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simple line chart from dataset
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| license: mit |
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| [{"name": "A", "value": 10, "date": "2016-01"}, | |
| {"name": "B", "value": 30, "date": "2016-02"}, | |
| {"name": "C", "value": 20, "date": "2016-03"}, | |
| {"name": "D", "value": 40, "date": "2016-04"}, | |
| {"name": "E", "value": 50, "date": "2016-05"}, | |
| {"name": "F", "value": 20, "date": "2016-06"}, | |
| {"name": "G", "value": 10, "date": "2016-07"} | |
| ] |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| .line { | |
| fill: none; | |
| stroke: black; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", 960) | |
| .attr("height", 500); | |
| var width = 800; | |
| var height = 400; | |
| // See formats http://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/ | |
| // Data sample {"name": "G", "value": 10, "date": "2016-07"} | |
| var parseDate = d3.timeParse("%Y-%m"); | |
| var displayDate = d3.timeFormat("%b %y"); | |
| var displayValue = d3.format(",.0f"); | |
| // Ordinal scale | |
| var x = d3.scaleTime() | |
| .range([0, width]); | |
| // Linear scale | |
| var y = d3.scaleLinear() | |
| .range([height, height - 200]); | |
| var line = d3.line() | |
| .x(function(d) { return x(d.date); }) | |
| .y(function(d) { return y(d.value); }); | |
| var g = svg.append("g") | |
| .attr("transform", "translate(50, 0)") | |
| d3.json("dataset.json", function(error, data) { | |
| if (error) throw error; | |
| // Pre-processing | |
| data.forEach(function(d) { | |
| d.value = +d.value; | |
| d["date"] = parseDate(d["date"]); | |
| }); | |
| x.domain(d3.extent(data, function(d) { return d.date; })); | |
| y.domain([0, d3.max(data, function(d) { return d.value; })]); | |
| svg.selectAll(".label").data(data).enter() | |
| .append("text") | |
| .attr("class", "label") | |
| .text(function(d, i) { return displayDate(d.date); }) | |
| .attr("y", 420) | |
| .attr("x", function(d) { return x(d.date); }) | |
| .style("font-size", 10) | |
| .style("font-family", "monospace"); | |
| // Display last value | |
| g.selectAll(".value").data([data[data.length -1]]).enter() | |
| .append("text") | |
| .text(function(d, i) { return displayValue(d.value); }) | |
| .attr("class", "value") | |
| .attr("y", function(d) { return y(d.value); }) | |
| .attr("x", width + 10) | |
| .style("font-size", 20) | |
| .style("font-family", "monospace"); | |
| g.selectAll(".line").data([data]).enter().append("path") | |
| .attr("class", "line") | |
| .attr("d", line); | |
| }); | |
| </script> | |
| </body> |
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