Using External JavaScript Files by Amrit Hallan
When you have lots of JavaScript functions and you plan to use them on many web
pages, it is always advisable to keep them in a separate file, and then include
that file on every page where those functions are required. This way, you can
better organize them, you don't have to copy/paste the code again and again
(imagine if it runs to 100 or more lines!!), and you'll be forced to write more
generalized code for better integration and scalability.
Besides, enclosing the common JavaScript routines in external files keeps your
web pages uncluttered and search engine spiders and crawlers are able to reach
the important content easily. They don't have to shuffle through tens of lines
of scripts.
In the first edition [that appeared in my newsletter - BYTESWORTH REACHOUT] of
my article I had omitted the process of creating the external JavaScript files,
but when one of my readers asked me how to do it, I had to re-write the
article.
It's very simple. Use any text editor of your liking (if you hand-code your
HTML, you can use the same editor that you use for your HTML editing). Write
the required code, and save the file with .js (dot js) extension.
I'm going to give you a small example.
Suppose your JavaScript file is "myjfuncs.js".
and it has a function to return the bigger number of the two supplied as
parameters (you can simply start with the function, no need to write
<script> or some other stuff):
function bigger(num1, num2) { var holdbig; if (num1<num2) { holdbig=num2; }
else if(num1>num2) { holdbig=num1; } else { holdbig=num1; } return holdbig;
}
In a similar manner, we can have
function smaller(num1, num2) {
}
When we want to use this precious file full of JavaScript functions, we use
this line:
<script language="JavaScript" type="text/javascript" src="myjfuncs.js">
</script>
So when we use one of its functions in a JavaScript:
<script language="javascript">
var n1=90; var n2=7; alert ("The bigger number is: " + bigger(n1, n2));
</script>
In this way, we can use all the complex functions contained in the myjfuncs.js
file.
About the Author
Amrit Hallan is a freelance web designer. For all web site development and web
promotion needs, you can get in touch with him at amrit@bytesworth.com or
http://www.bytesworth.com. For more such articles, visit
http://www.bytesworth.com/articles You can subscribe to his newsletter
[BYTESWORTH REACHOUT] on Web Designing Tips & Tricks by sending a blank
email at bytesworth-subscribe@topica.com
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