Getting Acquainted with CFML in Java

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Getting Acquainted with CFML

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Figure 3-2: CFML gets parsed at the server and rendered as HTML

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If you want to display a pound sign within a <CFOUTPUT> tag, just put two pound signs together, and they will be displayed as one For example, the following expression prints Dial #0 for an Operator: <CFOUTPUT> Dial ##0 for an Operator</CFOUTPUT>

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Putting a tag to work

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Creating a ColdFusion page can be as simple as writing a few lines of code that answer the age old question, What is two plus two We created a brief example that demonstrates how to answer the question as a ColdFusion page Here s the code: <HTML> <HEAD> <TITLE>CFML Tags</TITLE> </HEAD> <BODY> <CFOUTPUT>two plus two equals #2+2#</CFOUTPUT> </BODY> </HTML>

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The preceding sample looks a lot like HTML because most of it is HTML The addition of the CFML tag (<CFOUTPUT>) and a cfm extension to the filename of the page turns a simple HTML page into a ColdFusion page Here are the steps to create your own cfm page: 1 Open your favorite HTML text editor Dreamweaver 8 in Code view works well 2 Enter the text of the sample CFML page (from the preceding example) 3 Save your work as fourcfm in a directory running the ColdFusion Application Server On IIS in Windows, this is generally C:/inetpub/wwwroot Check out Book VII, 2 for more information on setting up your ColdFusion Application Server 4 Load the page in your browser If you saved the page in the default location (like wwwroot), the URL should be http://localhost/fourcfm, as shown in Figure 3-3

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Figure 3-3: Two plus two equals four!

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Getting Acquainted with CFML

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Of course, the HTML that is sent to the browser is what s really important If you view the source of your page while it s displayed in the browser, you see that the <CFOUTPUT> tags have been removed and that the simple addition (2+2) between the pound signs has been replaced by the sum The HTML should look like this: <HTML> <HEAD> <TITLE>CFML Tags</TITLE> </HEAD> <BODY> two plus two equals 4 </BODY> </HTML>

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Working with variables

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When you are writing CFML, you may want to store information in memory for later use, which is exactly what a variable does A variable is a named container used to temporarily store information Sometimes the value of a variable comes from an external source, such as a Web form; other times, you create the variables yourself In ColdFusion, you can use the <CFSET> tag to create a variable A <CFSET> tag looks like this: <CFSET team_name= Pin Pals > This tag sets the value of a variable called team_name to the text string Pin Pals

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Naming variables

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You can name your variables just about anything you want, but you should always follow a few rules: Variables must consist of letters, numbers, and underscores only Variables should not start with a number Variables should not contain spaces Variables are case-insensitive (LAST_NAME is the same as last_name) Usually, you want to choose a name that is clear and concise The name should be long enough to fully describe the contents of the variable but not so long that it takes too long to type Table 3-2 summarizes some good and bad choices for variable names ColdFusion also has a set of reserved

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words that can t be used for variables, such as anything starting with cf_, scope names such as session or form, or CFML script language names For a complete listing of the reserved words, check out the Reserved Words section in the CFML Reference, which can be found by choosing Help Using ColdFusion from within Dreamweaver 8

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Table 3-2

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Bad Name add CustomerBilling AddressLine1 x First Name Good Name address

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Variable Names

Reason

The name add is too short and could be confusing Long names take longer to type The name x does not describe the value Variables cannot have spaces in their names

Getting Acquainted with CFML in Java Generator Code 39 Full ASCII in Java Getting Acquainted with CFML

Getting Acquainted with CFML in Java

Generator Code 39 Full ASCII in Java Getting Acquainted with CFML