Implementing a Foreach

[Trussell David N <Da...@irs.gov>]

I'm fairly new to Java and even newer to Tapestry. I've searched the
archives, read (part of) "Tapestry In Action" and played around with the
example snippets in Tapestry->Doc->ComponentReference->Foreach. As much as I
hate to admit it, I'm lost. Any help would be appreciated. Our story thus
far:

User enters identifier and is identified as a "new user" then
cycle.activate("NewUser").

NewUser.html will contain a "@Foreach" component for each row returned from
the database. Just display at render time, nothing fancy, no tables, etc.

NewUser.page contains:

<page-specification class="ol5081.NewUser">
    <property-specification name="rulesList" type="java.util.ArrayList"
persistent="yes" />
    <property-specification name="rule" type="ol5081.sqlj.Rules" />
</page-specification>

"Rules.java" contains SQLJ code (not sure that's relevant) that populates
the ArrayList with rows returned from a query.

NewUser.java contains:

package ol5081;

import org.apache.tapestry.html.BasePage;
import java.util.*;

public abstract class NewUser extends BasePage {

	public abstract ArrayList getRulesList();

	public abstract ArrayList setRulesList(ArrayList value);
}

I've tried quite a few different approaches with rather ugly results.

Thank you all very much.

Dave

Re: Implementing a Foreach

[John Studarus <st...@jhlconsulting.com>]

  If I answer your question do I get a deduction on my taxes?
(Poster is from irs.gov)

  Give this is a try...

        John

NewUser.page:

<page-specification class="gov.irs.NewUserPage">

  <component id="rulesForeach" type="Foreach">
    <binding name="source" expression="rulesList"/>
    <binding name="value" expression="rule"/>
  </component>

  <component id="ruleName" type="Insert">
    <binding name="value" expression="rule.name"/>
  </component>

</page-specification>

 
package ol5081;

import org.apache.tapestry.html.BasePage;
import java.util.*;

public class NewUser extends BasePage {  // note - abstract removed

  // this is called at the beginning of the Foreach
  public ArrayList getRulesList() {
    // your SQL code is called here i.e. ol5081.sqlj.Rules
  }

  // you really don't need this
  // public ArrayList setRulesList(ArrayList value);


  private Rule _rule = null ;

  //  use this in an Insert to display the results of each loop
  public Rule getRule() {
    return _rule ;
  }

  // the setter is called by the Foreach with each iteration
  public void setRule(Rule rule) {
    _rule = rule ;
  }
}

  Your NewUser.html needs to have a Foreach (not a @Foreach).  @Foreach
creates a new instance and not the one spec'd in your .page file.

<SPAN jwcid="rulesForeach">
  <SPAN jwcid="ruleName">Some Rule Name</SPAN><BR/>
</SPAN>


On Mon, Mar 29, 2004 at 12:29:20PM -0600, Trussell David N wrote:
> I'm fairly new to Java and even newer to Tapestry. I've searched the
> archives, read (part of) "Tapestry In Action" and played around with the
> example snippets in Tapestry->Doc->ComponentReference->Foreach. As much as I
> hate to admit it, I'm lost. Any help would be appreciated. Our story thus
> far:
> 
> User enters identifier and is identified as a "new user" then
> cycle.activate("NewUser").
> 
> NewUser.html will contain a "@Foreach" component for each row returned from
> the database. Just display at render time, nothing fancy, no tables, etc.
> 
> NewUser.page contains:
> 
> <page-specification class="ol5081.NewUser">
>     <property-specification name="rulesList" type="java.util.ArrayList"
> persistent="yes" />
>     <property-specification name="rule" type="ol5081.sqlj.Rules" />
> </page-specification>
> 
> "Rules.java" contains SQLJ code (not sure that's relevant) that populates
> the ArrayList with rows returned from a query.
> 
> NewUser.java contains:
> 
> package ol5081;
> 
> import org.apache.tapestry.html.BasePage;
> import java.util.*;
> 
> public abstract class NewUser extends BasePage {
> 
> 	public abstract ArrayList getRulesList();
> 
> 	public abstract ArrayList setRulesList(ArrayList value);
> }
> 
> I've tried quite a few different approaches with rather ugly results.
> 
> Thank you all very much.
> 
> Dave

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