Access provides a number of ways to restrict input: You can use these methods of validating data alone or in combination with each other.
Therefore, like with HTML4, you need to also validate input constraints on the server side, in a way that is consistent with what is done on the client side.
attribute is set, several e-mail addresses can be set, as a comma-separated list, for this input.
If any of these do not satisfy the condition described here, the Type mismatch constraint violation is triggered.
Note that most input types don't have intrinsic constraints, as some are simply barred from constraint validation or have a sanitization algorithm transforming incorrect values to a correct default.
Check out this video for a quick data validation overview.
You can download an example workbook with all of the data validation examples you'll find in this article.
The creation of web forms has always been a complex task.
While marking up the form itself is easy, checking whether each field has a valid and coherent value is even more difficult, and informing the user about the problem may become a headache.
You can follow along, or create your own data validation scenarios.