Scripting error changing field required state

Question

I need to update all fields in a document to be not required. I read the value but cannot set it. I get the following error in the debugger.
NotAllowedError: Security settings prevent access to this property or method.
Field.required:10:click undefined:Exec
According to the documentation, this should be easy to do.
required
Sets or gets the required characteristic of a field. When true, the fields value must be nonnull when the user clicks a submit button that causes the value of the field to be posted. If the field value is null, the user receives a warning message and the submit does not
occur.
Type: Boolean Access: R/W Fields: all except button.
Example
Make "myField" into a required field.
var f = this.getField("myField");
f.required = true;
I am not sure what this means or how to correct. Any help would be greatly appreciated. My code is below.
var fieldCount = event.target.numFields;
for ( var i = 0; i < fieldCount; i++)
var fieldName = event.target.getNthFieldName(i);
app.alert(fieldName);
var field = event.target.getField(fieldName);
if(field.type != "button" &&
field.type != "checkbox")
app.alert(field.required);
field.required = false;

Answer 1

If you are designing your form in Designer and not Acrobat then you shouldn't be trying to change the property on the AcroForm object (ie: the fields you get from using event.target.getField()) but rather on the XFA object. Here is an example copied from the XML Form Object Model Reference that changes all fields to read only. You can modify this to achieve what you want. In your case you'll want to set the mandatory property to "disabled".
// Get the field containers from each page.
for (var i = 0; i < xfa.host.numPages; i++) {
var oFields = xfa.layout.pageContent(i, "field");
var nodesLength = oFields.length;
// Set the access type.
for (var j = 0; j < nodesLength; j++) {
var oItem = oFields.item(j);
if (oItem != this) {
oItem.access = "readOnly";
Chris
Adobe Enterprise Developer Support