HTML - How do I know when all frames are loaded?

I'm using .NET WebBrowser control. How do I know when a web page is fully loaded?

I want to know when the browser is not fetching any more data. (The moment when IE writes 'Done' in its status bar...).

Notes:

The DocumentComplete/NavigateComplete events might occur multiple times for a web site containing multiple frames.
The browser ready state doesn't solve the problem either.
I have tried checking the number of frames in the frame collection and then count the number of times I get DocumentComplete event but this doesn't work either.
this.WebBrowser.IsBusy doesn't work either. It is always 'false' when checking it in the Document Complete handler.

c# html browser mshtml

Edit Report

Here's what finally worked for me:

       public bool WebPageLoaded
    {
        get
        {
            if (this.WebBrowser.ReadyState != System.Windows.Forms.WebBrowserReadyState.Complete)
                return false;

            if (this.HtmlDomDocument == null)
                return false;

            // iterate over all the Html elements. Find all frame elements and check their ready state
            foreach (IHTMLDOMNode node in this.HtmlDomDocument.all)
            {
                IHTMLFrameBase2 frame = node as IHTMLFrameBase2;
                if (frame != null)
                {
                    if (!frame.readyState.Equals("complete", StringComparison.OrdinalIgnoreCase))
                        return false;

                }
            }

            Debug.Print(this.Name + " - I think it's loaded");
            return true;
        }
    }

On each document complete event I run over all the html element and check all frames available (I know it can be optimized). For each frame I check its ready state. It's pretty reliable but just like jeffamaphone said I have already seen sites that triggered some internal refreshes. But the above code satisfies my needs.

Edit: every frame can contain frames within it so I think this code should be updated to recursively check the state of every frame.

answered 2009-03-26T10:12:10.987

HTML - How do I know when all frames are loaded?

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