function onOpen() is not running

Question

My function includes adding a menu and toast to the document. I have verified that the trigger (onOpen) is set as well. It only works when a user goes into Tools, Script Man

Answer 1

In my case, onOpen wasn't working because I had a variable, outside of a function, opening a sheet with SpreadsheetApp.openById() rather than SpreadsheetApp.getActiveSpreadsheet(). I guess onOpen doesn't work with openById() even if the sheet you are opening is bound to the script. onOpen() won't work with this kind of a variable outside of a function:

var sheet = SpreadsheetApp.openById("1b_PQD...").getSheetByName("demos")

If your script is bound to the sheet, you can solve this problem by using the getActiveSpreadsheet() function. Otherwise, you can solve it by putting your openById() call into a function.

Answer 2

I was having the same issue.

I realized, sometimes Google create some kind of cache of the scripts (I'm used to have a "test" script and I usually alter it's content, and, sometimes, the script runs as if I didn't).

So, what I did that solved the onOpen() not working was changing the function name and ading a trigger manually.

Go to "Resources -> Current script's triggers…"

Choose the function to run on open

It worked like a charm here!

Updated Location Information: or

Then

Answer 3

This is an old post but I just had this problem and find out why it was not working correctly in my case: I had, at the top of my script file a variable that required some authorisations and that prevented the script to correctly run. I saw that OP called var username = Session.getActiveUser().getUsername(); (that requires authorisations, and it's may be the cause).

eg: this code won't work:

function onOpen(){
  SpreadsheetApp.getUi()
  .createMenu("Exportation")
  .addItem("Lancer l'exportation", "exportationMenu")
  .addToUi();
}
var stConsCons= SpreadsheetApp.openById(sgcid).getSheetByName("Consultant");

but this one will work:

function onOpen(){
  SpreadsheetApp.getUi()
  .createMenu("Exportation")
  .addItem("Lancer l'exportation", "exportationMenu")
  .addToUi();
}

function whatever(){
  var stConsCons= SpreadsheetApp.openById(sgcid).getSheetByName("Consultant");
...}

Answer 4

In my case there was a reference error, that while did not stop the script entirely, it did stop the menu from appearing.

I was only able to detect that error after I run a debug on the script.

Answer 5

It looks like the problem may be that "sheet" isn't defined, which is why the toast is failing.