how to print barcode in asp net c# BEST PRACTICES in Font

Generating QR Code in Font BEST PRACTICES

CHAPTER 5 BEST PRACTICES
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Assembling and placing scripts
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Most of the examples in the book use external script files that are included in the document using the <script> element, similar to this: <script rc="script/function.js"></script> Using external files is the best solution for including JavaScript because it s unobtrusive, it s cleanly separated from the markup, and it allows the browser to reuse the same cached script on multiple pages of your site. Ideally, however, you don t want to do something like this: <script <script <script <script src="script/functionA.js"></script> src="script/functionB.js"></script> src="script/functionC.js"></script> src="script/functionD.js"></script>
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A much better solution would be to combine functionA.js, functionB.js, functionC.js, and functionD.js into a single file. Reducing the number of requests required to load a page is probably the number one thing you can do to improve the overall load time of your website. The placement of your scripts in the markup also plays a big part in initial load times. Traditionally, we were told to always place scripts in the <head> portion of the document, but there's a problem with that. Scripts in the <head> block the browser s ability to download additional files (such as images or other scripts) in parallel. In general, the HTTP specification suggests that browsers download no more than two items at the same time per hostname. While a script is downloading, however, the browser won t start any other downloads, even on different hostnames, so everything must wait until the script has finished. If you re following the progressive enhancement and unobtrusive methodologies discussed earlier in the chapter, then moving your <script> tags shouldn t be an issue. You can make your pages load faster simply by including all your <script> tags at the end of the document, directly before the </body> tag. When the scripts load, your window load events will still apply your changes to the document.
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Minification
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Once you have your scripts written, optimized, and placed accordingly in your document, there s one last thing you can do to speed things up: minification. Minification refers to the process of taking your script and compressing it by removing the unnecessary bits such as whitespace and comments. Thankfully, there are tools to do this for you. Some minimizers will even rewrite portions of your code to use shorter variable names. This reduces the overall file size. For example, suppose you have some code that looks like this: function showPic(whichpic) { // Grab the pics href attribute. var source = whichpic.getAttribute("href"); // Get the placeholder. var placeholder = document.getElementById("placeholder"); // Update the placeholder source. placeholder.setAttribute("src",source); // Update the text description using the image's title attribute. var text = whichpic.getAttribute("title"); var description = document.getElementById("description"); } The minified version would look like this:
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CHAPTER 5 BEST PRACTICES
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function showPic(a){var b=a.getAttribute("href");document.get ElementById("placeholder").setAttribute("src",b);a.getAttribute ("title");document.getElementById("description")}; Minified code isn t pretty or human-readable, but it can make a big difference in file size. In most cases, you ll need to keep two copies: a working copy, in which you can make changes and comments, and the minified copy, which you serve up on your site. As a standard convention, a good idea it to include min in the file name of minified files to distinguish them from their nonminified counterparts: <script src="scripts/scriptName.min.js"></script> A number of different tools are available to do minification, including the following: Douglas Crockford s JSMin (http://www.crockford.com/javascript/jsmin.html) Yahoo! s YUI Compressor (http://developer.yahoo.com/yui/compressor/) Google s Closure Compiler (http://closure-compiler.appspot.com/home)
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Each has additional features that you can take advantage of for even more minification if required.
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What s next
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This chapter introduced some important concepts and practices that should be at the heart of any DOM scripting you do: Graceful degradation Unobtrusive JavaScript Backward compatibility Performance considerations
You ve seen how we can learn from other technologies like Flash and CSS to ensure that JavaScript is used wisely. A cautious, questioning attitude certainly seems to be a desirable trait when you re writing scripts.
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