How does vue3 get the vue instance in non-vue file？

[alamhubb]

I want to develop a tool class. The tool class provides a method to return the current vue instance. How to achieve it?
Neither useRouter nor getCurrentInstance will work in non-Vue files

I figured it out, because there will be many vue instances in the current route, and I don’t know which one to return, so the returned value is null

But what I really want to ask is how to get the vue instance of the current routing interface

[modelair]

getCurrentInstance works in non-vue files.

[alamhubb]

Hello, my business logic is like this. When I receive a message in websocket, I judge whether the current page is a message page. If it is a message page, I need to scroll to the bottom. Otherwise, it is another set of logic. When I judge the current page page, I need to get the route instance of the current page

My websocket is global, and this set of logic is also global, all written in a .ts file

[modelair]

can u provide some minimal reproduction of your page? it's difficult without code.

without code i can say simply: pass your instance to your util on every page check

[alamhubb]

export default class WebsocketUtil {
    static failedReconnectTime = 2000
    static timer: number = null
    static locking: boolean = false
    static ws: WebSocket = null

    static websocketConnect(reload: boolean) {
        this.locking = true;
        this.ws?.close(null);
        this.ws = undefined;
        const websocketUrl = SocialuniAPIConfig.socialuniWebsocketUrl + '/webSocket/message'

        this.ws = new WebSocket(websocketUrl)

        this.ws.onmessage = ((res: MessageEvent) => {
            const notify: NotifyVO = JsonUtil.toParse(res.data)
            if (useRoute().path === ImPagePath.message && this.chatId === notify.chat.id) {
                this.readChatAction(notify.chat.messages)
                this.pushMsgReplaceChat(this.chatIndex, notify.chat)
                this.scrollToMessagePageBottom()
            } else {
                this.pushMsgReplaceChatByChat(notify.chat)
            }
        })
    }
}

The logic goes something like this, useRoute() get undefined

[modelair]

provide your instance(s) to WebsocketUtil constructor. in the instance object router will be available as instance.appContext.config.globalProperties.$router. or simply provide exact router to the constructor.

[alamhubb]

Thank you for your patient answer