One very handy, yet very mysterious property in the PeopleTools page fields is the so-called Modifiable by JavaScript property. This property is available under the Use tab of user-input page fields. It is used to be labeled Modifiable from HTML on the earlier versions of PeopleTools (8.2x and earlier). This property is mysterious because its use is not documented thoroughly in PeopleBooks. Only a passing remark on the property is made to describe it under the Application Designer PeopleBook:
Modifiable by JavaScript - This is a security-related feature and should always be cleared unless you are familiar with modifying an invisible field using JavaScript in an HTML area. If the Invisible check box is cleared, Modifiable by JavaScript is cleared and unavailable for entry. If the Invisible check box is selected, this check box is cleared, by default.
