Why doesn't this javascript delete comments on forms in the iOS Adobe Reader App

HI all

I have created a form using Acrobat and it works well on the iPad which is the target device for using the form. As part of using the form I want users to be able to select "add comment" and sign the form using their finger and then submit it.

I then want to be able to use a javascript to "clear" the form and delete all comments

I am using this javascript which works perfectly on the desktop but doesnt work on an iPad. Any ideas why? Thanks in advance

syncAnnotScan();var annots = getAnnots();var i; for (i = (annots.length - 1); i > -1; i -= 1) {annots[i].destroy();}