ColdFusion: how to get the filename of failed upload - coldfusion

Question

I am trying to put the filename of a failed upload into an email, inside a try / catch, but I am not having any luck.
Based on this documentation - FileUploadAll() - I decided I am going to use error.
<cftry>
<cffile destination="#FULLPATH#" action="upload" nameconflict="ERROR" continueOnError="true" filefield="FileName" />
<cfcatch type="Any" >
<cf_EmailHandler from="testmail#gmail.com" to="testmail#gmail.com" subject="Attachment Error - #BUILD_SEARCH.PROJECT_VERSION# #BUILD_SEARCH.BUILD_NUMBER#">
<CFOUTPUT>
Attachment Error - #BUILD_SEARCH.PROJECT_VERSION# #BUILD_SEARCH.BUILD_NUMBER#
Cannot upload the following file:
#FULLPATH# #ArrayLen(cffile.uploadAllErrors)#
</CFOUTPUT>
</cf_EmailHandler>
<b>Error:</b>File already exists.
<cfabort>
</cfcatch>
</cftry>
I get the following error:
Element UPLOADALLERRORS is undefined in CFFILE
So I try to fix that:
<cftry>
<cffile destination="#FULLPATH#" action="upload" nameconflict="ERROR" Errors="errorResult" continueOnError="true" filefield="FileName" />
<cfcatch type="Any" >
<cf_EmailHandler from="testmail#gmail.com" to="testmail#gmail.com" subject="Attachment Error - #BUILD_SEARCH.PROJECT_VERSION# #BUILD_SEARCH.BUILD_NUMBER#">
<CFOUTPUT>
Attachment Error - #BUILD_SEARCH.PROJECT_VERSION# #BUILD_SEARCH.BUILD_NUMBER#
Cannot upload the following file:
#FULLPATH# #ArrayLen(errorResult.uploadAllErrors)#
</CFOUTPUT>
</cf_EmailHandler>
<b>Error:</b>File already exists.
<cfabort>
</cfcatch>
</cftry>
Then I am getting:
Element UPLOADALLERRORS is undefined in ERRORRESULT.
Any idea on what I am doing wrong or another way to display the name of failed upload? Also I am using ColdFusion 11.

Answer 1

Update:
Bug report CF-4204290 currently lists this issue as "To Fix".
TL;DR;
It's a documentation bug. The continueOnError attribute isn't supported with action=upload. Use action=uploadAll instead. Keep in mind "uploadAll" supports multiple files, so results will be returned as an array of structures.
The reason it's not working is because the code is using the wrong "action". It should be action="uploadAll". Since you're using continueOnError="true", CF populates a structure with any errors that occur. By default it uses CFFILE, but you can specify a different variable name by using the errors attribute.
<cffile destination="c:/some/path/"
action="uploadAll"
nameconflict="ERROR"
continueOnError="true"
filefield="file_path" />
Update:
As pointed out in the comments, the documentation does saycontinueOnError is a supported attribute for action=upload. However, IMO it's a documentation bug. Adobe probably just copied the text from the action=uploadAll description.
Interestingly, the documentation for FileUpload(), doesn't list that attribute at all. Bug report CF-4199503 confirms the function version doesn't support it. Based on my tests below with CF11 and CF2016, I've concluded it's not supported in either version.
Test Action=UploadAll
Uploading a file that already exists in the destination directory, doesn't cause a hard error. CF populates the specified variable with error details and dumps them on screen:
<cfif structKeyExists(FORM, "submit")>
<cffile destination="c:/temp"
action="uploadAll"
nameconflict="ERROR"
continueOnError="true"
errors="myErrors"
filefield="file_path" />
<cfdump var="#cffile#" label="cffile">
<cfdump var="#myErrors#" label="errors">
</cfif>
<form method="POST"
enctype="multipart/form-data">
<input type="file" name="file_path">
<input type="submit" name="test">
</form>
Results:
Test Action=Upload
Change the action to action="upload" and the code fails. ColdFusion does NOT:
Continue processing after the error .. or
Populate cffile with error information ... or
Create a result variable named by the errors attribute
Results:
Note, omitting the optional errors attribute produces the same results. It works as expected when using action=uploadAll and fails with an error when using action=upload

Answer 2

In the form page, I captured the filename using JavaScript
<Input Name="FileName" type="file" size="#TEXT_AREA_WIDTH#"><br><br>
<Input type="Hidden" id="READ_FILE_NAME" name="READ_FILE_NAME" value="">
<Input type="Submit" name="Operation" value="Save" onclick="return validateAttachmentForm(this.form.FileName.value)">
function validateAttachmentForm(file_name)
{
if (file_name.lastIndexOf("\\" != -1)) {
var file_name = file_name.substring(file_name.lastIndexOf("\\") + 1, file_name.length);
}
document.getElementById("READ_FILE_NAME").value = file_name;
if(file_name != "")
{
return true;
} else{
alert('Please select a file to upload.')
return false;
}
}
In the next page, I just display the filname passed in
<cftry>
<cffile destination="#FULLPATH#" action="upload" nameconflict="ERROR" Errors="errorResult" continueOnError="true" filefield="FileName" />
<cfcatch type="Any" >
<cf_EmailHandler from="testmail#gmail.com" to="testmail#gmail.com" subject="Attachment Error - #BUILD_SEARCH.PROJECT_VERSION# #BUILD_SEARCH.BUILD_NUMBER#">
<CFOUTPUT>
Attachment Error - #BUILD_SEARCH.PROJECT_VERSION# #BUILD_SEARCH.BUILD_NUMBER#
Cannot upload the following file:
#FULLPATH#\#form.READ_FILE_NAME#
</CFOUTPUT>
</cf_EmailHandler>
<b>Error:</b>File already exists.
<cfabort>
</cfcatch>
</cftry>