Attach an event handler to mshtml.DispHTMLInputElement

Question

I am busy writing BHO (browser helper object) in C # and I need to bind event handlers to all onclick events on input elements. I do NOT use the built-in web browser provided by visual studio, instead I launch a new instance of Internet Explorer installed on the client PC. The problem occurs when using different versions of IE.

In IE7 and IE8, I can do this as follows:

public void attachEventHandler(HTMLDocument doc)
{
  IHTMLElementCollection els = doc.all;
  foreach (IHTMLElement el in els)
  {
    if(el.tagName == "INPUT")
    {
      HTMLInputElementClass inputElement = el as HTMLInputElementClass;
      if (inputElement.IHTMLInputElement_type != "text" && InputElement.IHTMLInputElement_type != "password")
      {
        inputElement.HTMLButtonElementEvents_Event_onclick += new HTMLButtonElementEvents_onclickEventHandler(buttonElement_HTMLButtonElementEvents_Event_onclick);
      }
    }
  }
}

This works fine, the fact is that IE6 throws an error when casting in HTMLInputElementClass, so you are forced to throw in DispHTMLInputElement:

public void attachEventHandler(HTMLDocument doc)
{
  IHTMLElementCollection els = doc.all;
  foreach (IHTMLElement el in els)
  {
    if(el.tagName == "INPUT")
    {
      DispHTMLInputElement inputElement = el as DispHTMLInputElement;
      if (inputElement.type != "text" && inputElement.type != "password")
      {
        //attach onclick event handler here
      }
    }
  }
}

The problem is that I cannot find a way to bind the event to a DispHTMLInputElement object. Any ideas?

Answer 1

, , , System_ComObject DispHTMLInputElement, mshtml. [events]. , IE6 :

public void attachEventHandler(HTMLDocument doc)
{
  IHTMLElementCollection els = doc.all;
  foreach (IHTMLElement el in els)
  {
    if(el.tagName == "INPUT")
    {
      DispHTMLInputElement inputElement = el as DispHTMLInputElement;
      if (inputElement.type != "text" && inputElement.type != "password")
      {
        HTMLButtonElementEvents_Event htmlButtonEvent = inputElement as HTMLButtonElementEvents_Event;
        htmlButtonEvent.onclick += new HTMLButtonElementEvents_onclickEventHandler(buttonElement_HTMLButtonElementEvents_Event_onclick);
      }
    }
  }
 }

, , passwaord , DispHTMLInputElement