September 2001
Intermediate to advanced
640 pages
31h 42m
English
Content preview from Web Design in a Nutshell, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Handling Multiple Browsers
Unlike CGI scripts, which run on the server and don’t require any particular intelligence on the part of the browser, JavaScript code is completely dependent on browser support. If you put a script on your page, browsers that don’t understand JavaScript won’t know what to do with it. As I mentioned earlier, these browsers will interpret the code as straight text, and the result is rather unpleasant.
It’s even more unpleasant, however, when your code isn’t completely understood by a JavaScript-aware browser. As we’ve already discussed, different browsers, and different versions of the same browser, support different versions of JavaScript. A poorly written script can generate error messages or even crash a user’s browser, which discourages return visits. Fortunately, JavaScript provides ways to target the browsers that understand specific JavaScript elements.
Checking for Browsers
If you have a script that you know works in Netscape 6 and IE 5.5 but doesn’t work in older browsers, you may want to check browser versions and serve your script to users of the browsers in which it works, but not to users of older browsers. Using the techniques shown in this section, you can serve different scripts to different browsers. This means you can write different scripts for people using the latest browser versions and for users of the Version 4.0 browsers, for example. And you can also have an HTML-only option for browsers that don’t support JavaScript (or have it ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.