Navigate (when click on Back button) goes to blank screen

[john.augustine]

Hi,

My browser data has Back button ( < ).

Now the issue is, a blank screen is displaying even though there is no previous page exist when i click on Back button.
I mean, need to stop navigating ( Back ) if there is no previous page exist.

Can you please provide your suggestion on this.

Kindly refer the attached screenshots.

Thanks & Regards,
John Augustine

[salvadordf]

CEF browsers load "about:blank" as the first page if you don't use the TChromium.DefaultURL property.
That's the blank screen the user sees when he/she presses the back button.

Set the TChromium.DefaultURL property to the first address you want to load before calling TChromium.CreateBrowser.

[john.augustine]

Thanks much for your suggestion/help.

Actually, we are using "LoadRequest" and not "LoadURL".

Kindly refer the attached screenshot.

Thanks,
John Augustine

[salvadordf]

Then use the TChromium.OnBeforeBrowse event to allow navigation to "about:blank" only one time.

[salvadordf]

I just edited the previous post with a better answer.

[john.augustine]

Hi,

Thanks much for your suggestion!

As you mentioned, I have tried this in TChromium.OnBeforeBrowse (kindly refer the attached screenshot (Before_Browse.JPG) for code) but couldn't achieve.

fRequest browser.MainFrame.LoadRequest(fRequest); > Assigning value for fRequest is at method "Display" (kindly refer the attached screenshot (LoadRequest.JPG) for code)

Thanks & Regards,
John

[john.augustine]

Hi,

Any help on my previous post?

Thanks & Regards,
John

[salvadordf]

Sorry, I forgot that "about:blank" is a special case that doesn't trigger the "OnBefore..." events in CEF.
https://magpcss.org/ceforum/viewtopic.php?f=6&t=15989
https://magpcss.org/ceforum/viewtopic.php?f=10&t=15950

Try this :

• Set the TChromium.DefaultURL to a DATA URL which includes your logo or your client's logo or a blank html file. It will be loaded before your request for a few tenths of a second only.
• Add the TChromium.OnBeforeBrowse to check that the previous DATA URL can only be loaded once.

[john.augustine]

Sure, I will try this.

Thanks Much!

Regards,
John