How to Detect Webview Environment on iOS Devices with JavaScript?

Determine Webview Environment on iOS Devices with JavaScript

Identifying whether a webpage is displayed within Safari or an application's Webview on an iPad or iPhone requires JavaScript detection.

Detection Approach

This technique leverages both window.navigator.userAgent and window.navigator.standalone properties. By examining these, it allows for the differentiation between the following iOS web app states:

• Safari (browser)
• Standalone (fullscreen)
• UIWebView
• Non-iOS

Implementation

The provided code snippet serves as a demo to detect the webpage's environment:

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 ) {
        //browser
    } else if ( standalone && !safari ) {
        //standalone
    } else if ( !standalone && !safari ) {
        //uiwebview
    };
} else {
    //not iOS
};

By comprehending the environment, web app developers can tailor the webpage's behavior and optimize the user experience based on the app's context.

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