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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> /* set the CSS */ |
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.line { |
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fill: none; |
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stroke: steelblue; |
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stroke-width: 2px; |
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} |
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div.tooltip { |
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position: absolute; |
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text-align: center; |
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width: 60px; |
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height: 28px; |
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padding: 2px; |
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font: 12px sans-serif; |
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background: lightsteelblue; |
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border: 0px; |
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border-radius: 8px; |
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pointer-events: none; |
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} |
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</style> |
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<body> |
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<!-- load the d3.js library --> |
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<script src="https://d3js.org/d3.v5.min.js"></script> |
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<script> |
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// set the dimensions and margins of the graph |
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var margin = {top: 20, right: 20, bottom: 30, left: 50}, |
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width = 960 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom; |
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// parse the date / time |
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var parseTime = d3.timeParse("%d-%b-%y"); |
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var formatTime = d3.timeFormat("%e %B"); |
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// set the ranges |
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var x = d3.scaleTime().range([0, width]); |
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var y = d3.scaleLinear().range([height, 0]); |
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// define the line |
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var valueline = d3.line() |
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.x(function(d) { return x(d.date); }) |
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.y(function(d) { return y(d.close); }); |
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var div = d3.select("body").append("div") |
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.attr("class", "tooltip") |
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.style("opacity", 0); |
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// append the svg obgect to the body of the page |
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// appends a 'group' element to 'svg' |
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// moves the 'group' element to the top left margin |
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var svg = d3.select("body").append("svg") |
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.attr("width", width + margin.left + margin.right) |
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.attr("height", height + margin.top + margin.bottom) |
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.append("g") |
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.attr("transform", |
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"translate(" + margin.left + "," + margin.top + ")"); |
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// Get the data |
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d3.csv("data.csv").then(function(data) { |
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// format the data |
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data.forEach(function(d) { |
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d.date = parseTime(d.date); |
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d.close = +d.close; |
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}); |
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// scale the range of the data |
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x.domain(d3.extent(data, function(d) { return d.date; })); |
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y.domain([0, d3.max(data, function(d) { return d.close; })]); |
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// add the valueline path. |
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svg.append("path") |
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.data([data]) |
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.attr("class", "line") |
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.attr("d", valueline); |
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// add the dots with tooltips |
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svg.selectAll("dot") |
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.data(data) |
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.enter().append("circle") |
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.attr("r", 5) |
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.attr("cx", function(d) { return x(d.date); }) |
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.attr("cy", function(d) { return y(d.close); }) |
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.on("mouseover", function(d) { |
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div.transition() |
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.duration(200) |
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.style("opacity", .9); |
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div.html(formatTime(d.date) + "<br/>" + d.close) |
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.style("left", (d3.event.pageX) + "px") |
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.style("top", (d3.event.pageY - 28) + "px"); |
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}) |
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.on("mouseout", function(d) { |
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div.transition() |
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.duration(500) |
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.style("opacity", 0); |
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}); |
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// add the X Axis |
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svg.append("g") |
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.attr("transform", "translate(0," + height + ")") |
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.call(d3.axisBottom(x)); |
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// add the Y Axis |
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svg.append("g") |
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.call(d3.axisLeft(y)); |
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}); |
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</script> |
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</body> |
