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CFAjax: What it is and How to Use it


This is for ColdFusion aficionados who want to use Ajax. Ajax is implemented in such a way that ColdFusion method calls on the server gets executed using JavaScript a la Ajax. This tutorial shows you where to get the code and how to implement it on your local server.

Author Info:
By: Jayaram Krishnaswamy
Rating: 4 stars4 stars4 stars4 stars4 stars / 59
February 14, 2006
TABLE OF CONTENTS:
  1. · CFAjax: What it is and How to Use it
  2. · Implemented ColdFusion Function
  3. · CFAjax implementation of a ColdFusion function
  4. · Code Analysis: The External js files
  5. · MyCFAjax.htm file

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CFAjax: What it is and How to Use it - MyCFAjax.htm file
(Page 5 of 5 )

This file, in addition to the script file references, has three HTML tags, two of which are input elements and the third is a <span/> element. When the browser is displayed, one can enter values into the two text boxes (assumed numerical values, no validation has been set up). When the boxes get blurred (when you step out of the box after typing in the value), the function is evaluated and the result gets written to the <span/> element.

When the browser displays as the <body> loads, the init () function is evaluated. This in turn calls the loadInfo () function. The loadInfo () calls the DWRUtil which extracts the values sent by the clients at objects with ids x and y using the getValue () method. The DWREngine._execute () function uses these values; the function name; the function through the variable _cfscriptLocation;  and the result of running this function in getResult variable. The getResult () function passes the result using the HTML's DOM parser to the 'info' <span/> element. The result of the computation gets written to the <span/>.  The browser display of MyCFAjax.htm will be as shown:

Summary

One of the objectives in writing this tutorial was to introduce our readers to CFAjax. Another objective was to explain why some of the examples in the download may not work immediately. A detailed step-by-step procedure for creating a virtual directory referencing the downloaded directory has been described. The place where the user function needs to be appended is also shown using the virtual directory so created. An extremly simple example was chosen to highlight the use of the CFAjax code as related to its constituent external script files.  Template reference of <cfinclude> is not referenced absolutely; some examples may require this to be changed as well. I thank James Holmes for showing clear documentation for the DWREngine._execute() method.


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