In a Google Form we have a pull down selection list.
The list of items may change from minute to minute. The master copy of the data is in a column in a google docs spreadsheet.
When a user accesses the form, we want them to see the latest copy of the pull down list as is current in the spreadsheet.
I don't see an obvious way to do this with triggers. onOpen, for example, only triggers for administrators of the form, not users. Is there a way I can keep this form up-to-date automatically?
This is my first time in google docs, but I'm very experienced in excel scripting.
The work flow needs to be a bit different than what you've described. Since there is no ability for Google Apps Script to interact with an end user accessing a Form, there's no way to react to that. However, you can react to changes in the spreadsheet, and update the form options in preparation for the next end user.
Depending on how the options get updated in the spreadsheet, you can use an installable trigger there, to react to an edit or a change.
If the form is associated with the spreadsheet containing the choices, you can get a handle on the form using Spreadsheet.getFormUrl(), then pass the URL to FormApp.openByUrl(). Otherwise you will need to provide the ID or URL explicitly to FormApp.openById() or .openByUrl(), respectively.
That spreadsheet trigger function can modify the available selections for the relevant question by using ListItem.setChoices() or ListItem.setChoiceValues().
