Specifying form for 'on form submit' trigger

Question

I have two google forms, which send data to two tabs in a single spreadsheet.

I have set up a script with two functions. I would like the first function to run on s

Answer 1

As I suggested in the comments, you can determine the origin of the form submission by analyzing the response object's content.

Here is a basic example to illustrate : it will send you an email to tell which form has been submitted but you can of course use the same condition test to select the action you want to run.

function formSubmitOriginTest(e){
//  Logger.log(JSON.stringify(e));
// example value : {"namedValues":{"Untitled Question 2":["test"],"Timestamp":["8/17/2014 11:22:47"]},"values":["8/17/2014 11:22:47","test"],"source":{},"range":{"rowStart":3,"rowEnd":3,"columnEnd":2,"columnStart":1},"authMode":{}}
  if(e.namedValues["Untitled Question 2"]!=undefined){// only form B has one question with this exact title, that's enough to identify it.
    MailApp.sendEmail(Session.getActiveUser().getEmail(),'form B has been submitted','');// optionally include the answers in the email body if you want
  }else{
    MailApp.sendEmail(Session.getActiveUser().getEmail(),'form A has been submitted','');// optionally include the answers in the email body if you want
  }
}