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From "Nicholas L Mohler" <Nicholas_L_Moh...@raytheon.com>
Subject Re: Indexed Properties
Date Tue, 29 Jul 2003 18:19:17 GMT





Hi Atta

Just to clatify:
1)  You have a form that contains a "blocks" property which is a collection
of "test.Block" objects.
2)  The "test.Block" object has the following properties(get/set methods
for each): id, name, and category
3)  As we discussesed in our earlier emails, you have the get/set methods
for the "blocks" property in your form.
4)  You also have a singular "getBlock" method that takes an int (index)
and returns the "Block" object from the collection for the given index.

A couple possible causes for the error:
-  Item 4) is not implemented correctly.  You need the method shown below.
Note that since your form is in the session, you shouldn't need the
"sizing" logic.
public Block getBlock(int index) {
  while (index >= this.blocks.size()) {
    this.blocks.add(new Block());
  }
  return (Block) this.blocks.get(index);
}

-  When looking at your page, look at the source and confirm that your
indexed properties are named correctly.  You should see block[0].id,
block[0].name, block[0].category.

If none of this helps, I'm not sure where else to look.  It sounds like
everything else is lining up...

Nick




                                                                                         
                                             
                      "atta-ur rehman"                                                   
                                             
                      <attar@numetrics.        To:       "Struts Users Mailing List" <struts-user@jakarta.apache.org>
                 
                      com>                     cc:                                    
                                                
                                               Subject:  Re: Indexed Properties          
                                             
                      07/29/2003 12:57                                                   
                                             
                      PM                                                                 
                                             
                      Please respond to                                                  
                                             
                      "Struts Users                                                      
                                             
                      Mailing List"                                                      
                                             
                                                                                         
                                             
                                                                                         
                                             




Hello again Nick.

Well i've come a step forward in that i've been able to successfully show
the jsp page using index="true" for all the rows and submit the form
without
any errors too:

<logic:iterate name="theForm" property="blocks" id="block"
type="test.Block">
   <tr>
    <td align="center">
     <html:text property="id" name="block" indexed="true" />
    </td>
    <td>
     <html:text property="name" name="block" indexed="true" />
    </td>
    <td>
     <html:select property="category" name="block" indexed="true">
      <html:options collection="optionList" property="value"
labelProperty="label"/>
     </html:select>
    </td>
   </tr>
  </logic:iterate>

works like a charm!

What i'm still missing what is updated when i submit the form? where can i
get updated values from? my ActionForm has list attirbute called "blocks"
each element in the list is a Block bean object. The Block bean has
getter/setters for id, name and category.

In ActionForm I also included setCategory(int) and getCategory(int, string)
which doesn't seem to be called at all!

something obvious that i'm missing?

Thanks.

ATTA


----- Original Message -----
From: "Nicholas L Mohler" <Nicholas_L_Mohler@raytheon.com>
To: "Struts Users Mailing List" <struts-user@jakarta.apache.org>
Sent: Tuesday, July 29, 2003 2:57 AM
Subject: Re: Indexed Properties


>
>
>
>
>
> Atta,
>
> It sounds to me like you have it.  As long as your names match up, it
> should work fine.  Ajay has given a full code example that looks good.
>
> Nick
>
>
>
>
>                       "atta-ur rehman"
>                       <attar@numetrics.        To:       "Struts Users
Mailing List" <struts-user@jakarta.apache.org>
>                       com>                     cc:
>                                                Subject:  Re: Indexed
Properties
>                       07/28/2003 08:44
>                       PM
>                       Please respond to
>                       "Struts Users
>                       Mailing List"
>
>
>
>
>
>
> Yes, I currently have two independent String arrays for blockName and
> blockType. Putting them, and all the other block related properties, is
> what
> seems to be the right thing to do! So you have confirmed.
>
> here is what i have understood from your text:
>
> 1) my form would have "blocks" property that would be a collection of
Block
> beans
> 2) iterating each block in the blocks collection i can sure display each
> block with "indexed=true" directive for text boxes and dropdowns.
> 3) now for the submission part i'd need to have setBlockType(int, string)
> and getBlockType(int) and same for the rest of properties. The name of
> property in the Block Form and name of the property in the Block Bean
must
> match.
> 4) and it should work?
>
> I've had my head stuck in my computer whole day today and i'm barely able
> to
> write this email :) Tommorrow morning i'd come back and confirm it by
> running it. meanwhile I'd appreciate if you could confirm these 4 points
> i've noted above!
>
> Thankyou very much for your help. It really did help.
>
> Regards,
>
> ATTA
>
>
> ----- Original Message -----
> From: "Nick" <nmohler@adelphia.net>
> To: "'Struts Users Mailing List'" <struts-user@jakarta.apache.org>
> Sent: Monday, July 28, 2003 5:08 PM
> Subject: RE: Indexed Properties
>
>
> > Hi Atta,
> >
> > No problem with the assistance.  Just hope that I can be helpful :-)
In
> > the cases where I use indexed properties, the property is part of a
> > larger object.  It sounds to me like you have two arrays in your form
> > class: one for blockName and one for blockType.  I would suggest
> > creating a bean with the two properties, and then have a collection of
> > those objects in your form.
> >
> > Building on my previous example, you'd have something like this:
> >  <logic:iterate name="blocks" id="oneBlock"
> >          type="com.myco.beans.Block">
> >      <td>
> >        <html:text name="oneBlock" property="blockName" indexed
="true"/>
> >      </td>
> >      <td>
> >        <html:select name="oneBlock" property="blockType"
> >                     indexed="true" size="1">
> >           <html:options name="myForm" property="blockTypes"/>
> >        </html:select.
> >      </td>
> >  </logic:iterate>
> >
> > This example assumes your collection of blockTypes is part of your
form,
> > but it could be a collection that was in request/session/application
> > scope.  You would create form entries for the collection like you
> > implemented in our previous emails.
> >
> > I have almost this exact code in a few places and it works well.
> >
> > Hope this helps.
> > Nick
> >
> > -----Original Message-----
> > From: atta-ur rehman [mailto:attar@numetrics.com]
> > Sent: Monday, July 28, 2003 3:37 PM
> > To: Struts Users Mailing List
> > Subject: Re: Indexed Properties
> >
> > Thanks, for the reply.
> >
> > Okay, here is the background. I'm trying to learn the user of Indexed
> > Properties. Why I'm doing that? Well, I have a form that lists, let's
> > say
> > for the sake of simplicity, Block Name and Block Type columns. Block
> > Name is
> > a readonly text field while the Block Type is a dropdown list box with
a
> > set
> > of reference values  coming from the database. User can have n blocks
on
> > the
> > page and he can change the block type of any block on the page. user
> > cannot
> > define a new block on this page.
> >
> > In my form I've got String[] getter/setters for blockName and blockType
> > properties. In my action, I set both these arrays reading from the
> > database.
> > Block Names show allright, but the block type dropdown, that is using
> > html:select tag, shows same type for all the blocks irrespective of the
> > type
> > of the block read from database.
> >
> > Now a few days back i asked a question on this forum regarding how to
> > have
> > my dropdowns display the right block type as set in the blockType
> > String[]
> > property of the form. Someone, I think it was Wendy Smoak, and i've
seen
> > quite a lot of helpful mails from him, mentioned that Indexed
Properties
> > might be the way go. Althogh, he also mentioned that he hasn't used
> > them.
> >
> > I solved the problem by using "value" property of html:select tag. the
> > doc
> > says that "value" property denotes the value of the listbox that would
> > be
> > used to select an item in the list. so far so good.
> >
> > now the kind of guy i'm, i thought why not try it thrue index
properties
> > and
> > learn something new ;) so i set out to learn indexed properties. read
> > some
> > articles and still i'm not sure what i'm missing.
> >
> > Hope this gives you the background and thanks once more for taking some
> > out
> > to hlep me.
> >
> > ATTA
> >
> > ----- Original Message -----
> > From: "Nicholas L Mohler" <Nicholas_L_Mohler@raytheon.com>
> > To: "Struts Users Mailing List" <struts-user@jakarta.apache.org>
> > Sent: Monday, July 28, 2003 1:09 PM
> > Subject: Re: Indexed Properties
> >
> >
> > >
> > >
> > >
> > >
> > >
> > > Atta,
> > >
> > > The complaint you are getting is because the property "fruit" is not
a
> > > property of the "oneF" bean.  That the oneF object is not a bean with
> > > properties will give you problems.  Depending on your goal, you need
> > to do
> > > something different.  What are you trying to do?
> > >
> > > I'm off work in a minute, but I'll check messages at home later this
> > > evening and see if I can help at all.
> > > Nick
> > >
> > >
> > >
> > >
> > >                       "atta-ur rehman"
> > >                       <attar@numetrics.        To:       "Struts
Users
> > Mailing List" <struts-user@jakarta.apache.org>
> > >                       com>                     cc:
> > >                                                Subject:  Re: Indexed
> > Properties
> > >                       07/28/2003 03:44
> > >                       PM
> > >                       Please respond to
> > >                       "Struts Users
> > >                       Mailing List"
> > >
> > >
> > >
> > >
> > >
> > >
> > > Thanks very much Nick! It was indeed helpful. I was missing
> > getter/setter
> > > for individual list items!
> > >
> > > now my form has following methods:
> > > private String[] fruit = {"Apple", "Orange", "Banana"};
> > >
> > > public List getFruits() {
> > >
> > > return Arrays.asList(this.fruit);
> > >
> > > }
> > >
> > > public void setFruits(List l) {
> > >
> > > this.fruit = (String[]) l.toArray();
> > >
> > > }
> > >
> > >
> > > public String getFruit(int index) {
> > >
> > > if (this.fruit == null) return "null";
> > >
> > > return this.fruit[index];
> > >
> > > }
> > >
> > > public void setFruit(int index, String f) {
> > >
> > > this.fruit[index] = f;
> > >
> > > }
> > >
> > > my JSP has following has this html:iterator:
> > >
> > > <logic:iterate name="theForm" property="fruits" id="oneF"
> > > type="java.lang.String" >
> > >    <tr>
> > >     <td align="center">
> > >      hi!
> > >     </td>
> > >     <td>
> > >      <html:text property="fruit" name="oneF" indexed="true" />
> > >     </td>
> > >    </tr>
> > >   </logic:iterate>
> > >
> > > and exception i get is this:
> > >
> > > javax.servlet.jsp.JspException: No getter method for property fruit
of
> > bean
> > > oneF
> > >              at
> > > org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:968)
> > >
> > >
> > > i think it has to do with the fact that my individual fruit is a
> > string
> > > object rather than being a bean in itself if some getter method(s)?
> > >
> > > can you see what's going wrong!
> > >
> > > Thanks again.
> > >
> > > ATTA
> > >
> > > ----- Original Message -----
> > > From: "Nicholas L Mohler" <Nicholas_L_Mohler@Raytheon.com>
> > > To: "Struts Users Mailing List" <struts-user@jakarta.apache.org>
> > > Sent: Monday, July 28, 2003 11:58 AM
> > > Subject: Re: Indexed Properties
> > >
> > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Atta,
> > > >
> > > > You can use indexed properties in your ActionForm class.  The key
is
> > > having
> > > > all of the correct methods in your form class.
> > > >
> > > > 1)  Getter and setter:  You need a get/Set method for the
collection
> > that
> > > > you refer to in your jsp.  for example:
> > > > public Collection getLocations()
> > > > public void setLocations(Collection locs)
> > > >
> > > > 2) Getter and setter for one instance in the collection.  The name
> > that
> > > you
> > > > use must match the name you define in your jsp as a single instance
> > from
> > > > the collection (specified as the id).  For example:
> > > >     <logic:iterate name="locations" id="oneLocation"
> > > >             type="com.myco.toolkits.beans.Location">
> > > >         <td>
> > > >             <html:text name="oneLocation" property="locationName"
> > indexed
> > > > ="true"/>
> > > >         </td>
> > > >         <td>
> > > >             <html:text name="oneLocation" property
="locationAddress"
> > > > indexed="true"/>
> > > >         </td>
> > > >     </logic:iterate>
> > > >
> > > > Your form should in this case have the following get/set methods:
> > > > public com.myco.toolkits.beans.Location getOneLocation(int index)
> > > > public void setOneLocation(int index,
> > com.myco.toolkits.beans.Location
> > > > oneLocation)
> > > >
> > > > Your code may never use either of the "oneLocation" methods, but
> > they
> > are
> > > > important for Struts.  When your page is submitted, your two
indexed
> > > > properties will be submitted as oneLocation[ix].locationName &
> > > > oneLocation[ix].locationAddress where ix is the index of the row
> > (0-10
> > > for
> > > > example).  As Struts proceses the indexed items, Struts will use
the
> > > > "getOneLocation" method to get the Collection instance for the
> > provided
> > > > index.  This method must resize the collection as needed and then
> > return
> > > > the object for the provided index.  For example, if your collection
> > has
> > > no
> > > > objects and the getter receives an index of 2, the method should
> > load
> > the
> > > > first three (0, 1, 2) collection locations with an initialized
> > object
> > and
> > > > return the third object.  Struts will then populate the appropriate
> > > > property in that object.
> > > >
> > > > As an aside, I tend to use the ArrayList object as my collection
> > type
> > > when
> > > > working with indexed properties, but I know that the Vector works
> > equally
> > > > well.  A simple array will work fine, but the logic to expand the
> > size
> > is
> > > a
> > > > little more involved.
> > > >
> > > > Let me know if this helps.
> > > > Nick
> > > >
> > > >
> > > >
> > > >
> > ---------------------------------------------------------------------
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