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May 25.2005

The following:

—————————————————————

<SCRIPT LANGUAGE=”JavaScript”><!–//
IE=(navigator.appName.indexOf(‘Microsoft’) >= 0);
NS=(navigator.appName.indexOf(‘Netscape’) >= 0);
V4=(parseInt(navigator.appVersion) >= 4);
V5=(parseInt(navigator.appVersion)>=5);
V5=(V5||navigator.appVersion.indexOf(“MSIE 5”)!=-1);
V5=(V5||navigator.appVersion.indexOf(“MSIE 6”)!=-1);
MAC=(navigator.userAgent.indexOf(‘Mac’)!=-1);//–>
</SCRIPT>

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JavaScript

3 Comments(s) ↴

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@UltimaterMay 25.2005 — [color=royalblue]navigator.appName[/color] returns a big long string with brower information.

Next, Every string has access to the [color=royalblue]indexOf[/color] function.

[color=royalblue]navigator.appName.indexOf('Microsoft')[/color] returns a number.

If the string doesn't contain "Microsoft" then the number is set to -1.

If the string [i]does[/i] contain "Microsoft" then the number can be set from anything from 0 through infinite depending on where the segement is located in the string.

since [color=royalblue]navigator.appName.indexOf('Microsoft')[/color] returns a number,

[color=royalblue](navigator.appName.indexOf('Microsoft') >= 0);[/color]

returns either true or false

Thus, the variable [b]IE[/b] will be set to either true or false.
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@phpnoviceMay 25.2005 — Nice description of what it [b][U]does[/U][/b] -- but not what it [b][U]means[/U][/b]. That code is called [I]"platform and browser sniffing"[/I] -- a.k.a., [I]"client sniffing"[/I]. It's purpose is to allow script to provide different logic branches depending upon the platform on which and the browser in which the script is running. To put that another way, it allows a script to function cross-platform and cross-browser in nearly the same fashion.

The following is out of date, but it gives you an idea of the complexity and the art of browser sniffing:

[URL=http://www.mozilla.org/docs/web-developer/sniffer/browser_type.html]Ultimate JavaScript Browser Sniffer[/URL]
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@Chris_2authorMay 25.2005 — thanks guys, I now understand it much better ?
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