[NXP-14233] Add a validator widget type - Nuxeo Issue Tracker

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There is currently no model to define a JSF validator with properties on the layout system.

It could be interesting to add a widget types just for this use case because:

it can be easy to understand that adding specific validation can be done by dropping a widget in the layout (from Studio)
validator properties can be merged with the widget properties (hence no need to modify or improve the layout model for this)
widget type can handle retrieval of the component(s) to validate, hiding the current complexity of widget templates currently performing that kind of validation

Use cases:

perform cross validation on a layout
add validation to a widget that cannot accept a validator as property (like select2 widgets and other widget templates: the validation method cannot be passed as a property as it needs to be a method expression and not a value expression)

depends on

NXP-13105 Improve lookup of components in the JSF tree

NXP-13686 Improve JSF validation helpers

duplicates

NXP-4931 Add features for cross validation and ajax re-rendering of groups of widgets

NXP-4934 Add a generic way to declare validators on builtin widget types

is required by

NXP-15012 Use html5 validators on forms fields