Re: setting a collection in my form bean using iterate or forEach

[Lynn Stevens]

Hi Rick,
Read your email (thanks again) and tried what you said:
I got a the following error:
org.apache.jasper.JasperException: An error occurred while evaluating custom 
action attribute "items" with value "${PrintSessionFormBean.slideLots}": 
Unable to find a value for "slideLots" in object of class 
"org.pfgrc.struts.maple.man.PrintSessionActionForm" using operator "." 
(null)

so then I tried pre-defining slideLots as so:
<bean:define id="theSlideLots" type="java.lang.String[]" 
name="PrintSessionFormBean" property="slideLots"/>

      <c:forEach items="${theSlideLots}" var="lot">
          <tr><td><b>Lot</b></td></tr>
          <tr><td>Enter lot number:<br /><html:text property="theSlideLots" 
value="${lot}"/></td></tr>
          <tr><td>&nbsp</td></tr>
          <tr><td nowrap>Scan slides for lot:</td></tr>
          <tr><td><html:textarea property="slideBarCodes" rows="15" 
cols="29"/></td></tr>
     </c:forEach>

which did not produce and error, but set the value in the text fields to be 
literally ${lot}

Any suggestions?
The jsp:
<c:forEach items="${PrintSessionFormBean.slideLots}" var="lot">
          <tr><td><b>Lot</b></td></tr>
          <tr><td>Enter lot number:<br /><html:text property="slideLots"  
value="${lot}"/></td></tr>
          <tr><td>&nbsp</td></tr>
          <tr><td nowrap>Scan slides for lot:</td></tr>
          <tr><td><html:textarea property="slideBarCodes" rows="15" 
cols="29"/></td></tr>
     </c:forEach>

The DynaActionForm (its been subclassed to add a reset method):
<form-bean name="PrintSessionFormBean"
      type="org.pfgrc.struts.maple.man.PrintSessionActionForm"
      dynamic="true">
      <form-property name="sessionID" type="java.lang.Integer"/>
      <form-property name="slideTypeID" type="java.lang.Integer"/>
      <form-property name="slideTypeName" type="java.lang.String"/>
      <form-property name="slideTypeDesc" type="java.lang.String"/>
      <form-property name="num_plates" type="java.lang.Integer"/>
      <form-property name="plates" type="java.util.ArrayList"/>
      <form-property name="num_entered_plates" type="java.lang.Integer"/>
      <form-property name="entered_plates" type="java.util.ArrayList"/>
      <form-property name="machineID" type="java.lang.Integer"/>
      <form-property name="machineName" type="java.lang.String"/>
      <form-property name="machineDesc" type="java.lang.String"/>
      <form-property name="num_slides" type="java.lang.Integer"/>
      <form-property name="slides" type="java.util.ArrayList"/>
      <form-property name="num_plate_barcodes" type="java.lang.Integer"/>
      <form-property name="plateBarCodes" type="java.lang.String"/>
      <form-property name="slideBarCodes" type="java.lang.String"/>
      <form-property name="entered_slides" type="java.util.ArrayList"/>
      <form-property name="completed" type="java.lang.String"/>
      <form-property name="arborID" type="java.lang.Integer"/>
      <form-property name="fileName" type="java.lang.String"/>
      <form-property name="numActualPlates" type="java.lang.Integer"/>
      <form-property name="slideNo" type="java.lang.Integer"/>
      <form-property name="dateCreated" type="java.lang.String"/>
      <form-property name="operator" type="java.lang.String"/>
      <form-property name="penID" type="java.lang.String"/>
      <form-property name="printSessionName" type="java.lang.String"/>
      <form-property name="crosslinked" type="java.lang.Boolean"/>
      <form-property name="numSlideLots" type="java.lang.Integer" 
initial="0"/>
      <form-property name="slideLots" type="java.lang.String[]"/>
      <form-property name="slideGroups" type="java.lang.String[]"/>
  </form-bean>

Snipet from the Action:
for (int i = 0; i < numSlideLots.intValue(); i++)
      {
          mySlideLots[i] = "";
      }
      dvf.set("slideLots", mySlideLots);
      mySlideLots = (String[]) dvf.get("slideLots");
      for (int i = 0; i < mySlideLots.length; i++)
      {
      log.debug("lot " + i + ":"+ mySlideLots[i]);
      }

From: Rick Reumann <[EMAIL PROTECTED]>
Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
To: Struts Users Mailing List <[EMAIL PROTECTED]>
Subject: Re: setting a collection in my form bean using iterate or forEach
Date: Mon, 23 Aug 2004 00:48:58 -0400
Lynn Stevens wrote:
I think I see what you are saying, but in my case I am collecting 
information from the user that I have never seen before.  Don't know what 
they will enter into the field.  I mean, I could put default information 
in there like "Enter lot number here", but I have no idea what the lot 
number will be until they type it in...if you get what I mean....
Well you have to know at some point how many blank fields you want to 
display.. so just make sure you intialize your String[] with that size and 
then when you display the values they'll just be blank (which is what I 
think you want). I'm guessing the problem you are running into is you 
aren't intializing the size of the array to at least a number you are 
compfortable with.

I am trying to let the user enter information about a lot of slides that 
they are using, but they may be using several lots of slides and the 
number of lots will change every time they use the application...thus I 
want present a page that has a field for entering information for one 
lot...then I have a "add another lot" button that they can click that will 
allow them to enter the information for a second lot, but they should 
still be able to see the information they entered for the first lot, thus 
they will see two textfields...actually there are corresponding textareas 
for each textfield as well, but assuming I can get the textfield to work, 
I can follow suit with the textarea.  In fact, they should be able to keep 
clicking "add new lot" without filling anything out until the end if they 
like...
This should work fine, but I think you might want to use type ArrayList. It 
might get a bit tricky working with arrays for this. Actually I take that 
back, I think using a String[] should still be fine... when they click on 
the "add new" you'll just do...

<c:forEach items="${yourForm.slideInfo}" var="info">
   <html:text property="slideInfo" value="${info}"/>
</c:forEach>
<html:text property="slideInfo" value=""/>
I'm not 'exactly' sure how the above would work, and it would get a bit 
tricky if they submitted the form and didn't enter anything for the last 
value. What you'd have to do is check for that last index value and see it 
was empty and if it was you might want to remove it from the String[] 
(again, since you are going to be working with adding and removing stuff 
from an array, it might be easier working with the List APIs).

--
Rick
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