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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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.bar { |
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fill: steelblue; |
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} |
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.bar:hover { |
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fill: brown; |
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} |
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.axis--x path { |
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display: none; |
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} |
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svg { |
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position: absolute; |
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margin-top: 40px; |
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} |
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select { |
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margin-left: 60px; |
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} |
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</style> |
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<body> |
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<select id="filter"> |
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<option value="1">1</option> |
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<option value="2">2</option> |
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</select> |
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<svg width="960" height="500"></svg> |
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</body> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<script> |
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var svg = d3.select("svg"), |
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margin = {top: 20, right: 20, bottom: 30, left: 40}, |
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width = +svg.attr("width") - margin.left - margin.right, |
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height = +svg.attr("height") - margin.top - margin.bottom; |
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var x = d3.scaleBand().rangeRound([0, width]).padding(0.1), |
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y = d3.scaleLinear().rangeRound([height, 0]); |
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var g = svg.append("g") |
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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// create a variable that will hold the loaded data |
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var tsv; |
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// load the data |
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d3.tsv("data.tsv", function(d) { |
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d.frequency = +d.frequency; |
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return d; |
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}, function(error, datafile) { |
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if (error) throw error; |
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// put the original data in tsv |
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tsv = datafile; |
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// filter the data based on the inital value |
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var data = tsv.filter(function(d) { |
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var sq = d3.select("#filter").property("value"); |
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return d.group === sq; |
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}); |
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// set the domains of the axes |
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x.domain(data.map(function(d) { return d.letter; })); |
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y.domain([0, d3.max(data, function(d) { return d.frequency; })]); |
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// add the svg elements |
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g.append("g") |
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.attr("class", "axis axis--x") |
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.attr("transform", "translate(0," + height + ")") |
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.call(d3.axisBottom(x)); |
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g.append("g") |
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.attr("class", "axis axis--y") |
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.call(d3.axisLeft(y).ticks(10, "%")) |
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.append("text") |
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.attr("transform", "rotate(-90)") |
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.attr("y", 6) |
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.attr("dy", "0.71em") |
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.attr("text-anchor", "end") |
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.text("Frequency"); |
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// create the bars |
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g.selectAll(".bar") |
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.data(data) |
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.enter().append("rect") |
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.attr("class", "bar") |
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.attr("x", function(d) { return x(d.letter); }) |
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.attr("y", function(d) { return y(d.frequency); }) |
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.attr("width", x.bandwidth()) |
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.attr("height", function(d) { return height - y(d.frequency); }); |
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// add a change event handler |
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d3.select("#filter").on("change", function() { |
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applyFilter(this.value); |
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}); |
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// call this whenever the filter changes |
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function applyFilter(value) { |
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// filter the data |
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var data = tsv.filter(function(d) {return d.group === value;}) |
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// update the bars |
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d3.selectAll(".bar") |
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.data(data) |
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.transition().duration(1000) |
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.attr("x", function(d) { return x(d.letter); }) |
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.attr("y", function(d) { return y(d.frequency); }) |
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.attr("height", function(d) { return height - y(d.frequency); }); |
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} |
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}); |
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</script> |
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