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ColdFusion 9 Developer Tutorial

You're reading from   ColdFusion 9 Developer Tutorial Create robust professional web applications with ColdFusion

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Product type Paperback
Published in Jul 2010
Publisher Packt
ISBN-13 9781849690249
Length 388 pages
Edition 1st Edition
Languages
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Author (1):
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John Farrar John Farrar
Author Profile Icon John Farrar
John Farrar
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Table of Contents (22) Chapters Close

ColdFusion 9 Developer Tutorial
Credits
About the Author
About the Reviewers
1. Preface
1. Web Pages—Static to Dynamic 2. Basic CFCs and Database Interaction FREE CHAPTER 3. Power CFCs and Web Forms 4. ORM Database Interaction 5. Application, Session, and Request Scope 6. Authentication and Permissions 7. CFScript 8. CF AJAX User Interface 9. CF AJAX Forms 10. CF AJAX Programming 11. Introduction to Custom Tags 12. ColdFusion Powered Views 13. Control Logic Processing 14. Guide to Unit Testing Beyond this Book Tools and Resources Index

Using an object constructor


We will modify our code just a little bit to correct the missing variable using the constructor init() method. Modify the createObject line by adding .init(); to the end as shown in the following highlighted line. You will find that you can tack on a method you want to call at the time of creating an object, all on the same line. This is a common method among developers. When you use a constructor, you should always return the this variable to the caller. this is the variable scope of an object that refers to itself and this returns a reference to the object itself. That will correctly pass the object back when you place the constructor at the end of the creation of the object. If you look at the init method in the CFC, you will find that we include it with the <cfreturn this>.

<!--- Example: 2_2b.cfm --->
<!--- Processing --->
<cfscript>
  objProduct = createObject("component","product_1").init();

You will also notice that we are pulling...

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ColdFusion 9 Developer Tutorial
Published in: Jul 2010
Publisher: Packt
ISBN-13: 9781849690249
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