Required field loop

Try using the "Validate" event. This is the correct location for validating a field value.

Tried using the same code on the validate event, but I get the error messages for both fields when the PDF is opened and nothing happens when I click on both fields.

The validate event is run when data is entered into the fields. The last value evaluated in the validate event must be a true/false statement, Which tells acrobat whether or not the validation passed.

Not exactly sure I understand. Could you provide an example?
Thanks.

The problem with your code right now is that focus is being constantly moved between the fields because the enter and exit events follow each other. To break this cycle the testing code needs to be moved to a location that only gets called when there is a change in the field value. Since the code is doing a validation, the validate event it perfect.

Just enter this code into the validate event. Set the validate message in the Object tab.

if($.isNull) then
$host.messageBox("Field cannot be blank!")
$host.setFocus($.name);
else
1
endif


Of course, now you have another problem. This code is also called when the form is opened. Another approach is to put it in the change event.