Google Sheets chart - dynamic min max Y axis from data - google-sheets

Question

I have created a line chart in Google Sheets using data pulled from an API. The data changes every hour, so the min and max values of the data to chart also changes.
I would like to know if there is a script that can lookup up min and max from a column of data and use those values to dynamically set min/max for the Y axis.
Currently the only way I can see to change Y axis min max is manually in the chart editor, but the inputs only accept numbers, not formulas, so the min max is rigid.

Answer 1

// Only applies to first y axis
// Only applies to charts on active spreadsheet
// Allows for multiple series
// Takes approx 3 seconds per 10 charts to run
// Change Sheet1 for your sheet name
var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Sheet1')
var config = {
// y-axis max is this factor higher than your chart's max value
// For example if your max value is 100 and scaleUpBuffer is 0.1,
// the y-axis max value will be set to 100 * (1 + 0.1) = 110
scaleUpBuffer: 0.0001,
// y-axis min is this factor lower than your chart's min value
scaleDownBuffer: 0.0001,
// If / when google fix goes through,
// set this to true and run fixCharts() to get default scaling back
// This sets min and max y axis values to null (the default)
restoreDefault: false,
}
function fixCharts() {
var minMaxY1;
sheet.getCharts().forEach(function (chart) {
minMaxY1 = config.restoreDefault ? [null, null] : getChartMinMaxY(chart, config);
updatedChart = chart
.modify()
.setOption('vAxes', {0: {viewWindow: {min: minMaxY1[0], max: minMaxY1[1]}}})
.build();
sheet.updateChart(updatedChart);
})
}
function getChartMinMaxY(chart, config) {
var chartRangeArray,
y1 = [];
chart.getRanges().forEach(function(chartRange) {
chartRangeArray = chartRange.getValues();
chartRangeArray.forEach(function(row) {
for (var i=1;i<row.length;i++) {
// loops all series, assumes all on 1st y axis
if (typeof row[i] == 'number') {
// ignores blanks, headers, junk strings etc.
y1.push(row[i]);
}
}
});
});
return [
Math.min.apply(null, y1) * (1 - config.scaleDownBuffer),
Math.max.apply(null, y1) * (1 + config.scaleUpBuffer)
];
}