How does one determine if ObjectForScripting has been set for a WPF WebBrowser control from javascript?

Question

Is there a way to determine if the ObjectForScripting property of the WPF WebBrowser control has been set via javascript running in said control? Or, is there a way to determine if the ObjectForScripting has a given method or property defined via javascript?

Answer 1

If ObjectForScripting is not set, window.external will be null .

if(window.external === null)
    alert('ObjectForScripting is not set');
else
    alert('ObjectForScripting is set');

To check if ObjectForScripting has a specific method/property, just check if it's undefined or not.

if(window.external !== null && typeof window.external.MethodName !== 'undefined')
{
    // Method exists
    window.external.MethodName();
}