A simple bar chart build using data from an external JSON file.
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December 14, 2022 21:11
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Bar chart from external JSON file
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| [ | |
| { | |
| "Letter": "A", | |
| "Freq": 20 | |
| }, | |
| { | |
| "Letter" : "B", | |
| "Freq": 12 | |
| }, | |
| { | |
| "Letter" : "C", | |
| "Freq": 47 | |
| }, | |
| { | |
| "Letter" : "D", | |
| "Freq": 34 | |
| }, | |
| { | |
| "Letter" : "E", | |
| "Freq" : 54 | |
| }, | |
| { | |
| "Letter" : "F", | |
| "Freq" : 21 | |
| }, | |
| { | |
| "Letter" : "G", | |
| "Freq" : 57 | |
| }, | |
| { | |
| "Letter" : "H", | |
| "Freq" : 31 | |
| }, | |
| { | |
| "Letter" : "I", | |
| "Freq" : 17 | |
| }, | |
| { | |
| "Letter" : "J", | |
| "Freq" : 5 | |
| }, | |
| { | |
| "Letter" : "K", | |
| "Freq" : 23 | |
| }, | |
| { | |
| "Letter" : "L", | |
| "Freq" : 39 | |
| }, | |
| { | |
| "Letter" : "M", | |
| "Freq" : 29 | |
| }, | |
| { | |
| "Letter" : "N", | |
| "Freq" : 33 | |
| }, | |
| { | |
| "Letter" : "O", | |
| "Freq" : 18 | |
| }, | |
| { | |
| "Letter" : "P", | |
| "Freq" : 35 | |
| }, | |
| { | |
| "Letter" : "Q", | |
| "Freq" : 11 | |
| }, | |
| { | |
| "Letter" : "R", | |
| "Freq" : 45 | |
| }, | |
| { | |
| "Letter" : "S", | |
| "Freq" : 43 | |
| }, | |
| { | |
| "Letter" : "T", | |
| "Freq" : 28 | |
| }, | |
| { | |
| "Letter" : "U", | |
| "Freq" : 26 | |
| }, | |
| { | |
| "Letter" : "V", | |
| "Freq" : 30 | |
| }, | |
| { | |
| "Letter" : "X", | |
| "Freq" : 5 | |
| }, | |
| { | |
| "Letter" : "Y", | |
| "Freq" : 4 | |
| }, | |
| { | |
| "Letter" : "Z", | |
| "Freq" : 2 | |
| } | |
| ] |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <style> | |
| .bar{ | |
| fill: steelblue; | |
| } | |
| .bar:hover{ | |
| fill: brown; | |
| } | |
| .axis { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| // set the dimensions of the canvas | |
| var margin = {top: 20, right: 20, bottom: 70, left: 40}, | |
| width = 600 - margin.left - margin.right, | |
| height = 300 - margin.top - margin.bottom; | |
| // set the ranges | |
| var x = d3.scale.ordinal().rangeRoundBands([0, width], .05); | |
| var y = d3.scale.linear().range([height, 0]); | |
| // define the axis | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom") | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left") | |
| .ticks(10); | |
| // add the SVG element | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", | |
| "translate(" + margin.left + "," + margin.top + ")"); | |
| // load the data | |
| d3.json("data.json", function(error, data) { | |
| data.forEach(function(d) { | |
| d.Letter = d.Letter; | |
| d.Freq = +d.Freq; | |
| }); | |
| // scale the range of the data | |
| x.domain(data.map(function(d) { return d.Letter; })); | |
| y.domain([0, d3.max(data, function(d) { return d.Freq; })]); | |
| // add axis | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis) | |
| .selectAll("text") | |
| .style("text-anchor", "end") | |
| .attr("dx", "-.8em") | |
| .attr("dy", "-.55em") | |
| .attr("transform", "rotate(-90)" ); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis) | |
| .append("text") | |
| .attr("transform", "rotate(-90)") | |
| .attr("y", 5) | |
| .attr("dy", ".71em") | |
| .style("text-anchor", "end") | |
| .text("Frequency"); | |
| // Add bar chart | |
| svg.selectAll("bar") | |
| .data(data) | |
| .enter().append("rect") | |
| .attr("class", "bar") | |
| .attr("x", function(d) { return x(d.Letter); }) | |
| .attr("width", x.rangeBand()) | |
| .attr("y", function(d) { return y(d.Freq); }) | |
| .attr("height", function(d) { return height - y(d.Freq); }); | |
| }); | |
| </script> | |
| </body> |
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can help me on multi data bar chart