12c Webcenter Capture Metadata fields

Hi,

In 12c web center capture, we've a requirement as, If a metadata field has value then

all other remaining fields should not be editable.

for example, I'm having Empid field, if this contains a value then all other fields values should not be editable.

In the Client Script , i made like this

function DocumentSelected(event) {

var currentDocument = documents;

    var captureFields = [];

var batch= documents.getParentBatch();

print("BatchName------>"+batch);

    // Create an array of the document's fields

    var fieldDefs = batch.getWorkspace().getFieldDefinitions();

     var employeeid=fieldDefs.findByName("Empid").getId();

    print ("Empid" +Empid);

        EMPLID1=Empid.value;

    for (var fieldIdx = 0; fieldIdx < fieldsToCopy.length; fieldIdx++) {

      var fieldID = fieldDefs.findByName(fieldsToCopy[fieldIdx]).getId();