Return false to prevent the default behaviour when adding/removing error messages.
Example: $.validate(); /* Supported languages ------------------- Polish: pt Romanian: ro Danish: dk Norwegian: no Dutch: nl Czech: cz Catalan: ca Russian: ru Italian: it French: fr German: de Swedish: se English: en Portuguese: pt */ if you want to validate a form programmatically. The first argument being an object used to override the default error dialogs and the second argument being the configuration object.
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If you don't want this feature you can read the setup guide on how to disable it.
There are two ways you can give suggestions to the user while the user types.
If you want to allow any kind of letters (not only A-Z) you're looking for the letternumeric validator.
Validate qty of checkboxes in a group (same name) have been checked, using min, max or range.
In such a case you must combine the method call with the on Success callback.