Export a single Google Sheet to CSV File - google-apps-script

Question

I have a sheet named "IMS Import" and I am trying to export the range A3:E to a CSV file by a Google Apps script which will be triggered by a button. The length of the range to be exported changes from week to week so I only want to capture the last populated row. I have the following script but I get a Google error "403. That’s an error. We're sorry, but you do not have access to this page. That’s all we know.":
function onOpen() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var csvMenuEntries = [{name: "Download IMS Import File", functionName: "saveAsCSV"}];
ss.addMenu("Creating a Timetable", csvMenuEntries);
};
function saveAsCSV() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName('IMS Import');
// create a folder from the name of the spreadsheet
var folder = DriveApp.createFolder(ss.getName().toLowerCase().replace(/ /g,'_') + '_csv_' + new Date().getTime());
// append ".csv" extension to the sheet name
fileName = sheet.getName() + ".csv";
// convert all available sheet data to csv format
var csvFile = convertRangeToCsvFile_(fileName, sheet);
// create a file in the Docs List with the given name and the csv data
var file = folder.createFile(fileName, csvFile);
//File downlaod
var downloadURL = file.getDownloadUrl().slice(0, -8);
showurl(downloadURL);
}
function showurl(downloadURL) {
//Change what the download button says here
var link = HtmlService.createHtmlOutput('Click here to download');
SpreadsheetApp.getUi().showModalDialog(link, 'Your CSV file is ready!');
}
function convertRangeToCsvFile_(csvFileName, sheet) {
// get available data range in the spreadsheet
var activeRange = sheet.getDataRange();
try {
var data = activeRange.getValues();
var csvFile = undefined;
// loop through the data in the range and build a string with the csv data
if (data.length > 1) {
var csv = "";
for (var row = 2; 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] + "\"";
}
}
// join each row's columns
// add a carriage return to end of each row, except for the last one
if (row < data.length-1) {
csv += data[row].join(",") + "\r\n";
}
else {
csv += data[row];
}
}
csvFile = csv;
}
return csvFile;
}
catch(err) {
Logger.log(err);
Browser.msgBox(err);
}
}
I get the error at this point in the script:
SpreadsheetApp.getUi().showModalDialog(link, 'Your CSV file is ready!');
I am hoping someone can help me to get a functioning script so that it creates a CSV from A3 to the last populated row.

Answer 1

If you only want the last row of the range change this
var activeRange = sheet.getDataRange();
to this:
var activeRange = sheet.getRange(sheet.getLastRow(),1,1,sheet.getLastColumn());
As far as page access goes I can't be sure. Perhaps you're logged into to two different accounts.