosa"},
{"id":131,"sepal_length":4.8,"sepal_width":3.1,"petal_length":1.6,"petal_width":0.2,"species":"setosa"},
{"id":132,"sepal_length":5.4,"sepal_width":3.4,"petal_length":1.5,"petal_width":0.4,"species":"setosa"},
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{"id":136,"sepal_length":5.0,"sepal_width":3.2,"petal_length":1.2,"petal_width":0.2,"species":"setosa"},
{"id":137,"sepal_length":5.5,"sepal_width":3.5,"petal_length":1.3,"petal_width":0.2,"species":"setosa"},
{"id":138,"sepal_length":4.9,"sepal_width":3.1,"petal_length":1.5,"petal_width":0.1,"species":"setosa"},
{"id":139,"sepal_length":4.4,"sepal_width":3.0,"petal_length":1.3,"petal_width":0.2,"species":"setosa"},
{"id":140,"sepal_length":5.1,"sepal_width":3.4,"petal_length":1.5,"petal_width":0.2,"species":"setosa"},
{"id":141,"sepal_length":5.0,"sepal_width":3.5,"petal_length":1.3,"petal_width":0.3,"species":"setosa"},
{"id":142,"sepal_length":4.5,"sepal_width":2.3,"petal_length":1.3,"petal_width":0.3,"species":"setosa"},
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];
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