Handling UI events
For the instances where you need to block the form from getting saved due to a user input error I have mentioned briefly, it's always a good idea to return a message to the user and notify them of the reason for such a decision. The option specified results in returning an alert message to the user.
In other situations, you will find that posting a message on the form itself can be much more efficient. For one, it does not require an additional click of the mouse. Also, you can create a tally of all the messages, and display them all in one single spot, formatted to stand out.
Note
This recipe describes a customization approach that is not officially supported. The reason for this is that referencing the form elements is done outside ...
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