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c#internet-explorermshtml

getElementById on element within an iframe

My current code works on elements outside of an iframe. How should I approach fetching elements within an iframe using getElementById? My end goal is to write text within the the <body id="tinymce"><p>...</p></body> tags. I am not using a webBrowser control - this is for an external instance of iexplore

HTML Sample

enter image description here

Code Sample

foreach (InternetExplorer ie in new ShellWindowsClass())
{
    if (ie.LocationURL.ToString().IndexOf("intranet_site_url") != -1)
    {
        IWebBrowserApp wb = (IWebBrowserApp)ie;
        while (wb.Busy) { Thread.Sleep(100); }
        HTMLDocument document = ((HTMLDocument)wb.Document);

        // FETCH BY ID
        IHTMLElement element;
        HTMLInputElementClass hitem;

        element = document.getElementById("tinymce");
        hitem = (HTMLInputElementClass)element;
        hitem.value = first_name;

        // FETCH BY ID in IFRAME
        IHTMLFramesCollection2 hframes = document.frames;
        for (int i = 0; i < hframes.length; i++)
        {
            object ref_index = i;
            IHTMLWindow2 currentFrame = (IHTMLWindow2)hframes.item(ref ref_index);

            if (currentFrame != null)
            {
                MessageBox.Show(currentFrame.name);
                // what to do from here?
            }
            else
                MessageBox.Show("Null");
        }
    }
}

- update idea Chance of adapting my idea below?

if (currentFrame != null)
{
    MessageBox.Show(currentFrame.name);

    HTMLDocument document_sub = ((HTMLDocument)currentFrame.document);
    IHTMLElement element_sub;
    HTMLInputElementClass hitem_sub;

    element_sub = (document_sub.getElementById("tinymce"));
    hitem_sub = (HTMLInputElementClass)element_sub;
    try
    {
        hitem_sub.value = first_name;

        // the above will produce...
        // InvalidCastException: Unable to cast COM object of type 'mshtml.HTMLBodyCLass' to class type 'mshtml.HTMLInputElementClass'
    }
    catch { }
}
Solution

  • Try this:

    Windows.Forms.HtmlWindow frame = WebBrowser1.Document.GetElementById("decrpt_ifr").Document.Window.Frames["decrpt_ifr"];
HtmlElement body = frame.Document.GetElementById("tinymce");
body.InnerHtml = "Hello, World!";

    That gets the frame and treats it as a different document (because it is) and then it tries to get the element from its id. Good luck.

    Edit: This should do the trick taking advantage of the dynamic datatype, and InternetExplorer interface:

    private void Form1_Load(object sender, EventArgs e)
{
    foreach (InternetExplorer ie in new ShellWindows())
    {
        if (ie.LocationURL.ToString().IndexOf("tinymce") != -1)
        {
            IWebBrowserApp wb = (IWebBrowserApp)ie;
            wb.Document.Frames.Item[0].document.body.InnerHtml = "<p>Hello, World at </p> " + DateTime.Now.ToString();
        }
    }
}