Description
Displays and logs debugging data about the state of an application at the time the cftrace tag executes. Tracks run-time 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.
To permit this tag to execute, enable debugging in the ColdFusion Administrator. Optionally, to report trace summaries, enable the Trace section
Category
Syntax
var = "variable name" text = "string" type = "format" category = "string" inline = "yes|no" abort = "yes|no"> </cftrace>
You can specify this tag's attributes in an attributeCollection attribute whose value is a structure. Specify the structure name in the attributeCollection attribute and use the tag's attribute names as structure keys.
See also
History
ColdFusion MX: Added this tag.
Attributes
Attribute |
Req/Opt |
Default |
Description |
|---|---|---|---|
abort |
Optional |
no |
|
category |
Optional |
|
User-defined string that identifies trace groups. |
inline |
Optional |
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:
|
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
Inline in an application page, and as a section in debugging output. If you specify inline tracing, ColdFusion flushes all output up to the cftrace tag, and displays the trace output when it encounters the tag.
The following is an example of a log file entry:"Information","web-4","04/08/02","23:21:30", ,"[30 ms (1st trace)]
[C:\CFusion\wwwroot\generic.cfm @ line: 9] -
[thisPage = /generic.cfm]"
"Information","web-0","04/08/02","23:58:58", ,"[5187 ms (10)]
[C:\CFusion\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:
| 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> |
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