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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 - Code Analysis: The External js files
(Page 4 of 5 )

In the examples the relative references to these files are given. These have been changed in the present file (this tutorial) by giving absolute URL reference in the following three files.

<script type='text/javascript' src='http://
localhost/ajax/core/engine.js'></script> <script type='text/javascript' src='http://
localhost/ajax/core/util.js'></script> <script type='text/javascript' src='http://
localhost/ajax/core/settings.js'></script>

ColdFusion function reference

The function discussed earlier is used as shown here and is appended to the set of functions already present in the functions.cfm file in the examples folder. All examples reference file - functions.cfm from which the relevant function is processed during the XMLHTTP request.

<cffunction name="RightangleTriangle">
<cfargument name="x" required="yes" type="numeric">
<cfargument name="y" required="yes" type="numeric">
<cfset result=sqr(#x#*#x#+#y#*#y#)>
<cfreturn result>
</cffunction>

In the fourth <script/>, the _cfscriptLocation variable points to functions.cfm which also contains the function whose name is "RightangleTriangle" appended to it. The functions.cfm collects all the functions from several examples in the examples folder. An abbreviated version of functions.cfm is as shown below:

 

<!--- hint="type=keyvalue, jsreturn=array , listdelimiter=| , delimiter='='" --->
<cfinclude template="/ajax/core/cfajax.cfm">
<cffunction name="ziplookup">
<!---details of 'ziplookup' funciton--->
</cffunction>
<cffunction name="countylookup">
<!---details of 'countylookup' function-->
</cffunction>
<cffunction name="stateinfo">
<!---details of 'stateinfo' function--->
</cffunction>
<!---   ......   --->
<!---many other functions follow--->                                                                                 <!---   ......   --->
<cffunction name="RightangleTriangle">
<!---
details of function used in this tutorial-->
<cfargument name="x" required="yes" type="numeric">
<cfargument name="y" required="yes" type="numeric">
<cfset result=sqr(#x#*#x#+#y#*#y#)>
<cfreturn result>
</cffunction>



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