How to catch JavaScript errors in all Iframes (with window.error)?

Question

I know one can add event listener for window.error.

However when working with Iframes, each iframe has its own window element, and window.error

Answer 1

This might work.

function myHandler(msg, url, line){
  //do stuff here...
}

//hook in all frames...
function addErrorHandler(win, handler){
  win.onerror = handler;
  for(var i=0;i