Apps Script code to automatically replace template variables in your invoice document.

automatic_invoice.gs

///////////////////////////////////////////////////////////////////////////////////////////////
// BEGIN EDITS ////////////////////////////////////////////////////////////////////////////////

const TEMPLATE_FILE_ID = 'YOUR_TEMPLATE_FILE_ID_HERE';
const DESTINATION_FOLDER_ID = 'YOUR_DESTINATION_FOLDER_ID_HERE';
const CURRENCY_SIGN = '$';

// END EDITS //////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////
// WARNING: EDITING ANYTHING BELOW THIS LINE WILL CHANGE THE BEHAVIOR OF THE SCRIPT. //////////
// DO SO AT YOUR OWN RISK.//// ////////////////////////////////////////////////////////////////
// ----------------------------------------------------------------------------------------- //

// Converts a float to a string value in the desired currency format
function toCurrency(num) {
    var fmt = Number(num).toFixed(2);
    return `${CURRENCY_SIGN}${fmt}`;
}

// Format datetimes to: YYYY-MM-DD
function toDateFmt(dt_string) {
  var millis = Date.parse(dt_string);
  var date = new Date(millis);
  var year = date.getFullYear();
  var month = ("0" + (date.getMonth() + 1)).slice(-2);
  var day = ("0" + date.getDate()).slice(-2);

  // Return the date in YYYY-mm-dd format
  return `${year}-${month}-${day}`;
}


// Parse and extract the data submitted through the form.
function parseFormData(values, header) {
    // Set temporary variables to hold prices and data.
    var subtotal = 0;
    var discount = 0;
    var response_data = {};

    // Iterate through all of our response data and add the keys (headers)
    // and values (data) to the response dictionary object.
    for (var i = 0; i < values.length; i++) {
      // Extract the key and value
      var key = header[i];
      var value = values[i];

      // If we have a price, add it to the running subtotal and format it to the
      // desired currency.
      if (key.toLowerCase().includes("price")) {
        subtotal += value;
        value = toCurrency(value);

      // If there is a discount, track it so we can adjust the total later and
      // format it to the desired currency.
      } else if (key.toLowerCase().includes("discount")) {
        discount += value;
        value = toCurrency(value);
      
      // Format dates
      } else if (key.toLowerCase().includes("date")) {
        value = toDateFmt(value);
      }

      // Add the key/value data pair to the response dictionary.
      response_data[key] = value;
    }

    // Once all data is added, we'll adjust the subtotal and total
    response_data["sub_total"] = toCurrency(subtotal);
    response_data["total"] = toCurrency(subtotal - discount);

    return response_data;
}

// Helper function to inject data into the template
function populateTemplate(document, response_data) {

    // Get the document header and body (which contains the text we'll be replacing).
    var document_header = document.getHeader();
    var document_body = document.getBody();

    // Replace variables in the header
    for (var key in response_data) {
      var match_text = `{{${key}}}`;
      var value = response_data[key];

      // Replace our template with the final values
      document_header.replaceText(match_text, value);
      document_body.replaceText(match_text, value);
    }

}


// Function to populate the template form
function createDocFromForm() {

  // Get active sheet and tab of our response data spreadsheet.
  var sheet = SpreadsheetApp.getActiveSheet();
  var last_row = sheet.getLastRow() - 1;

  // Get the data from the spreadsheet.
  var range = sheet.getDataRange();
 
  // Identify the most recent entry and save the data in a variable.
  var data = range.getValues()[last_row];
  
  // Extract the headers of the response data to automate string replacement in our template.
  var headers = range.getValues()[0];

  // Parse the form data.
  var response_data = parseFormData(data, headers);

  // Retreive the template file and destination folder.
  var template_file = DriveApp.getFileById(TEMPLATE_FILE_ID);
  var target_folder = DriveApp.getFolderById(DESTINATION_FOLDER_ID);

  // Copy the template file so we can populate it with our data.
  // The name of the file will be the company name and the invoice number in the format: DATE_COMPANY_NUMBER
  var filename = `${response_data["Invoice Date"]}_${response_data["Company Name"]}_${response_data["Invoice Number"]}`;
  var document_copy = template_file.makeCopy(filename, target_folder);

  // Open the copy.
  var document = DocumentApp.openById(document_copy.getId());

  // Populate the template with our form responses and save the file.
  populateTemplate(document, response_data);
  document.saveAndClose();
    
}

thanks

Thanks!~~

Hi Team,

I am having an issue running this script, please find attached the error I am facing, requesting you to kindly provide a solution asap.

.

Hi Team,

I am having an issue running this script, please find attached the error I am facing, requesting you to kindly provide a solution asap.

.

Hi AnuragBYJUs, this is happening because the program is trying to call "replaceText" on a null object (which does not have that property). Are you using the document template provided? Lines 79 and 80 retrieve the header and body of the document and then replace the template variables with the proper values. It looks like your header is returning null (which means you likely don't have a document header set up). Make sure you have a header and then rerun.

only 5 (price) row sum . i want 15 row sum is that possible

I just created a template in sheets and tried to launch with same script, but unfortunately unsuccessful. Is there any possibility to create a script for sheets template?

So, I made a few minor revisions that seem to work ok (different names on variables, but got that figured out) - but having an issue with the sub_total function. I made no changes there, but it seems that it isn't adding the values, but instead concatenating the values together....did I miss something?

could you help me with this problem?

Try commenting the document_header.replaceText(match_text, value); and BOOOOOM you will be able to generate the document.
Hope it helps :)

@jimzdat Were you able to figure out the concatenating issue?

@jimzdat Were you able to figure out the concatenating issue?

I did have it working correctly, but honestly don't recall what I had to do.
That was an initial install, and when I did a future install for another application, it was working fine - so not sure if something got changed in the code?