Hi Matthias,
If I'm not misunderstanding, you need to get a value from a WebView and display it in the TextBox.
We can use the window.external.notify(string) function to throw out the value from WebView page, this is written in JS code, so we need to inject javascript into this WebView page, in the app, we just need to handle ScriptNotify event to
receive information.
The above process includes two points:
1. How to inject javascript into a WebView page
2. How to receive information from the WebView
You can find the detailed tutorials about them(5th and 6th item) in this article:
http://blogs.msdn.com/b/wsdevsol/archive/2012/10/18/nine-things-you-need-to-know-about-webview.aspx#AN5
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