You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@struts.apache.org by narayanan a <sn...@yahoo.com> on 2004/04/26 22:50:45 UTC
ArrayList and DynaActionForm
All,
I have an ArrayList in a DynaActionForm. I am
populating the ArrayList in my Action class and
displaying the list as text boxes in the JSP page.
When the user clicks on the submit button, Struts is
not able to put back the values into the ArrayList and
it throws IndexOutOfBoundsException. The form bean is
in request scope. This problem can be solved by
putting the form bean in session scope, but I do not
want to do that.
Any help would be appreciated.
Thanks
__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25�
http://photos.yahoo.com/ph/print_splash
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: name="params" in ?
Posted by Riyad Kalla <rs...@email.arizona.edu>.
Ahh ok I got you know, comments below:
Julia Weaver wrote:
>Thank you Riyad,
>
>Yes I want to do:
>
>
>>If you are asking how you can (a) create that
>>HashMap in a sciplet in a JSP
>>page AND put it into the session THEN (b) submit to
>>an Action and get it back
>>out of the session,
>>
>>
>
>
>
>In My jsp:
><%
>java.util.HashMap params2 = new java.util.HashMap();
>params2.put("p1", "1");
>params2.put("p2", "2");
>request.getSession(true).setAttribute("params2",
>params2);
>%>
>
>In my action class:
>String params2 =
>(String)request.getSession(true).getAttribute("params2");
>
>
This is the problem, in your JSP page you are putting a HashMap into
your session, then in your action you get getting the HashMap out, and
casting it to a String. Keep in mind there is NOTHING fancy about a
Session, its just a Hashtable. So if you put a HashMap in, from your JSP
page, then the only way you will get it out, is if you cast it
correctly. Your action code should look like:
HashMap params2 = (HashMap)request.getSession(true).getAttribute("params2");
System.out.println(params2.get("p1"); //output "1"
System.out.println(params2.get("p2"); // output "2"
Anytime you get confused about sessions or requests and the
get/setAttribute methods... remember they are just wrappers to
Hashtables and it all becomes clear again.
Best,
Riyad
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: name="params" in ?
Posted by Julia Weaver <dr...@yahoo.com>.
Thank you Riyad,
Yes I want to do:
> If you are asking how you can (a) create that
> HashMap in a sciplet in a JSP
> page AND put it into the session THEN (b) submit to
> an Action and get it back
> out of the session,
In My jsp:
<%
java.util.HashMap params2 = new java.util.HashMap();
params2.put("p1", "1");
params2.put("p2", "2");
request.getSession(true).setAttribute("params2",
params2);
%>
In my action class:
String params2 =
(String)request.getSession(true).getAttribute("params2");
But now I have this error:
[java/util/HashMap incompatible with
java/lang/String]: java.lang.ClassCastException:
java/util/HashMap incompatible with java/lang/String
Please give me further advice.
--- Riyad Kalla <rs...@email.arizona.edu> wrote:
> If you are asking how you can (a) create that
> HashMap in a scriplet in a JSP
> page and then (b) submit it to an Action, my answer
> is "I don't know".
>
> If you are asking how you can (a) create that
> HashMap in a sciplet in a JSP
> page AND put it into the session THEN (b) submit to
> an Action and get it back
> out of the session, my answer is "no problem, just
> do a
> request.getSession().getAttribute("params"); from
> within the action, you
> don't need to setup anything in your html:form"
>
>
> On Monday 26 April 2004 03:45 pm, Julia Weaver
> wrote:
> > Thanks for your response.
> > What I mean is without use any link on the page,
> only
> > use submit buttons, how can I get parameters? plus
> the
> > page has multiple submit buttons, so I have to use
> > LookupDispatchAction.
> >
> > --- Riyad Kalla <rs...@email.arizona.edu> wrote:
> > > I'm not terribly clear on what you are asking...
> > > your line:
> > > request.getSession(true).setAttribute("params",
> > > params);
> > >
> > > sets the 'params' variable in your session, so
> your
> > > link could actually just
> > > be a plan HTML link:
> > > <a href="/myapp/GetChildTool.do">Get Tool</a>
> > >
> > > and your action could still pull params out of
> your
> > > session and process it.
> > >
> > > Am I missing something?
> > >
> > > On Monday 26 April 2004 03:10 pm, Julia Weaver
> > >
> > > wrote:
> > > > Hi all,
> > > >
> > > > Please advise:
> > > > I know how to pass params when use <html:link>
> > >
> > > tag.
> > >
> > > > But if I want to <html:submit> tag instead,
> what I
> > > > should use to replace: name="params"? Since I
> > >
> > > cannot
> > >
> > > > use: <html:submit property="action"
> name="params"
> > >
> > > />
> > >
> > > > This is in my jsp:
> > > >
> > > > <%
> > > > java.util.HashMap params = new
> > >
> > > java.util.HashMap();
> > >
> > > > params.put("toolId", "thisId");
> > > > params.put("toolName", "thisName" );
> > > >
> request.getSession(true).setAttribute("params",
> > > > params);
> > > > %>
> > > >
> > > > <html:link page="/GetChildTool.do" name=
> "params"
> > > >
> > > > <bean:write name="tool" property="ToolNbr"/>
> > > > </html:link>
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > __________________________________
> > > > Do you Yahoo!?
> > > > Yahoo! Photos: High-quality 4x6 digital prints
> for
> > >
> > > 25�
> > >
> > > > http://photos.yahoo.com/ph/print_splash
> >
> >
>
---------------------------------------------------------------------
> >
> > > > To unsubscribe, e-mail:
> > >
> > > user-unsubscribe@struts.apache.org
> > >
> > > > For additional commands, e-mail:
> > >
> > > user-help@struts.apache.org
> >
> >
>
---------------------------------------------------------------------
> >
> > > To unsubscribe, e-mail:
> > > user-unsubscribe@struts.apache.org
> > > For additional commands, e-mail:
> > > user-help@struts.apache.org
> >
> > __________________________________
> > Do you Yahoo!?
> > Yahoo! Photos: High-quality 4x6 digital prints for
> 25�
> > http://photos.yahoo.com/ph/print_splash
> >
> >
>
---------------------------------------------------------------------
> > To unsubscribe, e-mail:
> user-unsubscribe@struts.apache.org
> > For additional commands, e-mail:
> user-help@struts.apache.org
>
>
---------------------------------------------------------------------
> To unsubscribe, e-mail:
> user-unsubscribe@struts.apache.org
> For additional commands, e-mail:
> user-help@struts.apache.org
>
__________________________________
Do you Yahoo!?
Win a $20,000 Career Makeover at Yahoo! HotJobs
http://hotjobs.sweepstakes.yahoo.com/careermakeover
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: name="params" in ?
Posted by Riyad Kalla <rs...@email.arizona.edu>.
If you are asking how you can (a) create that HashMap in a scriplet in a JSP
page and then (b) submit it to an Action, my answer is "I don't know".
If you are asking how you can (a) create that HashMap in a sciplet in a JSP
page AND put it into the session THEN (b) submit to an Action and get it back
out of the session, my answer is "no problem, just do a
request.getSession().getAttribute("params"); from within the action, you
don't need to setup anything in your html:form"
On Monday 26 April 2004 03:45 pm, Julia Weaver wrote:
> Thanks for your response.
> What I mean is without use any link on the page, only
> use submit buttons, how can I get parameters? plus the
> page has multiple submit buttons, so I have to use
> LookupDispatchAction.
>
> --- Riyad Kalla <rs...@email.arizona.edu> wrote:
> > I'm not terribly clear on what you are asking...
> > your line:
> > request.getSession(true).setAttribute("params",
> > params);
> >
> > sets the 'params' variable in your session, so your
> > link could actually just
> > be a plan HTML link:
> > <a href="/myapp/GetChildTool.do">Get Tool</a>
> >
> > and your action could still pull params out of your
> > session and process it.
> >
> > Am I missing something?
> >
> > On Monday 26 April 2004 03:10 pm, Julia Weaver
> >
> > wrote:
> > > Hi all,
> > >
> > > Please advise:
> > > I know how to pass params when use <html:link>
> >
> > tag.
> >
> > > But if I want to <html:submit> tag instead, what I
> > > should use to replace: name="params"? Since I
> >
> > cannot
> >
> > > use: <html:submit property="action" name="params"
> >
> > />
> >
> > > This is in my jsp:
> > >
> > > <%
> > > java.util.HashMap params = new
> >
> > java.util.HashMap();
> >
> > > params.put("toolId", "thisId");
> > > params.put("toolName", "thisName" );
> > > request.getSession(true).setAttribute("params",
> > > params);
> > > %>
> > >
> > > <html:link page="/GetChildTool.do" name= "params"
> > >
> > > <bean:write name="tool" property="ToolNbr"/>
> > > </html:link>
> > >
> > >
> > >
> > >
> > >
> > > __________________________________
> > > Do you Yahoo!?
> > > Yahoo! Photos: High-quality 4x6 digital prints for
> >
> > 25¢
> >
> > > http://photos.yahoo.com/ph/print_splash
>
> ---------------------------------------------------------------------
>
> > > To unsubscribe, e-mail:
> >
> > user-unsubscribe@struts.apache.org
> >
> > > For additional commands, e-mail:
> >
> > user-help@struts.apache.org
>
> ---------------------------------------------------------------------
>
> > To unsubscribe, e-mail:
> > user-unsubscribe@struts.apache.org
> > For additional commands, e-mail:
> > user-help@struts.apache.org
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Photos: High-quality 4x6 digital prints for 25¢
> http://photos.yahoo.com/ph/print_splash
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: name="params" in ?
Posted by Julia Weaver <dr...@yahoo.com>.
Thanks for your response.
What I mean is without use any link on the page, only
use submit buttons, how can I get parameters? plus the
page has multiple submit buttons, so I have to use
LookupDispatchAction.
--- Riyad Kalla <rs...@email.arizona.edu> wrote:
> I'm not terribly clear on what you are asking...
> your line:
> request.getSession(true).setAttribute("params",
> params);
>
> sets the 'params' variable in your session, so your
> link could actually just
> be a plan HTML link:
> <a href="/myapp/GetChildTool.do">Get Tool</a>
>
> and your action could still pull params out of your
> session and process it.
>
> Am I missing something?
>
> On Monday 26 April 2004 03:10 pm, Julia Weaver
> wrote:
> > Hi all,
> >
> > Please advise:
> > I know how to pass params when use <html:link>
> tag.
> > But if I want to <html:submit> tag instead, what I
> > should use to replace: name="params"? Since I
> cannot
> > use: <html:submit property="action" name="params"
> />
> >
> >
> > This is in my jsp:
> >
> > <%
> > java.util.HashMap params = new
> java.util.HashMap();
> > params.put("toolId", "thisId");
> > params.put("toolName", "thisName" );
> > request.getSession(true).setAttribute("params",
> > params);
> > %>
> >
> > <html:link page="/GetChildTool.do" name= "params"
> >
> > <bean:write name="tool" property="ToolNbr"/>
> > </html:link>
> >
> >
> >
> >
> >
> > __________________________________
> > Do you Yahoo!?
> > Yahoo! Photos: High-quality 4x6 digital prints for
> 25�
> > http://photos.yahoo.com/ph/print_splash
> >
> >
>
---------------------------------------------------------------------
> > To unsubscribe, e-mail:
> user-unsubscribe@struts.apache.org
> > For additional commands, e-mail:
> user-help@struts.apache.org
>
>
---------------------------------------------------------------------
> To unsubscribe, e-mail:
> user-unsubscribe@struts.apache.org
> For additional commands, e-mail:
> user-help@struts.apache.org
>
__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25�
http://photos.yahoo.com/ph/print_splash
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: name="params" in ?
Posted by Riyad Kalla <rs...@email.arizona.edu>.
I'm not terribly clear on what you are asking... your line:
request.getSession(true).setAttribute("params", params);
sets the 'params' variable in your session, so your link could actually just
be a plan HTML link:
<a href="/myapp/GetChildTool.do">Get Tool</a>
and your action could still pull params out of your session and process it.
Am I missing something?
On Monday 26 April 2004 03:10 pm, Julia Weaver wrote:
> Hi all,
>
> Please advise:
> I know how to pass params when use <html:link> tag.
> But if I want to <html:submit> tag instead, what I
> should use to replace: name="params"? Since I cannot
> use: <html:submit property="action" name="params" />
>
>
> This is in my jsp:
>
> <%
> java.util.HashMap params = new java.util.HashMap();
> params.put("toolId", "thisId");
> params.put("toolName", "thisName" );
> request.getSession(true).setAttribute("params",
> params);
> %>
>
> <html:link page="/GetChildTool.do" name= "params" >
> <bean:write name="tool" property="ToolNbr"/>
> </html:link>
>
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Photos: High-quality 4x6 digital prints for 25¢
> http://photos.yahoo.com/ph/print_splash
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
name="params" in ?
Posted by Julia Weaver <dr...@yahoo.com>.
Hi all,
Please advise:
I know how to pass params when use <html:link> tag.
But if I want to <html:submit> tag instead, what I
should use to replace: name="params"? Since I cannot
use: <html:submit property="action" name="params" />
This is in my jsp:
<%
java.util.HashMap params = new java.util.HashMap();
params.put("toolId", "thisId");
params.put("toolName", "thisName" );
request.getSession(true).setAttribute("params",
params);
%>
<html:link page="/GetChildTool.do" name= "params" >
<bean:write name="tool" property="ToolNbr"/>
</html:link>
__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25�
http://photos.yahoo.com/ph/print_splash
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: ArrayList and DynaActionForm
Posted by Richard Yee <ry...@yahoo.com>.
If you have a fixed # of elements or if you put the
count of elements in your form bean, you can put code
in your reset() method to initialize the List
attribute with the proper # of elements. This will
enable you to use request scope and not use the
LazyList. If you check the archives, I answered
another question about a week ago on this and provided
step-by-step instructions.
Regards,
Richard
--- narayanan a <sn...@yahoo.com> wrote:
> All,
>
> I have an ArrayList in a DynaActionForm. I am
> populating the ArrayList in my Action class and
> displaying the list as text boxes in the JSP page.
> When the user clicks on the submit button, Struts is
> not able to put back the values into the ArrayList
> and
> it throws IndexOutOfBoundsException. The form bean
> is
> in request scope. This problem can be solved by
> putting the form bean in session scope, but I do not
> want to do that.
>
> Any help would be appreciated.
>
> Thanks
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Photos: High-quality 4x6 digital prints for
> 25�
> http://photos.yahoo.com/ph/print_splash
>
>
---------------------------------------------------------------------
> To unsubscribe, e-mail:
> user-unsubscribe@struts.apache.org
> For additional commands, e-mail:
> user-help@struts.apache.org
>
__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25�
http://photos.yahoo.com/ph/print_splash
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: ArrayList and DynaActionForm
Posted by Hubert Rabago <ja...@yahoo.com>.
Use ListUtils.lazyList(). Search the mailing list archives for lazyList()
for examples and further explanation.
--- narayanan a <sn...@yahoo.com> wrote:
> All,
>
> I have an ArrayList in a DynaActionForm. I am
> populating the ArrayList in my Action class and
> displaying the list as text boxes in the JSP page.
> When the user clicks on the submit button, Struts is
> not able to put back the values into the ArrayList and
> it throws IndexOutOfBoundsException. The form bean is
> in request scope. This problem can be solved by
> putting the form bean in session scope, but I do not
> want to do that.
>
> Any help would be appreciated.
>
> Thanks
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Photos: High-quality 4x6 digital prints for 25�
> http://photos.yahoo.com/ph/print_splash
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25�
http://photos.yahoo.com/ph/print_splash
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org