Thanks Andrew that spells it out nicely. Going for manual reset.
-----Original Message-----
From: Andrew Hill [mailto:[EMAIL PROTECTED]]
Sent: 19 November 2002 13:51
To: Struts Users Mailing List
Subject: RE: Loosing my parameter in the multipart request
The multipart request is indeed a different request object.
(It uses an org.apache.struts.upload.MultipartRequestWrapper)
Why?
Because getParameter() doesnt normally work on a multipart request! (Sun
give some excuses about not parsing it for you cos multipart submissions
arent a 'standard' or some such nonsense).
Struts has to parse the multipart request (which is submitted to the server
in quite a different format to a normal request) and it uses the class I
mentioned above to store the parsed values. This is one of the many 'value
added' features of struts that makes it cool - BUT the way it does it
currently is ... how to say it ... "not how I wouldd have done it" (and
before everyone asks me to write a patch - no I havent time right now. Maybe
in January I will but doing the 100 hour a week "salt mines" work mode right
now!)
This parsing occurs in the static populate() method of the RequestUtils
class - and it is called from the RequestProcessor.processPopulate() method.
Guess what method of your ActionForm is called BEFORE populate()...
Yep. The parameters for the multipart request are parsed AFTER reset() is
called. No soup for you! :-(
<btw>
And if that action isnt using a form at all (rather rare) your request isnt
populated at all!
</btw>
Now there is one possible (quick) workaround - but you won't like it. You
see while form fields that are submitted in the multipart request aren't
available in the standard HttpServletRequest implementation, those that are
appended as part of the url (ie /scooby.do?value1=bob&x=y etc...) are
available. You could modify your script to append the userAction value to
the forms action property.
Heres an (edited) example from my own code where I append reset=true to the
action url of entityForm if submit(true) is called. You can try modifying
your code to do something similar and see if it helps.
<snip>
function submit(reset)
{
try
{
if(reset)
{
document.entityForm.action =
appendParameter(document.entityForm.action,'reset','true');
}
document.entityForm.submit();
}
catch(error)
{
alert('Error caught by submit()\ntype=' + error.type + '\nname=' +
error.name);
throw error;
}
}
function appendParameter(url, parameter, value)
{
var delimeter = url.indexOf('?') == -1 ? '?' : '&';
return url + delimeter + parameter + '=' + value;
}
</snip>
-----Original Message-----
From: Murray, Christopher [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, November 19, 2002 21:12
To: 'Struts Users Mailing List'
Subject: Loosing my parameter in the multipart request
Hey there guys n gals,
I seem to be loosing a parameter of my request when I submit a multi-part
form.
In the page I have a,
<input type="hidden" name="userAction"/>
this is written to by a call to,
<a
href="javascript:submitFormDispatch('UploadForm','performUpload')">LINK</a>
which calls,
function submitFormDispatch( formname, value )
{
var form = document.forms[ formname ];
var elements = form.elements;
elements[ 'userAction' ].value = value;
alert("userAction =" + value);
form.submit();
}
Now I know this is working because the alert pops up to tell me.
When the reset method is called in the ActionForm I get a null pointer
exception because no parameter is found for the action mapping set in the
struts-config.xml,
<action path="/.../upload"
type="com...UploadAction"
name="UploadForm"
scope="session"
validate="true"
input="/.../upload.jsp"
parameter="userAction">
<forward name="displayInputForm"
path="/.../upload.jsp"></forward>
<forward name="confirmUpload"
path="/.../Upload_confirmed.jsp"></forward>
<forward name="fail" path="/.../error"/>
</action>
And then in the form I've been using,
public void reset(ActionMapping mapping, HttpServletRequest request){
FWLog log = FWLogManager.getLog("UploadActionForm");
log.debug("Entering UploadActionForm.reset");
System.out.println("mapping.getParameter() = " +
mapping.getParameter());
System.out.println("request.getParameter(mapping.getParameter()) =
");
System.out.println(request.getParameter(mapping.getParameter()));
System.out.println("request = " + request.toString());
if
(request.getParameter(mapping.getParameter()).equals(Constants.STAGE_ACTION_
METHOD)){
this.emailText = null;
contactId = null;
log.debug("email text has been reset.");
}
log.debug("Entering UploadActionForm.reset");
}
When all this executes this outputs
mapping.getParameter() = userAction
request.getParameter(mapping.getParameter()) =
null
request = org.apache.struts.upload.MultipartRequestWrapper@799ca4
java.lang.NullPointerException
at com...web.action.UploadActionForm.reset(Unknown Source)
Guessing that a Multipart request is a different request object.
Have you got any suggestions ?
Is this possible ?
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