This demonstrates how to place values and labels between tick marks along the x-axis using D3.js.
View and run the code at https://bl.ocks.org/ecgan/6da307ac465745bfc801850f4c1b57c6.
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January 8, 2018 09:03
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Placing x-axis values and labels between tick marks
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| license: gpl-3.0 |
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| [ | |
| { | |
| "value": 10, | |
| "startDate": "2018-01-01", | |
| "endDate": "2018-01-07", | |
| "week": "Week 1" | |
| }, { | |
| "value": 5, | |
| "startDate": "2018-01-08", | |
| "endDate": "2018-01-14", | |
| "week": "Week 2" | |
| }, { | |
| "value": 15, | |
| "startDate": "2018-01-15", | |
| "endDate": "2018-01-21", | |
| "week": "Week 3" | |
| }, { | |
| "value": 45, | |
| "startDate": "2018-01-22", | |
| "endDate": "2018-01-29", | |
| "week": "Week 4" | |
| }, { | |
| "value": 85, | |
| "startDate": "2018-01-29", | |
| "endDate": "2018-02-04", | |
| "week": "Week 5" | |
| }, { | |
| "value": 70, | |
| "startDate": "2018-02-05", | |
| "endDate": "2018-02-11", | |
| "week": "Week 6" | |
| }, { | |
| "value": 15, | |
| "startDate": "2018-02-12", | |
| "endDate": "2018-02-18", | |
| "week": "Week 7" | |
| }, { | |
| "value": 40, | |
| "startDate": "2018-02-19", | |
| "endDate": "2018-02-25", | |
| "week": "Week 8" | |
| }, { | |
| "value": 25, | |
| "startDate": "2018-02-26", | |
| "endDate": "2018-03-04", | |
| "week": "Week 9" | |
| }, { | |
| "value": 30, | |
| "startDate": "2018-03-05", | |
| "endDate": "2018-03-11", | |
| "week": "Week 10" | |
| } | |
| ] |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| .graph .line { | |
| fill: none; | |
| stroke: #CC0000; | |
| stroke-width: 3; | |
| } | |
| .graph #xAxisWeek .tick.midWeek line { | |
| display: none; | |
| } | |
| .graph #xAxisWeek .tick.endWeek text { | |
| display: none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="graph"> | |
| <svg width="960" height="500"></svg> | |
| </div> | |
| <script> | |
| let svg = d3.select("svg"); | |
| let margin = {top: 20, right: 20, bottom: 30, left: 40}; | |
| let width = svg.attr("width") - margin.left - margin.right; | |
| let height = svg.attr("height") - margin.top - margin.bottom; | |
| let g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| d3.json('data.json', (error, data) => { | |
| if (error) throw error; | |
| // massage data. | |
| let graphData = data.map((item) => { | |
| let start = new Date(item.startDate + 'T00:00:00'); | |
| let end = new Date(item.endDate + 'T24:00:00'); | |
| let mid = new Date((start.getTime() + end.getTime()) / 2); | |
| return { | |
| x: item.week, | |
| y: item.value, | |
| startDate: start, | |
| endDate: end, | |
| midDate: mid | |
| }; | |
| }); | |
| // create scales based on data. | |
| let yScale = d3.scaleLinear() | |
| .rangeRound([height, 0]) | |
| .domain([0, 100]) | |
| .nice(); | |
| let xScale = d3.scaleTime() | |
| .domain([ | |
| new Date(graphData[0].startDate), | |
| new Date(graphData[graphData.length-1].endDate) | |
| ]) | |
| .rangeRound([0, width]) | |
| .clamp(true); | |
| let lineGenerator = d3.line() | |
| .x((d) => { return xScale(d.midDate); }) | |
| .y((d) => { return yScale(d.y); }) | |
| .curve(d3.curveLinear); | |
| // generate linear graph. | |
| g.append('g') | |
| .attr('id', 'line') | |
| .append('path') | |
| .datum(graphData) | |
| .attr('class', 'line') | |
| .attr('d', lineGenerator); | |
| // generate y-axis. | |
| let yAxis = d3.axisLeft(yScale); | |
| g.append('g') | |
| .attr('id', 'yAxis') | |
| .call(yAxis); | |
| // generate x-axis. | |
| let tickValues = graphData | |
| .map((value) => [value.midDate, value.endDate]) | |
| .reduce((acc, cur) => { | |
| return acc.concat(cur); | |
| }, []); | |
| let xAxisWeekGenerator = d3.axisBottom(xScale) | |
| .tickValues(tickValues) | |
| .tickSize(10) | |
| .tickPadding(5) | |
| .tickFormat((d, i) => { | |
| let index = Math.floor(i / 2); | |
| return graphData[index].x; | |
| }); | |
| let xAxisWeekUi = g.append('g') | |
| .attr('id', 'xAxisWeek') | |
| .attr('transform', `translate(0, ${height})`) | |
| .call(xAxisWeekGenerator); | |
| xAxisWeekUi.selectAll('.tick') | |
| .attr('class', (d, i) => { | |
| if (i % 2 === 0) { | |
| return 'tick midWeek'; | |
| } | |
| return 'tick endWeek'; | |
| }); | |
| }); | |
| </script> | |
| </body> |
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