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Last active February 4, 2024 22:31
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Simple bar graph in v4
license: mit

This is a simple bar graph written using d3.js v4.

This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.

<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
.bar { fill: steelblue; }
</style>
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// set the ranges
var x = d3.scaleBand()
.range([0, width])
.padding(0.1);
var y = d3.scaleLinear()
.range([height, 0]);
// append the svg object to the body of the page
// append a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");
// 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;
});
// Scale the range of the data in the domains
x.domain(data.map(function(d) { return d.salesperson; }));
y.domain([0, d3.max(data, function(d) { return d.sales; })]);
// append the rectangles for the bar chart
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x(d.salesperson); })
.attr("width", x.bandwidth())
.attr("y", function(d) { return y(d.sales); })
.attr("height", function(d) { return height - y(d.sales); });
// add the x Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// add the y Axis
svg.append("g")
.call(d3.axisLeft(y));
});
</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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