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Using Variables in ColdFusion

Jan 10, 2003

📄 Contents

␡

Understanding Variables
Data Types
Variable Scopes
Naming Variables
Setting Values
Retrieving Values
Accessing CGI Variables
Example 2.1: Using CGI Variables
Passing Values
Example 2.2: Passing Variables Via the URL
Makeover Exercise
Summary

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Example 2.1: Using CGI Variables

In this example, we will create a ColdFusion template to display some commonly used CGI variables.

Open your editor and type the code shown in Listing 2.1, or you can open the CGIVariables.cfm file from the CompletedFiles\Examples\Step02 folder.

Listing 2.1 Commonly Used CGI Variables

<!––– 
File:    CGIVariables.cfm
Description: Displays some common CGI variables
Author:
Created:
–––>

<HTML>
<HEAD>
   <TITLE>Common CGI Variables</TITLE>
</HEAD>

<BODY>
<CFOUTPUT>
<!––– display some commonly used CGI variables –––>
<B>User's Browser Type:</B> HTTP_USER_AGENT = #CGI.HTTP_USER_AGENT#<BR>
<B>User's IP Address:</B> REMOTE_ADDR = #CGI.REMOTE_ADDR#<BR>
<B>Referring Page:</B> HTTP_REFERER = #CGI.HTTP_REFERER#<BR>
<B>Server's Name:</B> SERVER_NAME=#CGI.SERVER_NAME#<BR>
<B>Server's Port:</B> SERVER_NAME=#CGI.SERVER_PORT#<BR>
</CFOUTPUT>

</BODY>
</HTML>

Save this file into your Examples\Step02 directory as CGIVariables.cfm.
Use a URL to browse to the page. For example, http://localhost/Examples/Step02/CGIVariables.cfm.
You should see something similar to the page displayed in Figure 2.2.
To see HTTP_REFER information, set up a hyperlink to CGIVariables.cfm on another page and use the link to jump to CGIVariables.cfm.

Figure 2.2 CGIVariables.cfm browser display.

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