People often have identical sections of code spread throughout many ASP pages, typically code at the top of the page (usually referred to as the header) and the lower part of the page (the footer). Similarly, you may have code that performs a certain set of instructions that you are repeating across multiple pages. Consider an example:-
<%
If foobar="yes" then
response.write "YES!"
Else
response.write "NOT YES!"
End if
%>
Ok, ok... it's simple, but imagine that you used this on multiple pages. What's wrong with this picture?
Well... you don't have to think about that long before realising that if you ever wanted to change something about that piece of code, you'd have your work cut out. you would have to change every page... everyone has done this at some stage and luckily most usually take the steps to learn a way around this problem.
If we could save our valuable chunk of code into a file and have that file accessed whenever we needed the code, then we no longer have a problem when it comes to changing things, as we simply update one file. Include files or Server Side Includes (SSI) as they are more commonly known are a powerful way to not only save time when it comes to maintaining and updating a site, but also increase efficiency and speed of that site too!
Ok, lets see how we use an include file... to start with we need to use one of two methods. The first one allows for including files relatively. By that I mean relative to the directory the ASP file that is using the include file resides. The second method includes files virtually. Including files virtually means that the path is taken from the root directory.
Consider that we are going to have a file (/main/somefile.asp) include another file (/includes/someinclude.asp).
To demonstrate, relative inclusion, look at this:-
<%
Response.Write "executing included code now"
%>
<!--#include file="../includes/someinclude.asp"-->
<%
Response.write "done executing included code"
%>
And here, we give an example of the other method, virtual inclusion:-
<%
Response.Write "executing included code now"
%>
<!--#include virtual="/includes/someinclude.asp"-->
<%
Response.write "done executing included code"
%>
Note the slight difference between the two methods. With virtual inclusion, you can move the file that calls upon the include file anywhere without affecting the outcome, because the path is always relative to the root. The same cannot be said however for relative inclusion. If you move a file that is using relative inclusion to a different directory, you'll most likely find the relative path is no longer correct.
From the examples above, you may also notice that both methods, when calling the include do so OUTSIDE of the ASP script block. This because #include declarations are not interpreted by ASP. Include files are included before a single line of ASP is processed which means the following WONT work:-
%lt;%
Page=request.form("page")
%>
<!--#include file="../includes/<%=page%>.asp"-->
We were attempting to perform a dynamic include and I would be the first to admit that the above would be very useful indeed if in fact it were possible. I do intend to cover a few methods that work around this set back but I know you will now be itching to get started right away on using include files to even worry about this, so I will cover it in a future article.
I hope that you have found the above informative and hope it inspires you all to write code that's more efficient and more easily maintained.
Rob Collyer, experienced with 20 years programming knowledge and site administrator of www.webforumz.com - Copyright 2003-2004
eco-friendly cleaning service Park Ridge ...This simple question can take on several different forms, but... Read More
Your ObjectiveYour small business needs an appealing and professional website... Read More
If you like the Internet and surfing through the billions... Read More
"How do I improve web site sales figures?" The CEO... Read More
That's right. Your method, behavior and strategy you are now... Read More
Go to any internet marketing forum you want these days... Read More
To the starting internet entrepreneur, there is nothing more discouraging... Read More
"I am a writer, not a business-person. I don't want... Read More
Are you aware that 90% of the websites on the... Read More
It is an undeniable fact that not everybody is keen... Read More
A PHP Redirect automatically transfers a web user from one... Read More
If you have your own business website and you are... Read More
As increasing numbers of people search for information on the... Read More
Failure, just like success, is measured differently by each and... Read More
When used to describe a web site, the term "sticky"... Read More
1. SiteSpinner V2 - On Sale www.deprice.com/sitespinner.htmSiteSpinner is a user-friendly... Read More
If you're anything like most small business owners, you probably... Read More
Many executives and investors are skeptical that software products can... Read More
1. Upload robots.txt file in to your root directory and... Read More
Internet has opened a whole new world for web developers... Read More
See how you can create graphic effects on text with... Read More
Conceptualize, Build and Publish a Web site - What's required... Read More
Cost Effective Advertising. Online selling. Increased geopgraphic range. Wider... Read More
Through the explosive growth of the Web, companies have realized... Read More
Now that you have got your domain name registered, your... Read More
personalized cleaning services Northbrook ...1. As the first step, "Hire a web designer."First create... Read More
What is CSS?CSS is a simple file which controls the... Read More
The Internet is being used by local service business to... Read More
An additional benefit of website accessibility is an improved performance... Read More
Are you aware that 90% of the websites on the... Read More
Three way linking and concerns.For many years SEO experts were... Read More
If you're an up and coming graphic/web designer just out... Read More
If you are developing your website on a host that... Read More
Dance is how you pamper your soul and satiate your... Read More
The "robots" meta tag, when used properly, will tell the... Read More
Go to any internet marketing forum you want these days... Read More
So you want to take a look at a real... Read More
When I set up my website I felt paypal was... Read More
Losing website sales and traffic is sometimes simply a case... Read More
Many of site owners still don't realize all advantages of... Read More
Web accessibility has so many benefits that I really do... Read More
Anyone who knows anything about web accessibility knows that images... Read More
Right after the thought, "I need a website," people usually... Read More
In this example I have used the map of the... Read More
One of my most salient memories from when I sold... Read More
Have you ever wondered what challenges are faced by other... Read More
If you are looking for creating your online presence you... Read More
There was a time not long ago when setting up... Read More
There's been widespread speculation about the new legislation being introduced... Read More
Profiles are one of the best kept secrets around regarding... Read More
Web Development |