Great Tutorial -- thanks
By: Justice
<!---//-------------------------------------------------------------
Writing a chart to a file and then displaying it using a .CFC
Written by Chris Peterson, override11@gmail.com
I have always had erratic problems displaying a chart directly
to the end users screen. I have yet to figure out why I have
these problems, but if I write the chart to a variable, and then
save it to a file and display it, it always works perfect.
Here is a .cfc I wrote to dynamically write a chart to a folder
you specify inside this .cfc. It would be easy for you to
modify so you could pass as an additional arguemnt what sub-folder
you want to place the charts in, I have this hard-coded to a sub-folder
named 'charts'.
To use this CFC, simply do your CFCHART tag as you always would
normally, only add the NAME='MyChartName' parameter (which instead
of returning the chart to the screen, will write it to a variable
named 'MyChartName'. Then invoke the CFC like this:
<cfinvoke component="Chart" method="WriteChartToFile" returnvariable="OutputChart">
<cfinvokeargument name="ChartName" value="#MyChartName#">
<cfinvokeargument name="Height" value="200">
<cfinvokeargument name="Width" value="350">
<cfinvokeargument name="chartformat" value="flash">
</cfinvoke>
Then, to display the resulting file, simply this!
<cfoutput>#OutputChart#</cfoutput>
----------------------------------------------------------//--->
<!---// Begin code for Chart.cfc //--->
Writing a chart to a file and then displaying it using a .CFC
Written by Chris Peterson, override11@gmail.com
I have always had erratic problems displaying a chart directly
to the end users screen. I have yet to figure out why I have
these problems, but if I write the chart to a variable, and then
save it to a file and display it, it always works perfect.
Here is a .cfc I wrote to dynamically write a chart to a folder
you specify inside this .cfc. It would be easy for you to
modify so you could pass as an additional arguemnt what sub-folder
you want to place the charts in, I have this hard-coded to a sub-folder
named 'charts'.
To use this CFC, simply do your CFCHART tag as you always would
normally, only add the NAME='MyChartName' parameter (which instead
of returning the chart to the screen, will write it to a variable
named 'MyChartName'. Then invoke the CFC like this:
<cfinvoke component="Chart" method="WriteChartToFile" returnvariable="OutputChart">
<cfinvokeargument name="ChartName" value="#MyChartName#">
<cfinvokeargument name="Height" value="200">
<cfinvokeargument name="Width" value="350">
<cfinvokeargument name="chartformat" value="flash">
</cfinvoke>
Then, to display the resulting file, simply this!
<cfoutput>#OutputChart#</cfoutput>
----------------------------------------------------------//--->
<!---// Begin code for Chart.cfc //--->
<cffunction
name="WriteChartToFile"
returntype="string"
hint="Accept parameters and return a string that is the code necessary to display a .swf file">
<cfargument
name="chartname"
type="any"
required="true"
hint="Pass in a variable that contains the cfchart flash data">
<cfargument
name="width"
type="any"
required="true"
hint="Pass in a numeric width for the resulting chart">
<cfargument
name="height"
type="any"
required="true"
hint="Pass in a numeric height for the resulting chart">
<cfargument
name="chartformat"
type="any"
required="true"
hint="Pass the chart type you are giving me. Valid types are flash,jpg, or png">
<!--- figure out file name extension based on chart type --->
<cfswitch expression="#Arguments.chartformat#">
<cfcase value="flash"><cfset Fileext = '.swf'></cfcase>
<cfcase value="png"><cfset Fileext = '.png'></cfcase>
<cfcase value="jpg"><cfset Fileext = '.jpg'></cfcase>
</cfswitch>
<!--- First, generate a random file name --->
<cfset filename = RandRange(10000, 99999) & '#fileext#'>
<cftry>
<cfif FileExists(#ExpandPath('charts/' & filename)#)>
<cffile action="delete" file="#ExpandPath('images/' & filename)#">
</cfif>
<cfcatch type="any"></cfcatch>
</cftry>
<cflock name="ReservationChart" type="exclusive" timeout="10">
<cffile
action="write"
charset="ISO-8859-1"
file="#ExpandPath('charts/' & filename)#"
output="#arguments.chartname#"
addnewline="yes">
</cflock>
<cfset tempstring = "<div style='z-index:-5;' align='left'><object><param name='movie' value='charts/#filename#'>
<embed src='charts/#filename#' width='#Arguments.Width#' height='#Arguments.Height#'></embed>
</object></div>">
<cfset returnstring = '#Replace(tempstring, "'", """", "ALL")#'>
<cfreturn returnstring>
</cffunction>
<!---// END chart.cfc //--->
About This Tutorial
Author: Justice
Total Views: 21,117
Submission Date: January 14, 2005
Last Update Date: June 05, 2009
All Tutorials By This Autor: 4
Skill Level: Intermediate
Platforms Tested: CFMXTotal Views: 21,117
Submission Date: January 14, 2005
Last Update Date: June 05, 2009
All Tutorials By This Autor: 4
Discuss This Tutorial
Advertisement
