internet-explorer - 在MSHTML IE8中修改DOM时会触发事件吗？

尝试检测是否在MSHTML中的DOM中添加或删除了新元素。是否会发生此类事件？

http://msdn.microsoft.com/en-us/library/aa741877(v=VS.85).aspx

在IE9中有IDOMMutationEvent::initMutationEvent

http://msdn.microsoft.com/en-us/library/ff975905(v=vs.85).aspx

最佳答案

是的，尽管它不是MSHTML事件结构的一部分，但它是Accessibility，但现在可以在IE8中使用。

触发器(EVENT_OBJECT_REORDER)是IE8中的新增功能-请参见http://blogs.msdn.com/b/ie/archive/2008/12/10/new-accessibility-features-in-ie8.aspx?PageIndex=7

我们在没有BHO的情况下使用它，但是如果您选择的话，也可以在IE之外使用。

BHOClass::BHOClass()
{
if( TrackDHTML ) {
// end event is not used so +1.
// out of process notifications from accessibility
    m_eHook = ::SetWinEventHook(EVENT_OBJECT_REORDER, EVENT_OBJECT_REORDER+1, 0, MSAALib_WinEventProc, GetCurrentProcessId(), GetCurrentThreadId(), WINEVENT_OUTOFCONTEXT );
// in process injecting the dll into IE
//  m_eHook = ::SetWinEventHook(EVENT_OBJECT_REORDER, EVENT_OBJECT_REORDER+1, GetModuleHandle(L"yourhook.dll"), MSAALib_WinEventProc, GetCurrentProcessId(), GetCurrentThreadId(), WINEVENT_INCONTEXT );
}
}

这是您如何看待可访问性并获取文档/浏览器的方法

static void CALLBACK MSAALib_WinEventProc(HWINEVENTHOOK hook,
  DWORD event,
  HWND hwnd,  // this appears to be the hwnd for the tab and not the specific frame
  LONG idObject,
  LONG idChild,
  DWORD dwEventThread, // the thread being watched that triggered this call
  DWORD dwmsEventTime)
{
if( hwnd != NULL // exclude most mouse move
    && ( OBJID_WINDOW == idObject ) // || OBJID_CLIENT == idObject )
    )
{
    switch( event ) {
        case EVENT_OBJECT_REORDER: break;
        case EVENT_OBJECT_SHOW: break;
        case EVENT_OBJECT_HIDE: break;
        default:
            return;
    }

    Log(L"Event START - (%ld) object %ld on window(0x%x)%ld thread (0x%x)%ld\n", event, idObject, hwnd, hwnd, dwEventThread, dwEventThread);
    CComPtr<IAccessible> acc;
    VARIANT varChild;
    AccessibleObjectFromEvent(hwnd, idObject, idChild, &acc, &varChild);
    if( acc ) {
        // step 1 - change from Accessibility interface to html to check we have right type of reorder message
        CComPtr<IServiceProvider> provider;
        HRESULT hr = acc->QueryInterface(IID_IServiceProvider,(LPVOID *)&provider);
        if( SUCCEEDED(hr) && provider ){
            CComPtr<IHTMLElement> spElement;
            hr = provider->QueryService(IID_IHTMLElement,IID_IHTMLElement,(LPVOID *)&spElement);

            if( spElement ) {
                // step 2 - for this doc element get the service provider and then the browser element
                CComPtr<IServiceProvider> provider2;
                HRESULT hr = spElement->QueryInterface(IID_IServiceProvider,(LPVOID *)&provider2);
                CComPtr<IServiceProvider> provider3;
                if( provider2 )
                    hr = provider2->QueryService(SID_STopLevelBrowser,IID_IServiceProvider,(LPVOID *)&provider3);
                CComPtr<IWebBrowser2> browser;
                if( provider3 )
                    hr = provider3->QueryService(SID_SWebBrowserApp,IID_IWebBrowser2,(LPVOID *)&browser);

                if( browser ) {
                    // step 3 - Do stuff
                }
            }
        }
    }
    Log(L"Event DONE - (%ld) object %ld on window(0x%x)%ld thread (0x%x)%ld\n", event, idObject, hwnd, hwnd, dwEventThread, dwEventThread);
}
}