Google Spreadsheet Form Backend

code.js

function registerSheetWithScript() {
  ...
  SpreadsheetApp.getUi().alert('This sheet will now receive data from forms!');
}

function onOpen() {
  SpreadsheetApp.getUi().createMenu('FormBackend')
                        .addItem('Register sheet', 'registerSheetWithScript')
                        .addToUi();
}