Is it possible to detect when the user switches tabs?

Question

In particular, I am interested in knowing whether it is possible to capture a user by clicking on another browser tab. I suppose that technically I could get the blur and focus of the window object, but if there was something more closely tied to the browser (IE, FF, Chrome, etc.), That would be even better.

Answer 1

IE

If you write your own code (i.e. a browser plug-in), you can use DWebBrowserEvents2 :: WindowStateChanged .

Here is a sample code to implement IDispatch::Invoke():

    // DWebBrowserEvents2
    case DISPID_WINDOWSTATECHANGED: {
        if (pDispParams) {
            DWORD dwMask  = pDispParams->rgvarg[0].lVal;
            DWORD dwFlags = pDispParams->rgvarg[1].lVal;

            // We only care about WINDOWSTATE_USERVISIBLE.
            if (dwMask & OLECMDIDF_WINDOWSTATE_USERVISIBLE)
            {
                bool visible = !!(dwFlags & OLECMDIDF_WINDOWSTATE_USERVISIBLE));

                // ... your code here ...
            }
        }
        break;
    }

, Javascript , , , .

Firefox

Firefox XUL, TabAttrModified selected. . MDC .