Chart.jsでグラフの表示 - JavaScript
https://github.com/chartjs/Chart.js/releases Chart.js.zip をダウンロードする
解凍したら、 Chart.min.js をプロジェクトに置く
. ├js/ │ ├lib/Chart.min.js │ └graph.js └index.html
index.html
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>Document</title> <script src="js/lib/Chart.min.js"></script> <style> .graph-container { width: 50%; } #myChart { width: 450; height: 450; } </style> </head> <body> <div class="graph-container"> <canvas id="myChart"></canvas> </div> <script src="js/graph.js"></script> </body> </html>
canvasをdivに入れないと、サイズを固定にできない
graph.js
createGraph(); function createGraph() { let ctx = document.getElementById('myChart'); let myChart = new Chart(ctx, { type: 'bar', data: { labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'], datasets: [{ label: '# of Votes', data: [12, 19, 3, 5, 2, 3], backgroundColor: [ 'rgba(255, 99, 132, 0.2)', 'rgba(54, 162, 235, 0.2)', 'rgba(255, 206, 86, 0.2)', 'rgba(75, 192, 192, 0.2)', 'rgba(153, 102, 255, 0.2)', 'rgba(255, 159, 64, 0.2)' ], borderColor: [ 'rgba(255,99,132,1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)', 'rgba(75, 192, 192, 1)', 'rgba(153, 102, 255, 1)', 'rgba(255, 159, 64, 1)' ], borderWidth: 1 }] }, options: { scales: { yAxes: [{ ticks: { beginAtZero: true } }] } } }); }
こんな簡単に表示できるものなの!?