This simple bar chart is constructed from a TSV file storing the frequency of letters in the English language. The chart employs conventional margins and a number of D3 features:
| letter frequency | |
| "Total Cases, Guinea" 3804 | |
| "Total Cases, Liberia" 10675 | |
| "Total Cases, Sierra Leone" 14124 |
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .bar { | |
| fill: steelblue; | |
| } | |
| .bar:hover { | |
| fill: brown; | |
| } | |
| .axis { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script> | |
| var margin = {top: 20, right: 20, bottom: 30, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var x = d3.scale.ordinal() | |
| .rangeRoundBands([0, width], .1); | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left") | |
| .ticks(10, "%"); | |
| 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 + ")"); | |
| d3.tsv("data.tsv", type, function(error, data) { | |
| if (error) throw error; | |
| x.domain(data.map(function(d) { return d.letter; })); | |
| y.domain([0, d3.max(data, function(d) { return d.frequency; })]); | |
| 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("Frequency"); | |
| svg.selectAll(".bar") | |
| .data(data) | |
| .enter().append("rect") | |
| .attr("class", "bar") | |
| .attr("x", function(d) { return x(d.letter); }) | |
| .attr("width", x.rangeBand()) | |
| .attr("y", 470) | |
| .attr("height", function(d) {return height - 470;}) | |
| .transition().duration(1000) | |
| .attr("y", function(d) { return y(d.frequency); }) | |
| .attr("height", function(d) { return height - y(d.frequency); }); | |
| }); | |
| function type(d) { | |
| d.frequency = +d.frequency; | |
| return d; | |
| } | |
| </script> |