cftrace

Description

Displays and logs debugging data about the state of an application at the time the cftrace tag executes. Tracks runtime logic flow, variable values, and execution time. Displays output at the end of the request or in the debugging section at the end of the request; or, in Dreamweaver MX and later, in the Server Debug tab of the Results window.

ColdFusion logs cftrace output to the file logs\cftrace.log, in the ColdFusion installation directory.

Note: To permit this tag to execute, you must enable debugging in the ColdFusion MX Administrator. Optionally, to report trace summaries, enable the Trace section.

Syntax

<cftrace 
   abort = "Yes" or "No"
   category = "string"
   inline = "Yes" or "No"
   text = "string"
   type = "format"
   var = "variable_name"
</cftrace>

History

ColdFusion MX: Added this tag.

Attributes

Attribute	Req/Opt	Default	Description
abort	Optional	No	Yes: calls a `cfabort` tag when the tag is executed. No
category	Optional		User-defined string for identifying trace groups.
inline	Optional	No	Yes: displays trace code in line on the page in the location of the `cftrace` tag, in addition to the debugging information output. No
text	Optional		User-defined string, which can include simple variables, but not complex variables such as arrays. Outputs to the `cflog` `text` attribute.
type	Optional	Information	Corresponds to the `cflog` `type` attribute; displays an appropriate icon: Information Warning Error Fatal Information
var	Optional		The name of a simple or complex variable to display. Useful for displaying a temporary value, or a value that does not display on any CFM page.

Usage

You cannot put application code within this tag. (This avoids problems that can occur if you disable debugging.)

This tag is useful for debugging CFML code during application development.

You can display cftrace tag output in the following ways:

As a section in the debugging output
In-line in an application page, and as a section in debugging output. If you specify in-line tracing, ColdFusion flushes all output up to the cftrace tag, and displays the trace output when it encounters the tag.

This is an example of a log file entry:

"Information","web-4","04/08/02","23:21:30",   ,"[30 ms (1st trace)]      
[C:\CFusionMX7\wwwroot\generic.cfm @ line: 9] - 
   [thisPage = /generic.cfm]  "
"Information","web-0","04/08/02","23:58:58",   ,"[5187 ms (10)]  
[C:\CFusionMX7\wwwroot\generic.cfm @ line: 14] - [category]
   [thisPage = /generic.cfm] [ABORTED] thisPage "

For a complex variable, ColdFusion lists the variable name and the number of elements in the object; it does not log the contents of the variable.

Example

The following example traces a FORM variable that is evaluated by a cfif block:

<cftrace var="FORM.variable"
   text="doing equivalency check for FORM.variable"
   category="form_vars"
   inline="true">
<cfif isDefined("FORM.variable") AND #FORM.variable# EQ 1>
   <h1>Congratulations, you're a winner!</h1>
<cfelse>
   <h1>Sorry, you lost!</h1>
</cfif>

View comments in LiveDocs