How to disable the validation message "<fieldname> cannot be blank"? But when Submit button is clicked, it should still display the standard validation message "At least one required field was empty". Many thanks in advance.
The Empty Message is blank. Also the message is displayed for fields that are set as mandatory dynamically. There is no Empty Message box for those fields
The Form Validation option in Form Properties does the trick but the submit button does not show the message "At least one required field was empty" instead shows the message "Submit cancelled". Moreover the option can be used only for version 9.1 and higher.
Better validation handling was introduced in XFA Spec 3.1 (I think); however it used two new events: validationState and cancelAction. These are only supported in Acrobat/Reader 9.1 and above.
If you do a search on this forum for validationState you will find a few threads. In addition I have a few examples on our site.