sendmail.js

// Sends mail to registree based on its row data. 
// Arguments
//   - dataSheet: the sheet with registree data
//   - dataRange: the range for the row od data to send
//   - templateRange: the range (cell) for the e-mail body template
//   - subjectRange: the range (cell) for the e-mail subject template
//   - appendEvenInfo: (optional) if event name and date should be appended to the e-mail subject and body
//   - cofigSheet: the sheet with configuration data. Used for retreiving event info if appendEventInfo is true
function sendEmailWithRowData(dataSheet, dataRange, templateRange, subjectRange, appendEventInfo, configSheet) {
  Logger.log("Sending mail...");
  var emailTemplate = templateRange.getValue();
  var emailSubject = subjectRange.getValue();
  if(appendEventInfo){
    
    emailSubject += " - " + configSheet.getRange("B2").getValue();
    
    var dateFormat = "HH:mm Z yyyy-MM-dd";

    emailTemplate += "\n\nEvents starts: " 
      + Utilities.formatDate(new Date(configSheet.getRange("B3").getValue()), "CET", dateFormat)
      +"\nEvent ends: " 
      + Utilities.formatDate(new Date(configSheet.getRange("B4").getValue()), "CET", dateFormat);
  }
  Logger.log("Subject: " + emailSubject);

  //Mail code modified from http://code.google.com/googleapps/appsscript/articles/mail_merge.html
  //Use the first row for rowData, it should be only one row in range
  //The header column = 1 in a Spreadsheet behind a Form
  var objects = getRowsData(dataSheet, dataRange, 1);
  var rowData = objects[0];

  // Generate a personalized email.
  // Given a template string, replace markers (for instance ${"First Name"}) with
  // the corresponding value in a row object (for instance rowData.firstName).
  var emailText = fillInTemplateFromObject(emailTemplate, rowData);
  Logger.log("Body: " + emailText);

  MailApp.sendEmail(rowData.email, emailSubject, emailText); 
}

// Replaces markers in a template string with values define in a JavaScript data object.
// Arguments:
//   - template: string containing markers, for instance ${"Column name"}
//   - data: JavaScript object with values to that will replace markers. For instance
//           data.columnName will replace marker ${"Column name"}
// Returns a string without markers. If no data is found to replace a marker, it is
// simply removed.
function fillInTemplateFromObject(template, data) {
  var email = template;
  // Search for all the variables to be replaced, for instance ${"Column name"}
  var templateVars = template.match(/\$\{\"[^\"]+\"\}/g);

  // Replace variables from the template with the actual values from the data object.
  // If no value is available, replace with the empty string.
  for (var i = 0; i < templateVars.length; ++i) {
    // normalizeHeader ignores ${"} so we can call it directly here.
    var variableData = data[normalizeHeader(templateVars[i])];
    email = email.replace(templateVars[i], variableData || "");
  }

  return email;
}





//////////////////////////////////////////////////////////////////////////////////////////
//
// The code below is reused from the 'Reading Spreadsheet data using JavaScript Objects'
// tutorial.
//
//////////////////////////////////////////////////////////////////////////////////////////

// getRowsData iterates row by row in the input range and returns an array of objects.
// Each object contains all the data for a given row, indexed by its normalized column name.
// Arguments:
//   - sheet: the sheet object that contains the data to be processed
//   - range: the exact range of cells where the data is stored
//   - columnHeadersRowIndex: specifies the row number where the column names are stored.
//       This argument is optional and it defaults to the row immediately above range; 
// Returns an Array of objects.
function getRowsData(sheet, range, columnHeadersRowIndex) {
  columnHeadersRowIndex = columnHeadersRowIndex || range.getRowIndex() - 1;
  var numColumns = range.getEndColumn() - range.getColumn() + 1;
  Logger.log("columnHeadersRowIndex, range.getColumn(), 1 numColumns, " + columnHeadersRowIndex +", "+range.getColumn()+", "+ 1+ ", " +numColumns);
  var headersRange = sheet.getRange(columnHeadersRowIndex, range.getColumn(), 1, numColumns);
  var headers = headersRange.getValues()[0];
  return getObjects(range.getValues(), normalizeHeaders(headers));
}

// For every row of data in data, generates an object that contains the data. Names of
// object fields are defined in keys.
// Arguments:
//   - data: JavaScript 2d array
//   - keys: Array of Strings that define the property names for the objects to create
function getObjects(data, keys) {
  var objects = [];
  for (var i = 0; i < data.length; ++i) {
    var object = {};
    var hasData = false;
    for (var j = 0; j < data[i].length; ++j) {
      var cellData = data[i][j];
      if (isCellEmpty(cellData)) {
        continue;
      }
      object[keys[j]] = cellData;
      hasData = true;
    }
    if (hasData) {
      objects.push(object);
    }
  }
  return objects;
}

// Returns an Array of normalized Strings.
// Arguments:
//   - headers: Array of Strings to normalize
function normalizeHeaders(headers) {
  var keys = [];
  for (var i = 0; i < headers.length; ++i) {
    var key = normalizeHeader(headers[i]);
    if (key.length > 0) {
      keys.push(key);
    }
  }
  return keys;
}

// Normalizes a string, by removing all alphanumeric characters and using mixed case
// to separate words. The output will always start with a lower case letter.
// This function is designed to produce JavaScript object property names.
// Arguments:
//   - header: string to normalize
// Examples:
//   "First Name" -> "firstName"
//   "Market Cap (millions) -> "marketCapMillions
//   "1 number at the beginning is ignored" -> "numberAtTheBeginningIsIgnored"
function normalizeHeader(header) {
  var key = "";
  var upperCase = false;
  for (var i = 0; i < header.length; ++i) {
    var letter = header[i];
    if (letter == " " && key.length > 0) {
      upperCase = true;
      continue;
    }
    if (!isAlnum(letter)) {
      continue;
    }
    if (key.length == 0 && isDigit(letter)) {
      continue; // first character must be a letter
    }
    if (upperCase) {
      upperCase = false;
      key += letter.toUpperCase();
    } else {
      key += letter.toLowerCase();
    }
  }
  return key;
}

// Returns true if the cell where cellData was read from is empty.
// Arguments:
//   - cellData: string
function isCellEmpty(cellData) {
  return typeof(cellData) == "string" && cellData == "";
}

// Returns true if the character char is alphabetical, false otherwise.
function isAlnum(char) {
  return char >= 'A' && char <= 'Z' ||
    char >= 'a' && char <= 'z' ||
    isDigit(char);
}

// Returns true if the character char is a digit, false otherwise.
function isDigit(char) {
  return char >= '0' && char <= '9';
}