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Strange Tab Key Handling on some sites

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Stefan Koell

Posted: Tuesday, February 16, 2021 5:41:15 AM

Rank: Advanced Member
Groups: Member

Joined: 12/23/2013
Posts: 114

Hi,

I have a strange issue on a couple of web sites. For example: https://www.vmware.com/patchmgr/findPatch.portal

This is a login page and I'm sending these keystrokes to the application using the SendInput API (https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-sendinput):
{TAB}test@bla.com{TAB}this is a test

It seems that in this particular case, the tab key moves the caret to the next input element but it also adds a \t (tab character) to the password field:
Screenshot

I then startet to investigate the IInputMsgFilter in hope I can take over control and correct the behavior. I added the following code in my PreDispatchMsg:

Code: C#

Copy

if (Msg == WM_KEYDOWN && wParam.ToInt32() == VK_TAB)
            {
                WebView?.SendKeyEvent(true, KeyCode.Tab);
                WebView?.SendKeyEvent(false, KeyCode.Tab);
                return InputMsgTarget.None;
            }

This helped partially. I now don't have the tab in the password input but now I have a blank at the end of the username field:
Screenshot

Interestingly the blank at the end of the username also appears if I just hit the tab key on the keyboard (without any SendInput API involved).

Any idea what's going on or how to resolve this issue?

Thanks!
Stefan

eo_support

Posted: Wednesday, February 17, 2021 3:22:13 PM

Rank: Administration
Groups: Administration

Joined: 5/27/2007
Posts: 24,217

Hi,

What version do you use? We tested this with the latest build (21.0.32) and it seems to work fine. We use this API to test:

https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.sendkeys?view=net-5.0

Our steps are as follow:

1. Create a Windows.Forms app;
2. Place a Button and a Timer in the Form;
3. When the Button is clicked, we start the Timer;
4. In the meantime we open TabbedBrowser sample application and load the above page;
5. Click the content of the page to make sure the focus is on the page;
6. Eventually the Timer is triggered and the code in the timer calls:

SendKeys.Send("{TAB}test@bla.com{TAB}this is a test");

This worked correctly for us. Can you try the same and see if it works for you?

Thanks

Stefan Koell

Posted: Friday, February 19, 2021 8:20:38 AM

Rank: Advanced Member
Groups: Member

Joined: 12/23/2013
Posts: 114

Hi,

I tested the latest release and I could still see the issue. I did some more digging and I found out that the PreDispatchMsg receives also WM_CHAR message for the VK_TAB. I extended the InputMsgFilter with the following code:

if (Msg == WM_CHAR && wParam.ToInt32() == VK_TAB)
{
return InputMsgTarget.None;
}

This seems to resolve the issue.

Regards,
Stefan

eo_support

Posted: Friday, February 19, 2021 9:12:42 AM

Rank: Administration
Groups: Administration

Joined: 5/27/2007
Posts: 24,217

OK. Glad that you found a solution!

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