This is a simple histogram 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.
forked from d3noob‘s block: Simple histogram using v4
<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
rect.bar { fill: steelblue; }
</style>
<body>
<!-- load the d3.js library -->
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {top: 10, right: 30, bottom: 30, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// parse the date / time
var parseDate = d3.timeParse("%d-%m-%Y");
// set the ranges
var x = d3.scaleTime()
.domain([new Date(2010, 6, 3), new Date(2012, 0, 1)])
.rangeRound([0, width]);
var y = d3.scaleLinear()
.range([height, 0]);
// set the parameters for the histogram
var histogram = d3.histogram()
.value(function(d) { return d.date; })
.domain(x.domain())
.thresholds(x.ticks(d3.timeMonth));
// 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("earthquakes.csv", function(error, data) {
if (error) throw error;
window.earthquakes = data
// format the data
data
.forEach(function(d) {
d.date = parseDate(d.dtg);
})
;
// group the data for the bars
var bins = histogram(data);
// Scale the range of the data in the y domain
y.domain([0, d3.max(bins, function(d) { return d.length; })]);
// append the bar rectangles to the svg element
svg.selectAll("rect")
.data(bins)
.enter().append("rect")
.attr("class", "bar")
.attr("x", 1)
.attr("transform", function(d) {
return "translate(" + x(d.x0) + "," + y(d.length) + ")"; })
.attr("width", function(d) { return x(d.x1) - x(d.x0) -1 ; })
.attr("height", function(d) { return height - y(d.length); });
// 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>