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JavaScript for Web Design – Advantages and Disadvantages

This article discusses the pros and cons of using JavaScript in your website designs. It points out the areas where JavaScript excels as a web-based programming language and also describes situations where its use can actually degrade a website’s performance.

First of all, JavaScript is a browser-based programming language that actually runs the client. This means that any code you write in JavaScript is delivered along with your web pages and the scripts you write actually run from the user’s browser instead of directly on the server serving the web page. There are situations where JavaScript is an excellent solution to implement neat features in a web design, but there are also situations where the use of JavaScript can harm the performance of your websites. It is my goal in this article to describe the best ways to use JavaScript and how to circumvent the disadvantages of using this versatile and powerful scripting language.

JavaScript for Web Design – The Advantages

JavaScript is an excellent solution to implement when validating input forms from the client. This means that if a user forgets to enter their name in a form, for example, a JavaScript validation function can popup a message to let them know about the omission. This is a much better solution than having a server validation routine handle the error because the server does not have to do any additional processing. An asp or php routine could be written to achieve the same task, but the JavaScript will not allow the form to be submitted unless it has been properly completed in the first place, a much more robust solution!

Another area where JavaScript excels is in the creation of dynamic effects such as rollover images and scripted slideshows, where its use has become common. Because JavaScript runs in the client’s browser it can be used to change the appearance of the user’s screen after the page has been sent from the server. This allows you to create very impressive dynamic image effects.

JavaScript for Web Design – The Disadvantages

One of the main disadvantages to using JavaScript is that it tends to severely bloat web pages. JavaScript code can quickly add up to hundreds of lines of code if you use it to do anything even remotely interesting. That said, the problem of large pieces of JavaScript code is easily solved by storing the JavaScript code in separate JavaScript source files that have a .js extension. This cleans up your web page code because the JavaScript code is stored separately from the HTML page itself, leaving a much cleaner and more readable web page.

Because of JavaScript’s tendency to bloat web pages it can be very detrimental to the search engine friendliness of your website. This is because when a search engine arrives at your site looking for quality content and keywords to determine what your page is about, the last thing it wants to see is hundreds of lines of JavaScript code. Again, this problem is easily solved by storing JavaScript code in script files with a .js extension and linking to the script file in your HTML documents.

Conclusion:

JavaScript is a rich and useful browser-based script that, if used properly, can achieve some great effects and improve the experience for the end user. There are disadvantages to its use in that it tends to bloat web pages. The key thing to remember is to get the best of both worlds by using JavaScript code in external script files. In this way, the code is separated from your content to have all the benefits of JavaScript functionality, but without the adverse effects of associated code bloating.

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