Intercept target=_top requests

[saversa]

Hi,
I'm using CEF as an embedded html & js engine in my app;
when a web page has an iframe with an href pointing to target=_top, when clicking to this link the main web page is replaced by the new link.

I want to intercept this request and redirect it to the iframe instead of main frame.
I tried the CefRequestHandler::OnBeforeBrowse / CefLoadHandler::OnLoadStart, but are called when the url is already loading into main frame.

Is it possible to intercept the request to the target=_top before it's loaded to the main frame?

Thanks

[Czarek]

OnBeforeBrowse should be called before loading url, you should test it again. Return an appropriate value to cancel navigation.

[saversa]

Ok,
I tried this code to detect if the request comes from the iframe or the main frame, and redirect the request to the iframe

Code: Select all

bool
WrapperClient::OnBeforeBrowse (CefRefPtr<CefBrowser> browser,
    CefRefPtr<CefFrame> frame, CefRefPtr<CefRequest> request, bool isRedirect)
{
   if ((request->GetResourceType() == RT_MAIN_FRAME) && (!frame->IsMain()))
   {
      // a request comes from iframe and redirected to main frame,
      // cancels it, and load to iframe
      frame->LoadURL(request->GetURL());
      return true;
   }
   return false;
}

when the iframe contains <a href=... target="_self" />, GetResourceType() returns RT_SUB_FRAME and frame->IsMain() returns false => so i think that the request comes from the iframe
instead when the iframe contains <a href=... target="_top"/>, GetResourceType() returns RT_MAIN_FRAME and frame->IsMain() return true, assuming the request comes from the top level frame instead of the iframe; i was expeting that when the target=_top request comes from the iframe, the frame->IsMain() was false...

(I hope you understand the usecase )

Is there any other method to detect if the url loaded by the iframe will be loaded into the toplevel frame?

[Czarek]

Call LoadURL after returning true. Use CefPostDelayedTask or similar.

[saversa]

mmm,
after some testing, I saw that OnBeforeBrowser is called always with a reference on the main frame and not on the iframe that containts the link.

I "resolved" by converting all <a href=... target="_top"> into <a href=... target="_self"> on every iframe, every time a page is loaded.

Thanks