How Can JavaScript Detect if a Website is Running in an iOS WebView?

How to Detect iOS WebView with JavaScript

In web development, determining if a website runs within the browser or a WebView on an iOS device can be crucial. JavaScript offers a straightforward solution to address this requirement.

One effective approach is to utilize a combination of window.navigator.userAgent and window.navigator.standalone. This method can differentiate between four distinct states of an iOS web app:

• Running in Safari (browser)
• Running as a standalone app (fullscreen)
• Running within an application WebView
• Not running on an iOS device

Here's a concise JavaScript snippet that demonstrates this approach:

<code class="js">var standalone = window.navigator.standalone,
    userAgent = window.navigator.userAgent.toLowerCase(),
    safari = /safari/.test(userAgent),
    ios = /iphone|ipod|ipad/.test(userAgent);

if (ios) {
  if (!standalone && safari) {
    // Running in Safari (browser)
  } else if (standalone && !safari) {
    // Running as a standalone app (fullscreen)
  } else if (!standalone && !safari) {
    // Running within an application WebView
  };
} else {
  // Not running on an iOS device
};</code>

In summary, by leveraging the JavaScript techniques outlined above, developers can determine whether a website is accessed via the iOS Safari browser or an application WebView. This knowledge can aid in tailoring the user experience accordingly.

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