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Q&A

Q1: What if my page requires a particular plug-in? Is there a way to detect that with JavaScript?
A1: Yes, the navigator object includes properties for detecting plug-ins. These are described in Hour 20, “Working with Multimedia and Plug-Ins.” However, this method doesn't work in Internet Explorer.
Q2: Can I detect the user's email address using the navigator object or another technique?
A2: No, there is no reliable way to detect users' email addresses using a non-signed script. (If there was, you would get hundreds of advertisements in your mailbox every day from companies that detected your address as you browsed their pages.) You can use a signed script to obtain the user's email address, but this requires the user's permission.
Q3: Do I need to worry about browsers besides Netscape and Internet Explorer, since they don't support JavaScript anyway?
A3: Actually, there is a Windows browser called Opera that supports JavaScript, and you never know when a new browser may come out. It's always best to support all of them if you can. To learn more about Opera, visit its Web page at http://www.operasoftware.com.


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