Dojo – Validation – Links

http://dojotoolkit.org/documentation/tutorials/1.9/validation/

Similar to dojox/validate, custom helper module can be written to group all custom utility functions in one place and can be used across the widgets.

http://dojotoolkit.org/documentation/tutorials/1.6/validation/demo/dijitcheck.html

https://dojotoolkit.org/reference-guide/1.9/dijit/form/ValidationTextBox-tricks.html#id1

IsValid on custom widget can be overridden to do custom validation in case of custom widgets.