error Message Key - Name of language property that is used in case the value of the input is invalid.
error Message - An alternative error message that is used if error Message Key is left with an empty value or isn't defined in the language object.
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.
The following form contains some typical validators needed in a registration form.
This j Query plugin has support for a lot more validation functions, you find them all in the menu to the right.
Use the third argument to tell the validation function if error dialogs should be displayed or not.
Here you can see an example code where we collect all the error dialogs during the validation and pass them on to a custom function displaying the error dialogs.
Modifying the server request The parameter containing the input value, sent to the server, will by default have the same name as the input.
You can however set your own parameter name by using the attribute By using the module sanitize you will be able to declare sanitation functions that will be triggered when inputs looses focus.
If you want to allow any kind of letters (not only A-Z) you're looking for the letternumeric validator.