typeof returning “unknown” in IE

Question

I have a window, where before being closed I refresh the underlying page.

if(opener && typeof(opener.Refresh) != \'undefined\')
{
    opener.Refresh(         


        

Answer 1

Try in operator. I had the same problem (with applet) and I solved it using in:

if("Refresh" in opener) {
    opener.Refresh();
}