How to tell if a window exists in Javascript?

Question

I\'ve seen ways of seeing if a window a particular script opened is still opened, but what if it didn\'t?

I have a small window that has a button to click to load th

Answer 1

Use try{} and catch(err){}.

try{
window.opener.document.body.getElementById('#elementId'); // do some action with window. opener
}
catch(err){
// if we are here then probably there is no window.opener
window.close(); // closing this window or whatever you want
}