You’ve created this great form with tons of validations in the various fields to ensure the data that is typed into the field has the correct formatting. Unfortunately, the default behaviour in Acrobat/Reader is to display each validation error separately, one after the other.
You think this is not the best user experience so would like to change it so that all validation errors show up in a single message box. Prior to Designer ES2 this was possible, but involved a considerable amount of script to get the desired behaviour. But now all you have to do in Designer is select File > Form Properties > Form Validation and you’ll see this:
Here you have several options for how you’d like these messages to show up. You can even set colors for the fields that fail validation. If you select the option to combine all messages into one message box, as shown above, it will look like this:
Nice eh? And no need for any scripting. Note there is a limit to the number of messages that will show in a single box.