PWA 添加到主屏幕不显示弹出窗口 [英] PWA add to home screen not showing popup

问题描述

我为我的静态站点实现了 PWA.Service Worker 注册成功，我的页面也按我预期的那样离线工作，但真正的问题是添加到主屏幕

I implemented PWA for my static site. service worker register successfully and my page is also working in offline as I expected but the real problem is in add to Home screen

我将 ma​​nifest.json 包含在适当的图标中，但仍然没有看到添加主屏幕弹出，并且在尝试将添加到主屏幕时，只有我能够看到弹出窗口

I included manifest.json with appropriate icons and still, I don't see the add home screen pop up and while trying to push the add to home screen from inspected only i able to see the popup

这是我的网站 URL:https://www.savesoftinc.com/

This my site URL: https://www.savesoftinc.com/

清单 JSON:

{
 "name": "Save Soft",
 "short_name": "SaveSoft",
  "start_url": ".",
  "display": "standalone",
  "background_color": "#fff",
  "theme_color": "#0EC3F7",
  "description": "IT Services & Solutions.",
 "icons": [
  {
   "src": "\/android-icon-36x36.png",
   "sizes": "36x36",
   "type": "image\/png",
   "density": "0.75"
  },
  {
   "src": "\/android-icon-48x48.png",
   "sizes": "48x48",
   "type": "image\/png",
   "density": "1.0"
  },
  {
   "src": "\/android-icon-72x72.png",
   "sizes": "72x72",
   "type": "image\/png",
   "density": "1.5"
  },
  {
   "src": "\/android-icon-96x96.png",
   "sizes": "96x96",
   "type": "image\/png",
   "density": "2.0"
  },
  {
   "src": "\/android-icon-144x144.png",
   "sizes": "144x144",
   "type": "image\/png",
   "density": "3.0"
  },
  {
   "src": "\/android-icon-192x192.png",
   "sizes": "192x192",
   "type": "image\/png",
   "density": "4.0"
  },
  {
   "src": "\/ms-icon-512x512.png",
   "sizes": "512x512",
   "type": "image\/png",
   "density": "5.0"
  }
 ]
}

并尝试使用下面的代码来弹出横幅正如谷歌所建议的

And also try the below code to pop up the banner as suggested by google

window.addEventListener('beforeinstallprompt', (e) => {
  // Prevent Chrome 67 and earlier from automatically showing the prompt
  e.preventDefault();
  // Stash the event so it can be triggered later.
  deferredPrompt = e;
  // Update UI notify the user they can add to home screen
  btnAdd.style.display = 'block';
});
btnAdd.addEventListener('click', (e) => {
  // hide our user interface that shows our A2HS button
  btnAdd.style.display = 'none';
  // Show the prompt
  deferredPrompt.prompt();
  // Wait for the user to respond to the prompt
  deferredPrompt.userChoice
    .then((choiceResult) => {
      if (choiceResult.outcome === 'accepted') {
        console.log('User accepted the A2HS prompt');
      } else {
        console.log('User dismissed the A2HS prompt');
      }
      deferredPrompt = null;
    });
});
window.addEventListener('appinstalled', (evt) => {
  app.logEvent('a2hs', 'installed');
});

但它显示错误:

未捕获的引用错误:未定义 btnAdd

Uncaught ReferenceError: btnAdd is not defined

ref:https://developers.google.com/web/fundamentals/app-install-banners/

推荐答案

添加到主屏幕 (A2HS) 自动弹出测试的第一步是使用灯塔审核工具.
您需要在那里运行 PWA 审计并纠正警告，直到您看到
---可以提示用户安装Web App"

The first step for Add to Home Screen (A2HS) automatic pop-up testing is using the lighthouse audit tools.
You need to run the PWA audit and correct warnings there until you see
--- "User can be prompted to install the Web App"

灯塔审计工具可作为 Chrome 开发工具中的选项卡或 Chrome 扩展程序使用.
该扩展程序通常具有更新的功能.

The lighthouse audit tools are available as a tab in the Chrome dev tools or as a Chrome extension.
The extension usually has the more current features.

看到该消息后，您可以在 Chrome 桌面和 Android(Chrome 和 Edge)上测试自动弹出消息

Once you see that message you can test the automatic pop-up message on Chrome Desktop and Android (Chrome & Edge)

注意事项

在您第一次看到它后，要再次看到弹出窗口，您可能需要完全清除浏览器缓存并为
Edge - 删除快捷方式
Chrome 桌面 - 在此处卸载应用程序:chrome://apps/
Crome Android - 卸载应用程序中的 WebApk

After you see it the first time, to see the pop-up again you will probably need to totally clear out your browser cache and for
Edge - delete the shortcut
Chrome Desktop - uninstall the app here: chrome://apps/
Crome Android - uninstall the WebApk in your applications

一旦您知道自动 A2HS 弹出窗口的工作原理，您就可以(如果需要)拦截自动弹出窗口以减少对用户的干扰.向他们展示一个按钮，让他们知道他们可以在方便时使用 A2HS.
如此处所述
https://developers.google.com/web/fundamentals/app-install-横幅/

Once you know the automatic A2HS popup works you can then (if desired) intercept the automatic pop-up to make it less annoying to your users. Show them a button to let them know they can A2HS when convenient for them.
As described here
https://developers.google.com/web/fundamentals/app-install-banners/

这是我的 A2HS 测试仪.
您将看到按钮显示而不是自动弹出.

Here is my tester for A2HS.
You will see the button show instead of the automatic pop-up.

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