Simple example using D3 to create a bar chart of some randomly generated data
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May 14, 2021 16:58
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Simple bar chart (Data: randomly generated)
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| license: mit | |
| border: no |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>D3 example</title> | |
| <script src="//d3js.org/d3.v4.min.js" charset="utf-8"></script> | |
| <style> | |
| .bar { | |
| fill: red; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <input type="button" onclick="update()" value="Update"/> | |
| <div id="vis"> | |
| </div> | |
| <script src="script.js"></script> | |
| </body> | |
| </html> | |
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| function createRandomData() { | |
| var numDataItems = Math.floor((Math.random() * 10) + 1); | |
| var d = []; | |
| for(var i = 0; i < numDataItems; i++) { | |
| d.push(Math.floor((Math.random() * 50) + 1)); | |
| } | |
| return d; | |
| } | |
| var width = 500; | |
| var height = 500; | |
| var svg = d3.select('#vis') | |
| .append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| function update() { | |
| var exampleData = createRandomData(); | |
| console.log(exampleData); | |
| var bars = svg.selectAll('.bar') | |
| .data(exampleData); | |
| bars | |
| .exit() | |
| .remove() | |
| var new_bars = bars | |
| .enter() | |
| .append('rect') | |
| .attr('class', 'bar') | |
| .attr('height', '20px') | |
| .attr('x', 0); | |
| new_bars.merge(bars) | |
| .attr('width', function(d){ return d*10 + 'px'; }) | |
| .attr('y', function(d, i){ return (i * 20) + i; }); | |
| } | |
| update(); |
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