Automatically create new sheet for each user completing a form. Used in http://mashe.hawksey.info/2011/07/apps-script-intro-form-split/

gistfile1.js

/*   
   Copyright 2011 Martin Hawksey

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
var usernameColNumber = 1; // this is the column number of where usernames are stored from form submissions (A=1, B=2 etc)

function onFormSubmit() {
  // onFormSubmit
  // get submitted data
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("Form_Sheet");
  var headings = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues();
  var lastRow = sheet.getRange(sheet.getLastRow(), 1, 1, sheet.getLastColumn()).getValues();
  var studentUsername = lastRow[0][usernameColNumber-1];
  // check if username has sheet
  if(ss.getSheetByName(studentUsername)){
    var userSheet = ss.getSheetByName(studentUsername);
    //    if not make
  } else {
    var userSheet = ss.insertSheet(studentUsername);
    userSheet.getRange(1, 1 , 1, headings[0].length).setValues(headings);
  }
  // copy submitted data to user's sheet 
  userSheet.getRange(userSheet.getLastRow()+1, 1, 1, lastRow[0].length).setValues(lastRow);
}