Google Sheets Registration

apps_script.gs

// original from: http://mashe.hawksey.info/2014/07/google-sheets-as-a-database-insert-with-apps-script-using-postget-methods-with-ajax-example/
// original gist: https://gist.github.com/willpatera/ee41ae374d3c9839c2d6 

function doPost(e){
  return handleResponse(e);
}

function doGet(e){
  return handleResponse(e);
}

//  Enter sheet name where data is to be written below
var SHEET_NAME = "Sheet1";

var SCRIPT_PROP = PropertiesService.getScriptProperties(); // new property service

function handleResponse(e) {
  // shortly after my original solution Google announced the LockService[1]
  // this prevents concurrent access overwritting data
  // [1] http://googleappsdeveloper.blogspot.co.uk/2011/10/concurrency-and-google-apps-script.html
  // we want a public lock, one that locks for all invocations
  var lock = LockService.getPublicLock();
  lock.waitLock(3000);  // wait 3 seconds before conceding defeat.
  
  try {
    // next set where we write the data - you could write to multiple/alternate destinations
    var doc = SpreadsheetApp.openById(SCRIPT_PROP.getProperty("key"));
    var sheet = doc.getSheetByName(SHEET_NAME);
    
    // Check if email is unique
    var emailExists = sheet.getRange('D1:D')
        .getValues()
        .map(function(row) { return row[0]; })
        .indexOf(e.parameter.Email) > -1;
    if (emailExists) {
       return ContentService
       .createTextOutput(JSON.stringify({"result":"error", "error": "email_already_exists"}))
       .setMimeType(ContentService.MimeType.JSON);
    }
    
    // Check if phone is unique
    var phoneExists = sheet.getRange('E1:E')
        .getValues()
        .map(function(row) { return row[0].toString(); /* Make sure it is String */ })
        .indexOf(e.parameter.Phone) > -1;
    if (phoneExists) {
       return ContentService
       .createTextOutput(JSON.stringify({"result":"error", "error": "phone_already_exists"}))
       .setMimeType(ContentService.MimeType.JSON);
    }
    
    // we'll assume header is in row 1 but you can override with header_row in GET/POST data
    var headRow = e.parameter.header_row || 1;
    var headers = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues()[0];
    var nextRow = sheet.getLastRow()+1; // get next row
    var row = []; 
    
    // loop through the header columns
    for (i in headers){
      if (headers[i] == "Time"){ // special case if you include a 'time' column
        row.push(new Date());
      } else { // else use header name to get data
        row.push(e.parameter[headers[i]]);
      }
    }
    // more efficient to set values as [][] array than individually
    sheet.getRange(nextRow, 1, 1, row.length).setValues([row]);
    
    MailApp.sendEmail("flaminius2k19@gmail.com", "New Registration", registrationInformBody(e.parameters));

    var aliases = GmailApp.getAliases();
    GmailApp.sendEmail(e.parameter.Email, 'Thanks for registering', registrationReplyBody(e.parameters), {from: aliases[0], name:'Flaminius 2k19'});

    // return json success results
    return ContentService
    .createTextOutput(JSON.stringify({"result":"success", "row": nextRow}))
          .setMimeType(ContentService.MimeType.JSON);
  } catch(e){
    // if error return this
    return ContentService
          .createTextOutput(JSON.stringify({"result":"error", "error": e}))
          .setMimeType(ContentService.MimeType.JSON);
  } finally {
    //release lock
    lock.releaseLock();
  }
}

function registrationReplyBody(data) {
  return "Hi " + data.Name +",\n\
\n\
Thanks for registering Flaminius 2k19 symposium. Hope you enjoy our symposium and we are looking forward to welcome you.\n\
\n\
Registration fee of amount Rs 250/- should be paid on symposium day.\n\
Please bring your College ID card.\n\
For more information visit: https://flaminius2k19.web.app\n\
or download our app: https://play.google.com/store/apps/details?id=app.flaminius.flaminius2k19\n\
\n\
For any queries reply to this email";
}

function registrationInformBody(data) {
  return "\nName: " + data.Name +"\n\
    Email: " + data.Email +"\n\
    Phone: " + data.Phone +"\n\
    College: " + data.College +"\n\
    Department: " + data.Department +"\n\
    Food Preference: " + data["Food Preference"] +"\n\
    Time: " + new Date();
}

function setup() {
    var doc = SpreadsheetApp.getActiveSpreadsheet();
    SCRIPT_PROP.setProperty("key", doc.getId());
}