Google Spread SheetでCSVをダウンロードするためのGoogle Apps Script

downloadDoubleQuateCsvFile.js

function downloadDoubleQuateCsvFile() {
    var ss = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
    var maxColumn = ss.getLastColumn();
    var maxRow = ss.getLastRow();
    var data = ss.getRange(1, 1, maxRow, maxColumn).getValues();
    if (data.length > 1) {
        var csv = "";
        for (var row = 0; row < data.length; row++)  {
            for (var col = 0; col < data[row].length; col++) {
                if (data[row][col].toString().indexOf(",") != - 1) {
                    data[row][col] = "\"" + data[row][col] + "\"";
                }
            }
          
            if (row < data.length - 1) {
                csv += data[row].join(",") + "\r\n";
            } else {
                csv += data[row];
            }
        }

        csvFile = csv;
    }

    makeCSV(csvFile);
}

function makeCSV(csvString) {
    var csvFileName = 'test.csv';
    var output = ContentService.createTextOutput();
    output.setMimeType(ContentService.MimeType.CSV);
    output.setContent(csvString);
    output.downloadAsFile(csvFileName);
    return output;
}