Setting limits for Google Form

GoogleFormLimit

/* Time zone used from your Google Callendar */
FORM_OPEN_DATE   =  "2014-12-20 08:00";
FORM_CLOSE_DATE  =  "2014-12-25 23:30";
RESPONSE_COUNT   =  "100";
 
/* Init the from and set triggers */
function Initialize() {
  
  deleteTriggers_();
  
  if ((FORM_CLOSE_DATE !== "") && 
      ((new Date()).getTime() >= parseDate_(FORM_CLOSE_DATE).getTime())) {
    closeForm();
  }
  
  if ((FORM_OPEN_DATE !== "") && 
      ((new Date()).getTime() < parseDate_(FORM_OPEN_DATE).getTime())) { 
    closeForm();
    ScriptApp.newTrigger("openForm")
    .timeBased()
    .at(parseDate_(FORM_OPEN_DATE))
    .create();
  }
  
  if (FORM_CLOSE_DATE !== "") { 
    ScriptApp.newTrigger("closeForm")
    .timeBased()
    .at(parseDate_(FORM_CLOSE_DATE))
    .create(); 
  }
  
  if (RESPONSE_COUNT !== "") { 
    ScriptApp.newTrigger("checkLimit")
    .forForm(FormApp.getActiveForm())
    .onFormSubmit()
    .create();
  }
  
}
 
/* Remove all existing triggers */
function deleteTriggers_() {  
  var triggers = ScriptApp.getProjectTriggers();  
  for (var i in triggers) {
    ScriptApp.deleteTrigger(triggers[i]);
  }
}
 
/* Send email notification when from status changed */
function informUser_(subject) {
  var formURL = FormApp.getActiveForm().getPublishedUrl();
  MailApp.sendEmail(Session.getActiveUser().getEmail(), subject, formURL);  
}
 
/* Set form to accept responses */
function openForm() {
  var form = FormApp.getActiveForm();
  form.setAcceptingResponses(true);
  informUser_("You Google form is active.");
}
 
/* Closing the form */
function closeForm() {  
  var form = FormApp.getActiveForm();
  form.setAcceptingResponses(false);
  deleteTriggers_();
  informUser_("You Google Form is closed.");
}
 
/* If total form responses >= then set limit, then we close the form */
function checkLimit() {
  if (FormApp.getActiveForm().getResponses().length >= RESPONSE_COUNT ) {
    closeForm();
  }  
}
 
/* Parse the Date for creating Time-Based Triggers */
function parseDate_(d) {
  return new Date(d.substr(0,4), d.substr(5,2)-1, 
                  d.substr(8,2), d.substr(11,2), d.substr(14,2));
}

/* Written by Amit Agarwal [email protected] */