How can I force my Vue SPA to open externally instead of Telegram’s in-app browser on iOS?

Below are a few suggestions that might help you work around the problem:

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1. Detecting the In‑App Browser

Since the issue only occurs when your site is loaded inside Telegram’s in‑app browser, you can use the user agent or feature detection to determine if your site is running there. For example, in a Vue component you could do:

JSCopied
export default {
  mounted() {
    const ua = navigator.userAgent || '';
    if (ua.includes('Telegram')) {
      this.inAppBrowser = true;
      // Optionally, show a banner advising the user to open the page in Safari/Chrome.
    }
  },
  data() {
    return {
      inAppBrowser: false
    }
  }
}

Then in your template you might conditionally render a banner:

HTMLCopied
<div v-if="inAppBrowser" class="banner">
  For a better experience, please open this page in your default browser.
  <a href="YOUR_PAGE_URL" target="_blank">Open in Safari/Chrome</a>
</div>

Note: Unfortunately, iOS does not allow a page to force open itself in Safari automatically. The user must click a link or button.

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2. Debugging the Login Error

The Telegram Login Widget’s scripts load without the crossorigin="anonymous" attribute, which leads to limited information from JavaScript error logging. You can try to debug this further by:

• Using Remote Debugging:
  On iOS, you can connect your device to a Mac and use Safari’s Web Inspector (via the Develop menu) to see errors that occur in the in‑app browser. This can provide more detail than a generic Script error.

• Monitoring Network Requests:
  Sometimes issues may be due to network problems or the way the widget’s resources are loaded. Checking the network requests in the Web Inspector might reveal more clues.

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3. Providing an External Open Option

Since it’s not possible to force an external browser to open from within the in‑app view (without user interaction), the best approach is to provide a user-friendly prompt. Ensure that your banner or modal clearly instructs the user that clicking the link will open the page in Safari or another external browser. This is similar to using target="_blank", but note that this only works when the user explicitly clicks; there’s no way to automatically change the browsing context for a normal Telegram client.

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4. Considering Alternative Flows

If the Telegram login flow is critical to your site performance, you might consider:

• Custom OAuth/Authentication Solutions:
  If the Telegram Login Widget consistently fails in the in‑app browser, consider using an OAuth flow that you control more directly. This could let you offer a fallback or error message with suggestions on how to continue.

• Communicating with Telegram:
  Review Telegram’s documentation or contact their developer support to see if there are known issues with their in‑app browser and if any workarounds are supported on iOS devices.

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Summary

Since iOS restricts automatically switching to an external browser from within an in‑app view, a good compromise is to detect if the user is in Telegram’s browser, then show a prompt advising them to open the page externally. Use remote debugging tools on iOS (via Safari Web Inspector) to get more insight into the Telegram widget error.

These steps should give you a practical path forward while balancing user experience with the technical limitations inherent in iOS in‑app browsers.

Let me know if you need more detailed code examples or further clarification on any of these steps!