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

Question

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

Answer 1

Here's my tested version. Just make this your DocumentCompleted Event Handler and place the code that you only want be called once into the method OnWebpageReallyLoaded(). Effectively, this approach determines when the page has been stable for 200ms and then does its thing.

// event handler for when a document (or frame) has completed its download
Timer m_pageHasntChangedTimer = null;
private void webBrowser_DocumentCompleted( object sender, WebBrowserDocumentCompletedEventArgs e ) {
    // dynamic pages will often be loaded in parts e.g. multiple frames
    // need to check the page has remained static for a while before safely saying it is 'loaded'
    // use a timer to do this

    // destroy the old timer if it exists
    if ( m_pageHasntChangedTimer != null ) {
        m_pageHasntChangedTimer.Dispose();
    }

    // create a new timer which calls the 'OnWebpageReallyLoaded' method after 200ms
    // if additional frame or content is downloads in the meantime, this timer will be destroyed
    // and the process repeated
    m_pageHasntChangedTimer = new Timer();
    EventHandler checker = delegate( object o1, EventArgs e1 ) {
        // only if the page has been stable for 200ms already
        // check the official browser state flag, (euphemistically called) 'Ready'
        // and call our 'OnWebpageReallyLoaded' method
        if ( WebBrowserReadyState.Complete == webBrowser.ReadyState ) {
            m_pageHasntChangedTimer.Dispose();
            OnWebpageReallyLoaded();
        }
    };
    m_pageHasntChangedTimer.Tick += checker;
    m_pageHasntChangedTimer.Interval = 200;
    m_pageHasntChangedTimer.Start();
}

OnWebpageReallyLoaded() {
    /* place your harvester code here */
}