Runtime Considerations for Flow Screen Components
When you’re configuring components for flows, review these considerations for defining attributes and flow runtime behavior.
nulldefault input values.
If a flow admin doesn't set a default input value for a custom screen component, Flow Builder passes a
nullvalue at component run time. To set a default value at run time, add a
Notify runtime of attribute changes.
Lightning web components use events to report changes from components to flows. To notify the flow runtime of attribute changes, a component fires the
FlowAttributeChangeEventevent. For example, use this event when using conditional visibility to render a screen component when conditions are met or when mapping the value of output attributes to flow variables. For code samples, see