Re: validation of fields within a For component

Christian Dutaret Fri, 07 Jul 2006 03:50:22 -0700

Thanks a lot for your answer.

I actually figured out the behavior you explain here (after a shortnight sleep and a lot of debugging;-), and found a solution to my problem.What I actually do is force the component name to the appropriate clientID before I record my error. I do this in my custom validation delegate.

This is not very elegant (I have to use in my listener the same IDallocation algorithm than the form support, to make sure the client IDsare in sync), but it does the job.


Thx again
Ch.

Shing Hing Man a écrit :

When you use a component in a loop, only one instance
of it is used.
The problem is that in the java code of your page, you
can not, as you said,
 reference the second,say,  'component' in the loop.
Each 'copy' of the component in the loop can be
uniquely identified by
getClientId().

Example : .page
        
   <component id="loop" type="For">
        <binding name="source" value="ognl:entries"/>

<binding name="value" value="ognl:entry"/><binding name="index" value="myIndex"/></component>

<component id="inputTF" type="TextField"><binding name="value" value="ognl:entry" /></component>



.html,
  <span jwcid="loop">
           Entry : <input type="text" jwcid="inputTF"/>        <br>

   </span>

The generated html would be :

           Entry : <input type="text" name="inputTF" value=""
id="inputTF"/>      <br>

Entry : <input type="text" name="inputTF_0"

value="" id="inputTF_0"/>         <br>

Entry : <input type="text" name="inputTF_1"

value="" id="inputTF_1"/>         <br>


----------------
Note that the inputTF, inputTF_0, inputTF_1 are the
unique clientIds.

A possible solution is to use a custom delegate torecord the clientId of the component in error, in your

java code.

In the custom delegate, you have your own methodpublic void writeSuffix, to mark the fields in

error.
The following is an example to illustrate the above.
( But I have not put in the error message .)

Shing========================




public abstract class TestComponentInLoop extends
BasePage implements
                PageBeginRenderListener {

        @Bean(man.custom.MyDelegate.class)
        public abstract MyDelegate getDelegate();

        public abstract String[] getEntries();

        public abstract void setEntries(String[] str);

        public abstract int getMyIndex();

        public abstract void setMyIndex(int ent);

        public void formSubmit(IRequestCycle cycle) {
                // Mark the second inputTF in error             
                MyDelegate delegate = getDelegate();
                delegate.addClientsId("inputTF_0");
        }

        public String getEntry() {
                return getEntries()[getMyIndex()];
        }

        public void setEntry(String str) {
                getEntries()[getMyIndex()] = str;
        }

        public void pageBeginRender(PageEvent arg0) {
                if (getEntries() == null) {
                        String[] entries = new String[3];
                        setEntries(entries);
                }

        }

}

===============

.page :






 <?xml version="1.0"?>

<!DOCTYPE page-specification PUBLIC"-//Apache Software Foundation//TapestrySpecification 4.0//EN"

"http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd";>

        
<page-specification
class="man.pages.TestComponentInLoop" >

<description>

           Custom validation of a component in a loop

</description>

        
   <component id="loop" type="For">
        <binding name="source" value="ognl:entries"/>

<binding name="value" value="ognl:entry"/><binding name="index" value="myIndex"/></component>

<component id="inputTF" type="TextField"><binding name="value" value="ognl:entry" /></component>

</page-specification>

==============================

.html




<html>

<head>
  <title>TestComponentInLoop</title>
  <meta name="GENERATOR" content="Quanta Plus">
  <meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">
</head>
<body jwcid="@Body">
   <form jwcid="@Form" listener="listener:formSubmit"
delegate="ognl:delegate">
         <span jwcid="loop">
           Entry : <input type="text" jwcid="inputTF"/>        <br>

         </span>

      <input type="submit"/>
   </form>

</body>
</html>


--- Christian Dutaret <[EMAIL PROTECTED]>
wrote:

Hi,

I have a form which contains input fields (e.g.
PropertySelectioncomponents) within For loops.
I need to perform some custom validation, which
sometimes acts acrossseveral fields. I usually implement single-fieldvalidation throughvalidators, and cross-field validation in thelistener (this isnecessary because i cannot validate against otherfields if thecorresponding property value has not been set yet)
The problem I am facing with fields nested in loops
is that i do nothave access to the corresponding components (I needthe component topass to the validation delegate) throughgetComponent(id). Only the lastiteration component is available, the previous one
are gone.
Is there any way to retrieve all components within
the For loop?

I hope this is clear enough, not really easy to
explain...

Any help appreciated
Thx
Ch.

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Re: validation of fields within a For component

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