Add _input_property to private form models to make them work in controls

vizro-core/src/vizro/models/_components/form/_text_area.py

@@ -4,9 +4,9 @@
 from dash import html
 
 try:
-    from pydantic.v1 import Field
+    from pydantic.v1 import Field, PrivateAttr
 except ImportError:  # pragma: no cov
-    from pydantic import Field
+    from pydantic import Field, PrivateAttr
 
 from vizro.models import Action, VizroBaseModel
 from vizro.models._action._actions_chain import _action_validator_factory
@@ -32,6 +32,9 @@ class TextArea(VizroBaseModel):
     placeholder: str = Field("", description="Default text to display in input field")
     actions: list[Action] = []
 
+    # Component properties for actions and interactions
+    _input_property: str = PrivateAttr("value")
+
     # Re-used validators
     # TODO: Before making public, consider how actions should be triggered and what the default property should be
     # See comment thread: https://github.com/mckinsey/vizro/pull/298#discussion_r1478137654

vizro-core/src/vizro/models/_components/form/_user_input.py

@@ -4,9 +4,9 @@
 from dash import html
 
 try:
-    from pydantic.v1 import Field
+    from pydantic.v1 import Field, PrivateAttr
 except ImportError:  # pragma: no cov
-    from pydantic import Field
+    from pydantic import Field, PrivateAttr
 
 from vizro.models import Action, VizroBaseModel
 from vizro.models._action._actions_chain import _action_validator_factory
@@ -32,6 +32,9 @@ class UserInput(VizroBaseModel):
     placeholder: str = Field("", description="Default text to display in input field")
     actions: list[Action] = []
 
+    # Component properties for actions and interactions
+    _input_property: str = PrivateAttr("value")
+
     # Re-used validators
     # TODO: Before making public, consider how actions should be triggered and what the default property should be
     # See comment thread: https://github.com/mckinsey/vizro/pull/298#discussion_r1478137654