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@kristw
Last active November 9, 2016 21:50
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Reusable bar graph (with d3Kit)
license: mit
<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
.chart { display: inline-block; vertical-align: top; }
.bar { fill: steelblue; }
</style>
<body>
<div class="chart" id="chart1"></div>
<div class="chart" id="chart2"></div>
<!-- load the d3.js library -->
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="https://unpkg.com/babel-core@5.8.38/browser.min.js"></script>
<script src="https://rawgit.com/twitter/d3kit/master/dist/d3kit.min.js"></script>
<script type="text/babel">
class BarChart extends d3Kit.SvgChart {
static getDefaultOptions() {
return d3Kit.helper.deepExtend(
super.getDefaultOptions(),
{
margin: {top: 20, right: 20, bottom: 30, left: 40},
initialWidth: 480,
initialHeight: 500,
}
);
}
constructor(selector, options) {
super(selector, options);
this.x = d3.scaleBand()
.padding(0.1);
this.y = d3.scaleLinear();
this.xAxis = this.rootG.append("g");
this.yAxis = this.rootG.append("g");
this.visualize = this.visualize.bind(this);
this.on('data', this.visualize);
}
visualize() {
this.x.range([0, this.getInnerWidth()])
this.y.range([this.getInnerHeight(), 0]);
const data = this.data();
if(data) {
// Scale the range of the data in the domains
this.x.domain(data.map(d => d.salesperson));
this.y.domain([0, d3.max(data, d => d.sales)]);
const selection = this.rootG.selectAll(".bar")
.data(data)
// append the rectangles for the bar chart
const sEnter = selection.enter().append("rect")
.attr("class", "bar")
// to make this component really reusable, we have to also update
selection.merge(sEnter)
.attr("x", d => this.x(d.salesperson))
.attr("width", this.x.bandwidth())
.attr("y", d => this.y(d.sales))
.attr("height", d => this.getInnerHeight() - this.y(d.sales));
// and exit
selection.exit().remove();
// draw the x Axis
this.xAxis
.attr("transform", "translate(0," + this.getInnerHeight() + ")")
.call(d3.axisBottom(this.x));
// draw the y Axis
this.yAxis
.call(d3.axisLeft(this.y));
}
}
}
const chart1 = new BarChart('#chart1')
// .width(300);
const chart2 = new BarChart('#chart2', {
margin: {top: 20, right: 20, bottom: 30, left: 40},
initialWidth: 240,
initialHeight: 250,
});
// get the data
d3.csv("sales.csv", function(error, data) {
if (error) throw error;
// format the data
data.forEach(function(d) {
d.sales = +d.sales;
});
chart1.data(data);
chart2.data(data);
});
</script>
</body>
salesperson sales
Bob 33
Robin 12
Anne 41
Mark 16
Joe 59
Eve 38
Karen 21
Kirsty 25
Chris 30
Lisa 47
Tom 5
Stacy 20
Charles 13
Mary 29
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