Web Subsystem ChangeLog

Compared with earlier versions, OpenHarmony 4.0.2.1 has the following API changes in its Web subsystem:

cl.web.1 Parameter Type Change of postMessageEvent

The postMessageEvent API supported only the string type. In OpenHarmony 4.0.2.1 and later versions, it also supports the ArrayBuffer type.

Change Impacts

The API change is forward compatible. Applications developed based on earlier versions can still use the API, and the original functions are not affected.

Key API/Component Changes

• Involved APIs

  postMessageEvent(message: string): void

• Before change

  postMessageEvent(message: string): void
  

• After change

  type WebMessage = ArrayBuffer | string
  postMessageEvent(message: WebMessage): void
  

Adaptation Guide

The API change is forward compatible. Applications developed based on earlier versions can still use the API, and the original functions are not affected.

cl.web.2 Parameter Type Change of onMessageEvent

The onMessageEvent API supported only the string type. In OpenHarmony 4.0.2.1 and later versions, it also supports the ArrayBuffer type.

Change Impacts

The API change is forward compatible. Applications developed based on earlier versions can still use the API. With the corresponding logic handling added, the original functions are not affected.

Key API/Component Changes

• Involved APIs

  onMessageEvent(callback: (result: string) => void): void

• Before change

  onMessageEvent(callback: (result: string) => void): void
  

• After change

  type WebMessage = ArrayBuffer | string
  onMessageEvent(callback: (result: WebMessage) => void): void
  

Adaptation Guide

The API change is forward compatible. Applications developed based on earlier versions can still use the API. With the corresponding logic handling added, the original functions are not affected.