[英]exporting data from datatable with canvas and chart.js to excel
[英]Import data from Excel and use in Chart.js
好吧,我最近学会了如何使用标签canvas渲染html图形。 但是手动填写数据有些麻烦……我想知道是否有可能仅使用JavaScript从Excel电子表格中直接获取这些数据。 到目前为止,这是我的代码...
<div> <canvas class="line-chart"></canvas> <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script> <script> var ctx = document.getElementsByClassName("line-chart"); var dia = ["Dia 1", "Dia 2", "Dia 3", "Dia 4", "Dia 5", "Dia 6"]; //Seta os dias var real = [60,30,65,59,58,49]; //Seta os dados do grafico 1 var meta = [30,45,62,47,55,11]; //Seta os dados do grafico 2 //Type, data, options var chartGraph = new Chart (ctx, { type: 'line', //line, bar, radar, doughnut (pizza), polarArea data: { labels: dia, datasets: [{ label: "OEE Real (%) ", data: real, borderWidth: 6, borderColor: 'rgba(146,242,42,0.85)', background: 'transparent', }, { label: "OEE Meta (%)", data: meta, borderWidth: 6, borderColor: 'rgba(207,0,15,0.85)', background: 'transparent', }, ]}, options: { title: { display: true, fontSize: 20, text: "ENCARTUCHAMENTO 05" }, scales: { yAxes: [{ ticks: { max: 100, min: 0, } }] }, } }); </script> </div>
最简单的方法是使用chartjs-plugin-datasource ,它利用SheetJS(js-xlsx) 。
将以下excel文件另存为与HTML文件位于同一目录中的mydata.xlsx
。
+--------------+-------+-------+-------+-------+-------+-------+
| | Dia 1 | Dia 2 | Dia 3 | Dia 4 | Dia 5 | Dia 6 |
+--------------+-------+-------+-------+-------+-------+-------+
| OEE Real (%) | 60 | 30 | 65 | 59 | 58 | 49 |
+--------------+-------+-------+-------+-------+-------+-------+
| OEE Meta (%) | 30 | 45 | 62 | 47 | 55 | 11 |
+--------------+-------+-------+-------+-------+-------+-------+
然后,在脚本中指定它。
<script src="https://cdn.jsdelivr.net/npm/chart.js@2.8.0"></script>
<script src="https://cdn.jsdelivr.net/npm/xlsx@0.14.3/dist/xlsx.full.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datasource@0.1.0"></script>
<div>
<canvas class="line-chart"></canvas>
</div>
<script>
var ctx = document.getElementsByClassName("line-chart");
//Type, data, options
var chartGraph = new Chart (ctx, {
type: 'line',
data: {
datasets: [{
borderWidth: 6,
borderColor: 'rgba(146, 242, 42, 0.85)',
fill: false
}, {
borderWidth: 6,
borderColor: 'rgba(207, 0, 15, 0.85)',
fill: false
}
]},
plugins: [ChartDataSource],
options: {
title: {
display: true,
fontSize: 20,
text: 'ENCARTUCHAMENTO 05'
},
scales: {
yAxes: [{
ticks: {
max: 100,
min: 0,
}
}]
},
plugins: {
datasource: {
url: 'mydata.xlsx'
}
}
}
});
</script>
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