This example shows how to customize the appearance of d3-axis using post-selection: modifying the contents of the SVG elements created by the axis. This technique can also be applied during transitions.
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January 16, 2020 09:06
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Axis Styling
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/styled-axes |
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| <!DOCTYPE html> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| margin = {top: 20, right: 0, bottom: 20, left: 0}, | |
| width = +svg.attr("width") - margin.left - margin.right, | |
| height = +svg.attr("height") - margin.top - margin.bottom, | |
| g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var formatNumber = d3.format(".1f"); | |
| var x = d3.scaleTime() | |
| .domain([new Date(2010, 7, 1), new Date(2012, 7, 1)]) | |
| .range([0, width]); | |
| var y = d3.scaleLinear() | |
| .domain([0, 2e6]) | |
| .range([height, 0]); | |
| var xAxis = d3.axisBottom(x) | |
| .ticks(d3.timeYear); | |
| var yAxis = d3.axisRight(y) | |
| .tickSize(width) | |
| .tickFormat(function(d) { | |
| var s = formatNumber(d / 1e6); | |
| return this.parentNode.nextSibling | |
| ? "\xa0" + s | |
| : "$" + s + " million"; | |
| }); | |
| g.append("g") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(customXAxis); | |
| g.append("g") | |
| .call(customYAxis); | |
| function customXAxis(g) { | |
| g.call(xAxis); | |
| g.select(".domain").remove(); | |
| } | |
| function customYAxis(g) { | |
| g.call(yAxis); | |
| g.select(".domain").remove(); | |
| g.selectAll(".tick:not(:first-of-type) line").attr("stroke", "#777").attr("stroke-dasharray", "2,2"); | |
| g.selectAll(".tick text").attr("x", 4).attr("dy", -4); | |
| } | |
| </script> |
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