Verify in JavaScript if the script is executing within a WinStore (WinJS) program

I am in the process of developing a JavaScript library that is compatible with both Windows Store (WinJS) applications and traditional HTML/JavaScript apps. The dependency I am utilizing loads dynamically and has separate SDKs for WinJS apps and standard websites, so detecting which environment my code is running in becomes crucial to load the appropriate one.

While I can use code like the snippet below to determine if it's a WinJS app, I'm interested in discovering a more elegant solution to identify the execution environment. Is there a cleaner method to ascertain this?

function isWinJS() {
    return typeof Windows === 'object' &&
        typeof Windows.UI === 'object' &&
        typeof Windows.UI.Popups === 'object' &&
        typeof Windows.UI.Popups.MessageDialog === 'function';
}

Answer №1

WinJS utilizes namespace detection to distinguish between Windows and web environments. I recommend exploring how it tackles this issue in a systematic manner. You can examine the code on https://github.com/winjs/winjs (latest versions), or delve into WinJS 1.0 or 2.0 specifically designed for Windows, where the detection process is more straightforward. In those earlier versions, detection was crucial as WinJS could be loaded onto a Webview or web context within the app when WinRT was not accessible. One specific example of this is the implementation of the WinJS sessionState object.

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