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The problem with relying on code that checks for browsers by name and version is that it s not foolproof Currently, about 96 percent of web surfers use one of the two major browsers Netscape or IE But what about the other 4 percent surfers who choose another brand, such as Opera or Konqueror New browsers are being developed, and web sites will not work reliably if they are only coded to work with the top two brands The other problem is that as new versions of IE and Netscape are released, support for different features changes For instance, Netscape 4 supported a layout method called layers, but support was later dropped when Netscape 6 came out (We will discuss layers more in the section entitled Write Cross-Browser Code ) The easiest way to get around the problem of the wide variety of available browsers (both in the present and in the future) is to write code that checks to see if a DOM method exists before attempting to use it The first official version of the Document Object Model (known as DOM 1) defines a method of the document object called getElementById() Recent browsers (such as IE 5 and Netscape 6) support it, but older browsers do not Simply calling the getElementById() method in a browser that does not support it will cause an error:
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var objptr = documentgetElementById("carname");
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So if you wanted to check to see if the current browser supports the getElementById() method before using it, you would simply query the document object to see if it has a member by that name before calling it:
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if (documentgetElementById) { var objptr = documentgetElementById("carname"); }
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The preceding code will work in any browser, since browsers that do not support that method will not execute the code inside the if statement Of course, in those browsers, the variable objptr would not be set, so it is best to have alternate code to handle those situations:
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if (documentgetElementById) { var objptr = documentgetElementById("carname"); } else { alert ("Sorry, this web page will not work in your browser"); }
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Of course, if you have to surround each and every call to a DOM method with its own if statement, your program will be long and inefficient So the best approach may be to combine the browser sniffing method with the DOM detection method to get the best of both worlds
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In the early days of web development, the two largest browser makers were competing aggressively for market share perhaps too aggressively One of their favorite tactics was to try to outdo each other in terms of features Consumers would download and install the newest release of their favorite browser, and within days the next release would be available for download Large companies, who sometimes require months to test and approve new software for use, found themselves up to two full versions behind the current release Of course, this led to two HTML standards instead of one, which made the web developer s job a lot more complicated than it had to be Luckily for us, both Microsoft and Netscape eventually decided that they would hold off implementing new HTML and JavaScript features until they were approved by a standards committee However, as a result of the early wild West mentality, there are a number of nonstandard coding practices that should be avoided in order to achieve cross-platform compatibility Table 7-2 contains a list of elements that are not part of the HTML 4 standard These proprietary markup tags should be avoided if you wish to create web pages that work consistently in any browser If you want to check your web page to see if it conforms to the official standards, the W3C web site provides an HTML validation service at http://validatorw3org This tool is the easiest way to see how far your web page deviates from the official standards It even identifies any HTML code that contains problems
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