1e41f4b71Sopenharmony_ci# Widget Event Capability Overview
2e41f4b71Sopenharmony_ci
3e41f4b71Sopenharmony_ciFor dynamic ArkTS widgets, the [postCardAction](../reference/apis-arkui/js-apis-postCardAction.md#postcardaction) API is provided for interaction between the widget internal and the provider application. Currently, this API supports the router, message, and call events and can be called only in the widget.
4e41f4b71Sopenharmony_ci
5e41f4b71Sopenharmony_ciFor static ArkTS widgets, the [FormLink](../reference/apis-arkui/arkui-ts/ts-container-formlink.md) component is provided for interaction between the widget internal and the provider application.
6e41f4b71Sopenharmony_ci
7e41f4b71Sopenharmony_ci## Dynamic Widget Event Capability
8e41f4b71Sopenharmony_ci![WidgetPostCardAction](figures/WidgetPostCardAction.png)
9e41f4b71Sopenharmony_ci
10e41f4b71Sopenharmony_ciDynamic widget events are used in the following scenarios:
11e41f4b71Sopenharmony_ci- Router event: used to redirect to a UIAbility and update the widget content.
12e41f4b71Sopenharmony_ci- Call event: used to start a UIAbility in the background and update the widget content.
13e41f4b71Sopenharmony_ci- Message event: used to start a FormExtensionAbility, which then updates the widget content.
14e41f4b71Sopenharmony_ci
15e41f4b71Sopenharmony_ci## Static Widget Event Capability
16e41f4b71Sopenharmony_ciSee [FormLink](../reference/apis-arkui/arkui-ts/ts-container-formlink.md).
17