打字稿类型BeforeInstallPromptEvent [英] Typescript type BeforeInstallPromptEvent
问题描述
在使用 beforeinstallprompt
事件时,我应该使用哪种类型?
What's kind of type I should use when using beforeinstallprompt
event?
我尝试了 BeforeInstallPromptEvent
类型,但是给了我一个错误:
I tried BeforeInstallPromptEvent
type, but gave me an error:
export class PwaService {
//promptEvent: BeforeInstallPromptEvent;
promptEvent;
constructor(private swUpdate: SwUpdate, platform: PlatformService) {
if(platform.isBrowser()){
swUpdate.available.subscribe(event => {
/*if (askUserToUpdate()) {
window.location.reload();
}*/
});
window.addEventListener('beforeinstallprompt', event => {
this.promptEvent = event;
});
}
}
install(): void {
if(this.promptEvent){
this.promptEvent.prompt();
}
}
}
推荐答案
BeforeInstallPromptEvent 是非标准的Web API,目前仅受Chrome和Android支持.我什至不确定Google是否认为它稳定,但是无论哪种情况,我都不希望很快在TypeScript DOM库中看到正式的类型定义.
The BeforeInstallPromptEvent is a non-standard Web API and currently only supported by Chrome and Android. I'm not even sure whether Google considers it stable yet, but in either case I wouldn't expect to see an official type definition in the TypeScript DOM library any time soon.
不过,您可以自己定义类型,例如在 .d.ts文件中.我使用下面的定义(来自 MDN 的评论)在Chrome 68中足够准确.
However you can define the type yourself, e.g. in a .d.ts file. I use the definition below (comments from MDN), which seems to be accurate enough in Chrome 68.
/**
* The BeforeInstallPromptEvent is fired at the Window.onbeforeinstallprompt handler
* before a user is prompted to "install" a web site to a home screen on mobile.
*
* @deprecated Only supported on Chrome and Android Webview.
*/
interface BeforeInstallPromptEvent extends Event {
/**
* Returns an array of DOMString items containing the platforms on which the event was dispatched.
* This is provided for user agents that want to present a choice of versions to the user such as,
* for example, "web" or "play" which would allow the user to chose between a web version or
* an Android version.
*/
readonly platforms: Array<string>;
/**
* Returns a Promise that resolves to a DOMString containing either "accepted" or "dismissed".
*/
readonly userChoice: Promise<{
outcome: 'accepted' | 'dismissed',
platform: string
}>;
/**
* Allows a developer to show the install prompt at a time of their own choosing.
* This method returns a Promise.
*/
prompt(): Promise<void>;
}
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