June 2008
Beginner to intermediate
160 pages
4h 48m
Polish
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Rozdział 9. Reguła 7. Unikanie wyrażeń CSS
Wyrażenia CSS stanowią potężny (i niebezpieczny) sposób dynamicznego ustawiania właściwości CSS. Są obsługiwane w przeglądarce Internet Explorer, począwszy od wersji 5. Na początek zobaczmy, jak przedstawia się konwencjonalna reguła CSS definiująca kolor tła:
background-color: #B8D4FF;
W przypadku strony dynamicznej kolor tła może być zmieniany co godzinę za pomocą wyrażenia CSS:
background-color: expression((new Date().getHours()%2 ? "#B8D4FF" : "#F08A00");
Na powyższym przykładzie widać, że metoda expression akceptuje wyrażenia JavaScript. Wartością właściwości CSS będzie wynik działania wyrażenia JavaScript.
Metoda expression jest ignorowana przez inne przeglądarki internetowe. Dlatego też stanowi wygodne ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.