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What Kind of Errors Can Occur
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When designing any computer program, it is important to keep in mind that errors are likely to occur despite the programmer s best efforts to avoid them This is especially true of JavaScript programs that are used across a wide variety of browsers and operating systems When developing JavaScript code, you are likely to find the following sources of errors:
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Differences in the Document Object Model of each browser version Client computers running old browsers (such as Netscape 30) that do not support
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certain JavaScript functionality
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Client computers with certain technologies turned off, such as cookies or Java New web-enabled technologies, such as hand-held devices, mobile phones, and even
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appliances, such as refrigerators In this chapter, we will take a look at some of the common techniques for avoiding these types of errors
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Browser IE 6 IE 5 IE 4 Netscape 4 Netscape 6, Netscape 7, Mozilla (collectively) Older IE Older Netscape
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Source: TheCountercom (http://wwwthecountercom)
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TABLE 7-1
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Recent Web Browser Usage Statistics
How to Do Everything with JavaScript
Detect What Type of Browser the User Is Running
Running a modern or complex JavaScript program in an older browser is likely to cause numerous problems Perhaps the easiest way to avoid these types of errors is to detect what type of browser the user is running and then either disable some of the program features or provide alternative code that performs the same task in a slightly different manner Detecting the browser name and version information is often called browser sniffing Much as a bloodhound can detect the unique scent of an individual, a browser sniffer attempts to detect and return the unique details of the browser software To detect the browser manufacturer and version number, we will rely on the navigator DOM object The navigator object has several methods and properties, but the three that we are interested in at the present time are appName, appVersion, and userAgent
var browserString = navigatorappName; var browserVersion = navigatorappVersion; var browserAgent = navigatoruserAgent; alert (browserString); alert (browserVersion); alert (browserAgent);
Specifying JavaScript Version Numbers
The browser makers started off with the best of intentions Both Netscape and IE allow developers to specify a JavaScript version number within the language attribute of the <script> tag This prevents scripts from running in browsers that do not support the specified JavaScript version number To create a script that will only run in browsers that support JavaScript 12, you would use the following code:
<script language="JavaScript12">
The same can be done for all versions of JavaScript up to version 15 (A listing of JavaScript version numbers and how they relate to browsers can be found in 1) Unfortunately, very few web developers knew that this could be done, and fewer still actually used this technique when creating cross-browser scripts On top of that, this method does not help developers solve the DOM-related differences between the various browsers So, although this technique is still available, it cannot be relied on to solve cross-browser scripting problems
CHAPTER 7: Create Scripts That Work in Every Browser
For Netscape web browsers (including the open-source Mozilla web browser), the navigatorappName property always returns the same value regardless of the version or operating system
For Microsoft Internet Explorer, the navigatorappName property also returns a predictable value, regardless of the version
Therefore, if your web page needed to display different text depending on the browser a visitor was running, you could simply query the navigatorappName property, like so:
var browserString = navigatorappName; if (browserString == "Netscape") { // Do something for Netscape/Mozilla here documentwrite ("Long live the lizard"); } else if (browserString == "Microsoft Internet Explorer") { // Do something for Microsoft here documentwrite ("You will be assimilated"); } else { // The browser is not one of the major two documentwrite ("Why must you always be so different "); }
However, navigatorappName is extremely limited in the amount of information it provides Other navigator properties provide more useful information For instance, the
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