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November 21, 2018 01:52
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| license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| // Feel free to change or delete any of the code you see in this editor! | |
| const names = ['Andy', 'Beth', 'Craig', 'Diane', 'Evelyn', 'Fred', 'Georgia', 'Harry', 'Isabel', 'John'] | |
| const myData = [ | |
| { | |
| 'name': 'Andy', | |
| 'score': 37 | |
| }, | |
| { | |
| 'name': 'Beth', | |
| 'score': 39 | |
| }, | |
| { | |
| 'name': 'Craig', | |
| 'score': 31 | |
| }, | |
| { | |
| 'name': 'Diane', | |
| 'score': 35 | |
| }, | |
| { | |
| 'name': 'Evelyn', | |
| 'score': 38 | |
| } | |
| ] | |
| const svg = d3.select('#wrapper') | |
| .append('svg') | |
| .attr('width', 500) | |
| .attr('height', 200) | |
| const barMax = 400 | |
| const barScale = d3.scaleLinear() | |
| .domain([0, 100]) | |
| .range([0, barMax]) | |
| const randomInt = () => { | |
| return Math.floor(10 * Math.random()) | |
| } | |
| updateScores = () => { | |
| const updatedData = myData.map( d => { | |
| d.score = 30 + randomInt() | |
| return d | |
| }) | |
| updateBars(updatedData) | |
| } | |
| addPerson = () => { | |
| if (myData.length === 10) { | |
| return | |
| } | |
| myData.push({ | |
| name: names[myData.length], | |
| score: 30 + randomInt() | |
| }) | |
| // adds a new object to the end of the array | |
| updateBars(myData) | |
| } | |
| removePerson = () => { | |
| if (myData.length === 0) { | |
| return | |
| } | |
| myData.pop() // removes element at the end of the array | |
| updateBars(myData) | |
| } | |
| updateBars = (data) => { | |
| const bars = svg.selectAll('rect') | |
| .data(data) | |
| bars.enter() | |
| .append('rect') | |
| .attr('fill', 'steelblue') // you can also set the color with a class | |
| .attr('width', d => barScale(d.score)) | |
| .attr('height', 20) | |
| .attr('y', (d, i) => i * 22) | |
| .attr('x', d => 0) | |
| .merge(bars) | |
| // .transition() | |
| // .duration(1000) | |
| .attr('width', d => barScale(d.score)) | |
| bars.exit() | |
| // .transition() | |
| // .duration(1000) | |
| .remove() | |
| // .append('rect') | |
| console.log(bars) | |
| } | |
| // initializeData() | |
| updateBars(myData) | |
| </script> | |
| </body> |
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