Google apps script to export an individual sheet as csv file

export-named-sheet-as-csv.gs

/*
 * script to export data of the named sheet as an individual csv files
 * sheet downloaded to Google Drive and then downloaded as a CSV file
 * file named according to the name of the sheet
 * original author: Michael Derazon (https://gist.github.com/mderazon/9655893)
*/

function onOpen() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var csvMenuEntries = [{name: "Download Primary Time File", functionName: "saveAsCSV"}];
  ss.addMenu("Creating a Timetable", csvMenuEntries);
};

function saveAsCSV() {
  var ss = SpreadsheetApp.getActiveSpreadsheet(); 
  var sheet = ss.getSheetByName('Primary Time');
  // 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) {
  var app = UiApp.createApplication().setHeight('60').setWidth('150');
  //Change what the popup says here
  app.setTitle("Your timetable CSV is ready!");
  var panel = app.createPopupPanel()
  //Change what the download button says here
  var link = app.createAnchor('Click here to download', downloadURL);
  panel.add(link);
  app.add(panel);
  var doc = SpreadsheetApp.getActive();
  doc.show(app);
}

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 = 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] + "\"";
          }
        }

        // 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);
  }
}

@Matt-McDonald-AS: That's because the CSV formatting code above isn't correct (it only checks for commas) - but there's more things to take into account:

• Quotes themselves must be escaped (double them -> " becomes "")
• Commas must be escaped (put string in quotes)
• New lines must be escaped (put string in quotes)
• Basically, all the values should be quoted, just to be safe.

I've updated the function to the following, and it works great:

function convertRangeToCsvFile_(csvFileName, sheet) {
  try {
    var data = sheet.getDataRange().getDisplayValues();
    if (data.length > 1) {
      var rows = [];
      data.forEach(row => {
        var cols = [];
        row.forEach(col => {
          cols.push(`"${col.replace(/"/g, '""')}"`);
        });

        rows.push(cols.join(','));
      });
      
      return rows.join('\n');
    }
  } catch(err) {
    Logger.log(err);
    Browser.msgBox(err);
  }
}

I'd rather recommend keeping the original code to keep the split functionality, but else a good improvement.

`function convertRangeToCsvFile_(sheet, rowsPerFile) {
// get available data range in the spreadsheet
var activeRange = sheet.getDataRange();
try {
var data = activeRange.getValues();
var csvFiles = [];

// loop through the data in the range and build a string with the csv data
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].replace(/"/g, '""')}"`) ; //  modification of original code
      }
    }

    // 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];
    }

    if ((row + 1) % rowsPerFile === 0) {
      csvFiles.push(csv);
      csv = "";
    }
  }
}
// If there are remainders that doesnt reach the number of files needed.
// It will add another file, containing all remainder rows there.
// 10010 rows / 20 files = 10 rows excess
// 21st file will contain those 10 rows excess
// No excess means no 21st file
if(csv) {
  csvFiles.push(csv);
}
return csvFiles;

}
catch(err) {
Logger.log(err);
}
}
`

This was great, thank you!

@gabrielgz92 I got it to work by replacing the showurl function with this:

function showurl(downloadURL) {
  //Change what the download button says here
  var link = HtmlService.createHtmlOutput('<a href="' + downloadURL + '">Click here to download</a>');
  SpreadsheetApp.getUi().showModalDialog(link, 'Your CSV file is ready!');
}

This helped a TON. Thank you for this update! Worked perfect.

Hello, in my case I got a correct downloadURL but only working if I manually introduce it to the browser. However if url is called within the Apps Script (showModalDialog()) I got initial 303 status redirection followed up 18 302 status redirection since I end up with ERR_TOO_MANY_REDIRECTS. Any clue?

• Folder is created OK
• Csv file is created OK
• URL file is created OK
• By changing folder permissions is not working aswell.

Other approach I did--> If I just copy the GET request from manually get File > Download > CSV in the browser works but within the dialog got this error:

Thanks!