By Ben Forta

ISBN-10: 0321679199

ISBN-13: 9780321679192

Written via the easiest identified and such a lot relied on identify within the ColdFusion neighborhood, Ben Forta, The ColdFusion net program building equipment is the best-selling ColdFusion sequence of all time - the books that the majority ColdFusion builders used to profit the product. This moment quantity of the sequence starts by way of introducing vital code association and administration recommendations, after which progresses to themes that come with integrating with every kind of alternative applied sciences (including PDF, Adobe Flex and information providers, Ajax, complex SQL and databases, ORM), debugging, and optimizing functionality. From layout and making plans, to program deployment and troubleshooting, this educational reference is all you want to effectively paintings, create, and development with ColdFusion nine. entire insurance of ColdFusion nine is integrated in "Volume 1, Getting began" (0-321-66034-X) and "Volume three, complicated software improvement" (0-321-67920-2).

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Additional info for Adobe ColdFusion 9 Web Application Construction Kit, Volume 2: Application Development

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If you supply a TYPE, ColdFusion will display an error message if someone tries to use the function with the wrong kind of input. required Optional. Whether the argument is required for the function to be able to do its work. , not required). default Optional. For optional arguments (that is, when required=”No”), this determines what the value of the argument should be if a value isn’t passed to the function when it is actually used. One of the neatest things about the UDF framework is how easy it is to create functions that have required arguments, optional arguments, or both: ■■ ■■ ■■ If a tag uses required=”Yes”, the argument must be provided when the function is actually used.

While UDFs allow you to make your own functions, custom tags let you create your own CFML tags. ColdFusion Components (CFCs). Conceptually, CFCs are similar to custom tags, but imply a more structured, object-oriented manner of programming. CFCs are also at the heart of ColdFusion’s Flash and Web Services integration. CFX Tags. It is also possible to write your own CFX tags in either Java or C++. For more information about writing CFX tags, see the ColdFusion documentation. Introducing CFML Custom Tags The UDF framework introduced in Chapter 22 is probably the easiest and most straightforward way to extend the language.

In this simple example, the only processing that needs to occur to generate the function’s output is a simple database query. As you can see, a special ARGUMENTS scope will contain the value of each argument when the function is actually used. filmID variable will be 8. filmID dynamically creates the SQL that will retrieve the appropriate film title from the database. All that’s left to do is to return the title as the function’s output, using the tag. It’s that easy. Using the Function Once you’ve written a UDF, you can use it just like any other function.

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Adobe ColdFusion 9 Web Application Construction Kit, Volume 2: Application Development by Ben Forta

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