harmony 鸿蒙ArkUI Web Component (ArkTS) Development

2023-02-03
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ArkUI Web Component (ArkTS) Development

What is the domStorageAccess attribute of the <Web> component used for?

Applicable to: OpenHarmony SDK 3.2.6.5, stage model of API version 9

The domStorageAccess attribute specifies whether to enable the DOM Storage API, which is disabled by default and provides localStorage, but not sessionStorage.

How do I check the online status on the HTML page loaded by the <Web> component?

Applicable to: OpenHarmony SDK 3.2.7.5, stage model of API version 9

Configure the ohos.permission.INTERNET and ohos.permission.GET_NETWORK_INFO application permissions.
Obtain the online status through window.navigator.onLine on the HTML page.

What should I do if the UserAgent string cannot be used in concatenation before the initial HTML5 page loading by the <Web> component?

Applicable to: OpenHarmony SDK 3.2.6.5, stage model of API version 9

By default, the UserAgent string is obtained through the WebController. A WebController object can control only one <Web> component, and methods on the WebController can only be called by the <Web> component bound to it. To concatenate the default UserAgent string and a custom string before the initial page loading, perform the following:

Use @State to define the initial userAgent and bind it to the <Web> component.
In the onUrlLoadIntercept callback of the <Web> component, use WebController to obtain the default userAgent string and modify the userAgent bound to the <Web> component. The code snippet is as follows:

   @Entry
   @Component
   struct Index {
     private controller: WebController = new WebController()
     @State userAgentPa: string = ''
     build() {
       Row() {
         Column() {
           Web({ src: 'www.example.com', controller: this.controller })
             .width('100%')
             .userAgent(this.userAgentPa)
             .onUrlLoadIntercept((event) => {
               let userAgent = this.controller.getDefaultUserAgent();
               this.userAgentPa = userAgent + ' 111111111'
               console.log("userAgent onUrlLoadIntercept: " + userAgent);
               return false;
             })
         }
         .width('100%').alignItems(HorizontalAlign.Start).backgroundColor(Color.Green)
       }
       .height('100%')
     }
   }

Should the logic for loading the lottie animation be written in the onAppear or onReady function?

Applicable to: OpenHarmony SDK 3.2.6.5, stage model of API version 9

The logic for loading the lottie animation must be written in the onReady function. The onReady function is triggered when the canvas is ready, while the onAppear function is triggered when the canvas is displayed.

Do I need to invoke the refresh API after invoking deleteJavaScriptRegister?

Applicable to: all versions

No. This operation is not needed.

How do I pass data from a page to the <Web> component?

Applicable to: OpenHarmony SDK 3.2.7.5, stage model of API version 9

Use WebController to create two message ports: message port 1 and message port 0.
Send message port 1 to the HTML side, which can then save and use the port.
Register a callback for message port 0 on the application side.
Use message port 0 on the application side to send messages to message port 1 on the HTML side.

Reference: Web