RE: Help still needed with valueChangeListener

Jeffrey Porter Wed, 26 Oct 2005 03:47:07 -0700

Thanks Stefan.

You response was a great help.

I’m still left with one question though.

I’ve been following the tutorial from the IBM website

(see http://www-128.ibm.com/developerworks/java/library/j-jsf2/index.html)

So I have a Manager class the references the bean.

The Manager class contains the method called by jsp onchange (keeping the logic away from the holding bean)

E.g.

<h:inputText

valueChangeListener="#{ncmManager.firstnameSelected}"

value="#{ncmManager.bean.firstname}"

immediate="true"

onchange="submit()"

<h:inputText immediate="true" id="surname" value="#{ncmManager.bean.surname}" required="true" />

public class NonConformingMaterialManager implements java.io.Serializable {

private Bean bean;

{

bean = new Bean(); // contains 2 fields firstname & surname + getter/setter methods

}

public void firstnameSelected(ValueChangeEvent vce) {

// do stuff

}

My question is this. How do I change other values in the page?

I want to change the value of surname based on what the firstname value is.

I can get the firstname value from the event.

The only code I can find to change the value of the surname field is…

UIInput input2 = (UIInput) ctxt.getViewRoot().findComponent("body").findComponent("_id0").findComponent("surname");

input2.setValue("newSurname");

If I have to do this, and can’t use the member variable (bean), then what is the point of having the “bean” in the manager class &

having the jsp tags use the attribute value="#{ncmManager.bean.firstname}" ????

If the firstnameSelected method was on the actual Bean class, then I could access the surname directly. Since my method is on a Manager class though, I can’t.

I hope that made some scene.

Thanks for any input on this.

Jeff

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 26 October 2005 09:38
To: [email protected]
Subject: RE: Help still needed with valueChangeListener

Jeff

Shouldn’t this

ctxt.getExternalContext().getSessionMap().put(“SHOWTHIS”, “partNumber”);

ctxt.getExternalContext().getSessionMap().put( “partNumber”, “SHOWTHIS”);

surely the component id is the key

You could use something like

<h:inputText id="partNumber"

value="#{nonConformingMaterial.partNumber}" required="true" immediate="true"

onchange="submit()"valueChangeListener=”#{nonConformingMaterial. processValueChange” />

so you would move

public void processValueChange(ValueChangeEvent vce) throws AbortProcessingException {

into your backing bean class

and then your code would have direct access to the getter/setter methods

getPartNumber() & setPartNumber()

so your code could

public void processValueChange(ValueChangeEvent vce) throws AbortProcessingException {

String partNo = ((String)vce.getNewValue());

System.out.println("A value has changed!" + partNo);

setPartNumber(partNo);

FacesContext ctxt = FacesContext.getCurrentInstance();

ctxt.renderResponse();

}

The doesn’t fire until the component loses focus

If this is NOT OK then you should consider using

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From: Jeffrey Porter [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 25, 2005 4:04 PM
To: MyFaces Discussion
Subject: Help still needed with valueChangeListener

I have the code that calls my ValueChangeListener implementation.

That part works, the bit I’m having trouble with is setting the new a value on page.

JSP…

<h:inputText

id="partNumber"

value="#{nonConformingMaterial.partNumber}"

required="true"

immediate="true"

onchange="submit()"

<f:valueChangeListener type="org.me.jsf.actions.NonConformingMaterialAL"/>

</h:inputText>

The code I have is…

CODE…

public class NonConformingMaterialAL implements ValueChangeListener {

public void processValueChange(ValueChangeEvent vce) throws AbortProcessingException {

String partNo = ((String)vce.getNewValue());

System.out.println("A value has changed!" + partNo);

// This doesn’t save & show the new value.?!??!

FacesContext ctxt = FacesContext.getCurrentInstance();

if (null != vce.getNewValue()) {

ctxt.getExternalContext().getSessionMap().put(“SHOWTHIS”, “partNumber”);

}

ctxt.renderResponse();

}

This doesn’t set the value “SHOWTHIS” in the field though.

Can someone please help?

Thanks

Jeff.

RE: Help still needed with valueChangeListener

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