Code to make a textfield mandatory

Hi Sahana, The feature your requirement mentioned was Field Validator, kindly check our Field Validators guide. And here's a working code snippet in Java SDK:

		
		EslClient client = new EslClient(API_KEY, API_URL);
		String signerEmail = "[email protected]";
		
		DocumentPackage pkg1 = PackageBuilder.newPackageNamed("Sample Contract")
				.withSigner(SignerBuilder.newSignerWithEmail(signerEmail)
						.withFirstName("John")
						.withLastName("Smith")
						)
				.withDocument(DocumentBuilder.newDocumentWithName("Contract")
						.fromFile(FILE_PATH)
						.withSignature(SignatureBuilder.signatureFor(signerEmail)
								.onPage(0)
								.atPosition(100, 100)
								.withField(FieldBuilder.textField()	
										.onPage(0)
										.atPosition(100, 200)
										.withValidation(FieldValidatorBuilder.basic()
												.required()
												.withErrorMessage("This field is mandatory!"))
										)
								)
						)
				.build();
		
		PackageId packageId = client.createAndSendPackage(pkg1);
		
		System.out.println(packageId);

With above code, you can assign a signature to a signer, and bind the text field to this signature, so that the text field is only visible to this specific signer during signing ceremony. Also, we used a field validator with required attribute to make the textfield mandatory. Hope this could help! Duo