Puede leer los datos de las hojas de cálculo de Google Sheets en JavaScript mediante el conector de hojas de RGraph:
https://www.rgraph.net/canvas/docs/import-data-from-google-sheets.html
Inicialmente (hace unos años) esto dependía de algunas funciones de RGraph para hacer su magia, pero ahora puede funcionar de forma independiente (es decir, no requiere la biblioteca común de RGraph).
Algún código de ejemplo (este ejemplo crea un gráfico RGraph):
<!-- Include the sheets library -->
<script src="RGraph.common.sheets.js"></script>
<!-- Include these two RGraph libraries to make the chart -->
<script src="RGraph.common.key.js"></script>
<script src="RGraph.bar.js"></script>
<script>
// Create a new RGraph Sheets object using the spreadsheet's key and
// the callback function that creates the chart. The RGraph.Sheets object is
// passed to the callback function as an argument so it doesn't need to be
// assigned to a variable when it's created
new RGraph.Sheets('1ncvARBgXaDjzuca9i7Jyep6JTv9kms-bbIzyAxbaT0E', function (sheet)
{
// Get the labels from the spreadsheet by retrieving part of the first row
var labels = sheet.get('A2:A7');
// Use the column headers (ie the names) as the key
var key = sheet.get('B1:E1');
// Get the data from the sheet as the data for the chart
var data = [
sheet.get('B2:E2'), // January
sheet.get('B3:E3'), // February
sheet.get('B4:E4'), // March
sheet.get('B5:E5'), // April
sheet.get('B6:E6'), // May
sheet.get('B7:E7') // June
];
// Create and configure the chart; using the information retrieved above
// from the spreadsheet
var bar = new RGraph.Bar({
id: 'cvs',
data: data,
options: {
backgroundGridVlines: false,
backgroundGridBorder: false,
xaxisLabels: labels,
xaxisLabelsOffsety: 5,
colors: ['#A8E6CF','#DCEDC1','#FFD3B6','#FFAAA5'],
shadow: false,
colorsStroke: 'rgba(0,0,0,0)',
yaxis: false,
marginLeft: 40,
marginBottom: 35,
marginRight: 40,
key: key,
keyBoxed: false,
keyPosition: 'margin',
keyTextSize: 12,
textSize: 12,
textAccessible: false,
axesColor: '#aaa'
}
}).wave();
});
</script>