Does instanceof work?
I've tried the Struts logic and the JSTL tag version of instanceof, like
these (below), but get errors returned implying that instanceof doesn't
exist as a valid option.
Does it exist? Am I doing something wrong? Can someone give me an example,
please?
Thanks,
Frank.
*** examples ***
logic:instanceof name=myBean className=foo.MyType
...
/logic:instanceof
c:if test=${myBean instanceof foo.MyType}
...
/c:if
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Recommend file upload progress bar
I have a requirement to display a progress bar while performing file uploads. I've found several frameworks that provide this functionality. However, can you recommend an existing *best* solution -- preferably off-the-shelf -- for use with Struts? Thanks, Frank - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
ActionForm necessary?
I have a jsp form which has fields that require no validation. So I don't need to validate the form input. If I don't include an ActionForm, I get a ... null form ... error message. Does this mean that I MUST create ActionForms, even if they are empty -- i.e., no validate() method and no getters/setters defined? Here's my mapping. The ActionForm referred to by saveDocHyperlinksForm is empty. So why can't I simply OMIT the name, scope and validate name/value pairs? action path=/saveDocHyperlinks type=com.domain.some.struts.SaveDocHyperlinksAction name=saveDocHyperlinksForm scope=request validate=false forward name=success path=/sysAdminModule/protectedPages/links.jsp / /action Thanks, Frank. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Strange behaviour?
I have a validate() method in my ActionForm class that includes some cleanup
(removes redundant whitespace) of some of the ActionForm bean's properties.
The related Action has validate=true set in struts-config. So validate()
should always be called.
The Action class then uses the ActionsForm's getters to read these
properties and saves them.
However, the saved properties have only been cleaned when errors are found
by the validate() method.
Why?
The validate() method is ALWAYS called and executes the cleanup methods on
the properties whether validate() discover errors or not, right?
Specifically, in the code below, the answer1, answer2, etc., are only
cleaned if there is an error found in the email address.
/*** code snippet ***/
public ActionErrors validate(
ActionMapping mapping,
HttpServletRequest request) {
/* clean redundant whitespace from answers properties */
answer1 = cleanWhitespace(answer1);
answer2 = cleanWhitespace(answer2);
answer3 = cleanWhitespace(answer3);
ActionErrors errors = new ActionErrors();
/*** validate email address ***/
/* check is email address is not empty */
if ((emailAddr == null) || (emailAddr.length() 1)){
errors.add(emailaddressempty,
new ActionError(errors.required.emailaddress));
}
...
return errors;
}
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Re: Struts starter
John,
You have answered my question perfectly! Thank you very much.
Thanks, also, to everyone else who has given their advice on this subject.
Frank.
- Original Message -
From: John McGrath [EMAIL PROTECTED]
To: 'Struts Users Mailing List' [EMAIL PROTECTED]
Sent: Monday, March 08, 2004 1:58 PM
Subject: RE: Struts starter
on the first hit to you personForm.do, or whatever (i presume you're not
hitting the jsp directly at any point), the backing Action class should
get the values from the validUser bean and populate the
PersonDetailsForm bean, which then gets used by the jsp. it sounds like
maybe you're using the values in the validUser bean directly with the
struts html:form... tags. i think what you have like this:
html:text name=validUser...
maybe should be this:
html:text name=PersonDetailsForm...
so the validUser bean is used by the Action classes, and the
PersonDetailsForm bean by the jsp, and logic in the Action classes
dictates when and how data is transfered between the two. validation
failure just redisplays the form (which should display what the user
just tried to enter, not the original data from validUser). validation
success might call another action that updated validUser with the new
info from PersonDetailsForm.
at least i think so, if i understand you correctly. works like that in
similar situations here.
-Original Message-
From: Frank Burns [mailto:[EMAIL PROTECTED]
Sent: Sunday, March 07, 2004 9:06 PM
To: Struts Users Mailing List
Subject: Re: Struts starter
John,
This is very good ...
Please bear with me for a final bit of clarification.
I neglected to explain that I had already created what you call the
PopulatePersonAction in your example and also set up the struts-config
as you suggested. I have the equivalent of this:
form-beans
form-bean name=personalDetailsForm
type=com.foo.PersonalDetailsForm
/
/form-beans
action path=/PersonForm type=com.foo.PopulatePersonAction
name=personalDetailsForm scope=request validate=true
input=/pages/PersonalDetails.jsp
forward name=success path=/pages/TheNextPageToCall.jsp /
/action
Note that the value assigned to the input parameter is
/pages/PersonalDetails.jsp.
In my PersonalDetails.jsp the action in the html:form tag is
PopulatePersonAction.
When I initially call PersonalDetails.jsp, there is already a validUser
bean in the session scope, representing the current, logged-in user. On
first being displayed, I want the fields of PersonalDetails.jsp to be
populated with data from the validUser bean. Say I have an emailAddress
field that I populate, like this: html:text name=validUser
property=emailAddress size=20 /.
Let's say the user enters some invalid data into the email address field
and then clicks the submit button.
The controller calls the personalDetailsForm and executes its validate()
method, which fails. Because of the failure, the controller then calls
PersonalDetails.jsp -- because it is the value in the input parameter
for the /PersonForm action defined in struts-config.
The newly called PersonalDetails.jsp now has access to the
PersonalDetailsForm form bean containing the data entered by the user.
HOWEVER, HOW WILL THE NEWLY CALLED PersonalDetails.jsp POPULATE THE
emailAddress FIELD WITH THE VALUE THAT THE USER ENTERED?
Won't it just re-display the value from the validUser bean? Because
that's how it's defined in the page, i.e., html:text name=validUser
property=emailAddress size=20 /.
Thanks,
Frank.
- Original Message -
From: John McGrath [EMAIL PROTECTED]
To: 'Struts Users Mailing List' [EMAIL PROTECTED]
Sent: Sunday, March 07, 2004 10:19 PM
Subject: RE: Struts starter
i'm a relative newcomer myself, but i think the part you're missing is
an Action class.
Put an entry in struts-config something like this:
action path=/PersonForm type=com.foo.PopulatePersonAction
name=PersonalDetailsForm scope=request validate=true
forward name=success path=/pages/PersonalDetails.jsp /
/action
Then write a PopulatePersonAction (or whatever) class that extends the
struts Action class. When you hit /PersonForm.do, PopulatePersonAction
can hit a datastore, create a DTO (validUser or whatever), and
transfer the values from your DTO to the form (probably using the
apache BeanUtils classes). When the Action class forwards to a mapping
('success'), the struts tags in the form will be able to access the
bean that was created by the Action class.
likewise, if you have the form submitting to a struts-config entry
that maps to another Action class, the validate method will be called
before the 'execute' method of the action mapped to the *.do that form
is submitting to. because the validate method is called after the form
bean has been populated, but before the Action class' 'execute' method
has been called, when the validate method
Re: Suggestion needed on good Struts book
I would say I'm smack bang in the middle of my Struts learning curve and, in my opinion, the single most useful resource I have found is this six-part series of articles: http://www.ftponline.com/javapro/2002_09/online/servletsjsp_bkurniawan_09_13_02/ In terms of books, I've got both Struts In Action and Programming Jakarta Struts. Each have their strengths and weaknesses in terms of the depth and breadth of information that they contain. However, in terms of *how* the information is presented, I personally find the Struts In Action really frustrating. It's as though the content has been *forced* into the In Action format. And the result, unfortunately, is that it works neither as a good hand-held tour through Struts (very long-winded, and repetitive), nor as a useful reference book (the useful information is scattered throughout its various sections). And, finally, I have the FOURTH *corrected* reprint, and it's still riddled with typos. My recommendation would be the above-mentioned series of articles and Programming Jakarta Struts. Frank. - Original Message - From: Janarthan Sathiamurthy [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Monday, March 08, 2004 8:23 AM Subject: Re: Suggestion needed on good Struts book Programming Jakarta Struts - OReilly [EMAIL PROTECTED] wrote:Hi, I am a newbie to Struts. I have been looking for books on Struts and found these on Amazon Programming Jakarta Struts - OReilly Struts in Action - Manning Struts Framework - Morgan Kaufmann Struts Survival Guide - ObjectSource Professional Jakarta Struts - Wrox Struts Kick Start - Sams Can anybody suggest which is good? Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - Do you Yahoo!? Yahoo! Search - Find what you're looking for faster. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Struts starter
John,
A final question on this, please.
How do I obtain *the* PersonalDetailsForm bean from the Action class so that
I can populate it?
Thanks,
Frank.
- Original Message -
From: John McGrath [EMAIL PROTECTED]
To: 'Struts Users Mailing List' [EMAIL PROTECTED]
Sent: Monday, March 08, 2004 1:58 PM
Subject: RE: Struts starter
on the first hit to you personForm.do, or whatever (i presume you're not
hitting the jsp directly at any point), the backing Action class should
get the values from the validUser bean and populate the
PersonDetailsForm bean, which then gets used by the jsp. it sounds like
maybe you're using the values in the validUser bean directly with the
struts html:form... tags. i think what you have like this:
html:text name=validUser...
maybe should be this:
html:text name=PersonDetailsForm...
so the validUser bean is used by the Action classes, and the
PersonDetailsForm bean by the jsp, and logic in the Action classes
dictates when and how data is transfered between the two. validation
failure just redisplays the form (which should display what the user
just tried to enter, not the original data from validUser). validation
success might call another action that updated validUser with the new
info from PersonDetailsForm.
at least i think so, if i understand you correctly. works like that in
similar situations here.
-Original Message-
From: Frank Burns [mailto:[EMAIL PROTECTED]
Sent: Sunday, March 07, 2004 9:06 PM
To: Struts Users Mailing List
Subject: Re: Struts starter
John,
This is very good ...
Please bear with me for a final bit of clarification.
I neglected to explain that I had already created what you call the
PopulatePersonAction in your example and also set up the struts-config
as you suggested. I have the equivalent of this:
form-beans
form-bean name=personalDetailsForm
type=com.foo.PersonalDetailsForm
/
/form-beans
action path=/PersonForm type=com.foo.PopulatePersonAction
name=personalDetailsForm scope=request validate=true
input=/pages/PersonalDetails.jsp
forward name=success path=/pages/TheNextPageToCall.jsp /
/action
Note that the value assigned to the input parameter is
/pages/PersonalDetails.jsp.
In my PersonalDetails.jsp the action in the html:form tag is
PopulatePersonAction.
When I initially call PersonalDetails.jsp, there is already a validUser
bean in the session scope, representing the current, logged-in user. On
first being displayed, I want the fields of PersonalDetails.jsp to be
populated with data from the validUser bean. Say I have an emailAddress
field that I populate, like this: html:text name=validUser
property=emailAddress size=20 /.
Let's say the user enters some invalid data into the email address field
and then clicks the submit button.
The controller calls the personalDetailsForm and executes its validate()
method, which fails. Because of the failure, the controller then calls
PersonalDetails.jsp -- because it is the value in the input parameter
for the /PersonForm action defined in struts-config.
The newly called PersonalDetails.jsp now has access to the
PersonalDetailsForm form bean containing the data entered by the user.
HOWEVER, HOW WILL THE NEWLY CALLED PersonalDetails.jsp POPULATE THE
emailAddress FIELD WITH THE VALUE THAT THE USER ENTERED?
Won't it just re-display the value from the validUser bean? Because
that's how it's defined in the page, i.e., html:text name=validUser
property=emailAddress size=20 /.
Thanks,
Frank.
- Original Message -
From: John McGrath [EMAIL PROTECTED]
To: 'Struts Users Mailing List' [EMAIL PROTECTED]
Sent: Sunday, March 07, 2004 10:19 PM
Subject: RE: Struts starter
i'm a relative newcomer myself, but i think the part you're missing is
an Action class.
Put an entry in struts-config something like this:
action path=/PersonForm type=com.foo.PopulatePersonAction
name=PersonalDetailsForm scope=request validate=true
forward name=success path=/pages/PersonalDetails.jsp /
/action
Then write a PopulatePersonAction (or whatever) class that extends the
struts Action class. When you hit /PersonForm.do, PopulatePersonAction
can hit a datastore, create a DTO (validUser or whatever), and
transfer the values from your DTO to the form (probably using the
apache BeanUtils classes). When the Action class forwards to a mapping
('success'), the struts tags in the form will be able to access the
bean that was created by the Action class.
likewise, if you have the form submitting to a struts-config entry
that maps to another Action class, the validate method will be called
before the 'execute' method of the action mapped to the *.do that form
is submitting to. because the validate method is called after the form
bean has been populated, but before the Action class' 'execute' method
has been called, when the validate method forwards back to the input
form (the default
Struts starter
Hi, I'm in the middle of working with my first application using Struts and desperately need some help. I've read nearly all of Ted Husted's Struts In Action book and browsed the mailing list archives but have not found a solution for what I want to do. I mention this to let you know that I have already tried hard, unsuccessfully, to find an answer to what seems to me to be a basic requirement. However, I may be struggling with my own misunderstanding! HERE'S THE BACKGROUND I have a session bean (validUser) and I want to use its properties to initially populate a PersonalDetails form. Then I want to use the validate() method of the related ActionForm (PersonalDetailsForm) to check the newly submitted details and, if failing validation, redisplay them in the PersonalDetails form, so that the user can correct them. HERE'S THE QUESTION: Where and how do I initialize (prepopulate) the form fields with the properties from the validUser bean, but then enable them to be populated with the information entered by the user when the form fails validation? HERE'S WHAT I'VE TRIED I've tried using html:text ... tags in the form, but they only seem to accept values from either the default form bean or from a specified bean -- so that seems only to a give a single source for populating the fields. Thanks, Frank.
Re: Struts starter
John,
This is very good ...
Please bear with me for a final bit of clarification.
I neglected to explain that I had already created what you call the
PopulatePersonAction in your example and also set up the struts-config as
you suggested.
I have the equivalent of this:
form-beans
form-bean name=personalDetailsForm type=com.foo.PersonalDetailsForm
/
/form-beans
action path=/PersonForm type=com.foo.PopulatePersonAction
name=personalDetailsForm scope=request validate=true
input=/pages/PersonalDetails.jsp
forward name=success path=/pages/TheNextPageToCall.jsp /
/action
Note that the value assigned to the input parameter is
/pages/PersonalDetails.jsp.
In my PersonalDetails.jsp the action in the html:form tag is
PopulatePersonAction.
When I initially call PersonalDetails.jsp, there is already a validUser bean
in the session scope, representing the current, logged-in user. On first
being displayed, I want the fields of PersonalDetails.jsp to be populated
with data from the validUser bean. Say I have an emailAddress field that I
populate, like this: html:text name=validUser property=emailAddress
size=20 /.
Let's say the user enters some invalid data into the email address field and
then clicks the submit button.
The controller calls the personalDetailsForm and executes its validate()
method, which fails. Because of the failure, the controller then calls
PersonalDetails.jsp -- because it is the value in the input parameter for
the /PersonForm action defined in struts-config.
The newly called PersonalDetails.jsp now has access to the
PersonalDetailsForm form bean containing the data entered by the user.
HOWEVER, HOW WILL THE NEWLY CALLED PersonalDetails.jsp POPULATE THE
emailAddress FIELD WITH THE VALUE THAT THE USER ENTERED?
Won't it just re-display the value from the validUser bean? Because that's
how it's defined in the page, i.e., html:text name=validUser
property=emailAddress size=20 /.
Thanks,
Frank.
- Original Message -
From: John McGrath [EMAIL PROTECTED]
To: 'Struts Users Mailing List' [EMAIL PROTECTED]
Sent: Sunday, March 07, 2004 10:19 PM
Subject: RE: Struts starter
i'm a relative newcomer myself, but i think the part you're missing is
an Action class.
Put an entry in struts-config something like this:
action path=/PersonForm type=com.foo.PopulatePersonAction
name=PersonalDetailsForm scope=request validate=true
forward name=success path=/pages/PersonalDetails.jsp /
/action
Then write a PopulatePersonAction (or whatever) class that extends the
struts Action class. When you hit /PersonForm.do, PopulatePersonAction
can hit a datastore, create a DTO (validUser or whatever), and transfer
the values from your DTO to the form (probably using the apache
BeanUtils classes). When the Action class forwards to a mapping
('success'), the struts tags in the form will be able to access the bean
that was created by the Action class.
likewise, if you have the form submitting to a struts-config entry that
maps to another Action class, the validate method will be called before
the 'execute' method of the action mapped to the *.do that form is
submitting to. because the validate method is called after the form bean
has been populated, but before the Action class' 'execute' method has
been called, when the validate method forwards back to the input form
(the default behavior on failure to validate), i think the user's newly
submitted fields should be prepopulated, so long as you used the
html:form... tags for the form.
This seemed unnecessarily complicated to me when i started using struts,
but we soon found that if we kept things suitably atomic, the extra
effort up front quickly paid of in code reusability (we reuse our action
classes like mad) and standardization. good luck!
john
-Original Message-
From: Frank Burns [mailto:[EMAIL PROTECTED]
Sent: Sunday, March 07, 2004 4:15 PM
To: [EMAIL PROTECTED]
Subject: Struts starter
Hi,
I'm in the middle of working with my first application using Struts and
desperately need some help. I've read nearly all of Ted Husted's Struts
In Action book and browsed the mailing list archives but have not found
a solution for what I want to do. I mention this to let you know that I
have already tried hard, unsuccessfully, to find an answer to what seems
to me to be a basic requirement. However, I may be struggling with my
own misunderstanding!
HERE'S THE BACKGROUND
I have a session bean (validUser) and I want to use its properties to
initially populate a PersonalDetails form. Then I want to use the
validate() method of the related ActionForm (PersonalDetailsForm) to
check the newly submitted details and, if failing validation, redisplay
them in the PersonalDetails form, so that the user can correct them.
HERE'S THE QUESTION:
Where and how do I initialize (prepopulate) the form fields with the
properties from the validUser bean, but then enable them to be populated
with the information
