[REF-2636]Improve Error message for unsupported event trigger

reflex/components/component.py

@@ -255,6 +255,7 @@ def __init__(self, *args, **kwargs):
 
         Raises:
             TypeError: If an invalid prop is passed.
+            ValueError: If an event trigger passed is not valid.
         """
         # Set the id and children initially.
         children = kwargs.get("children", [])
@@ -284,6 +285,12 @@ def __init__(self, *args, **kwargs):
 
         # Iterate through the kwargs and set the props.
         for key, value in kwargs.items():
+            if key.startswith("on_") and key not in triggers and key not in props:
+                raise ValueError(
+                    f"The {(comp_name := type(self).__name__)} does not take in an `{key}` event trigger. If {comp_name}"
+                    f" is a third party component make sure to add `{key}` to the component's event triggers. "
+                    f"visit https://reflex.dev/docs/wrapping-react/logic/#event-triggers for more info."
+                )
             if key in triggers:
                 # Event triggers are bound to event chains.
                 field_type = EventChain

tests/components/test_component.py

@@ -1569,3 +1569,28 @@ class TestComponent(Component):
             parse_args_spec(custom_triggers[trigger_name]),
         ):
             assert v1.equals(v2)
+
+
+def test_invalid_event_trigger():
+    class TriggerComponent(Component):
+        on_push: Var[bool]
+
+        def get_event_triggers(self) -> Dict[str, Any]:
+            """Test controlled triggers.
+
+            Returns:
+                Test controlled triggers.
+            """
+            return {
+                **super().get_event_triggers(),
+                "on_a": lambda: [],
+            }
+
+    trigger_comp = TriggerComponent.create
+
+    # test that these do not throw errors.
+    trigger_comp(on_push=True)
+    trigger_comp(on_a=rx.console_log("log"))
+
+    with pytest.raises(ValueError):
+        trigger_comp(on_b=rx.console_log("log"))